Pub Date : 2015-12-21DOI: 10.1109/SSLCHINA.2015.7360691
C. Qian, J. J. Fan, X. Fan, A. Chernyakov, G. Zhang
In this study, a spectral power distribution (SPD) based method is developed to analyze and predict reliability characteristics of Light Emitting Diode (LED) lamps, such as lumen and chromaticity maintenance lifetimes. Usually, an entire SPD of a LED lamp can be regarded as the superposition of an asymmetric blue with a phosphor converted spectrum, each of which can be fitted by an Asymmetric Gaussian (AGaussian) model. During the ageing process, the decomposed SPD model parameters extracted from the test data of a LED lamp are fitted further to an exponential degradation model. Then at any given time, the lumen maintenance φ and color coordinates u' and v' can be calculated by predicting the SPD of a LED lamp. In order to demonstrate the application of the proposed method, a batch of ten LED PAR20 lamps equipped with four phosphor converted white LEDs (pc-white LEDs) were aged at 25 °C for 4000 hours. And a statistical analysis was performed to calculate the median values (50 percentile) of φ and du'v' with both upper boundary (5 percentile) and lower boundary (95 percentile). The results show that most of the measured φ and du'v' can be enveloped within the lower boundary curves predicted by the proposed model. In addition, there is a good prediction result of the φ curves by using the proposed method and a published statistical method. At last, the comparison between lumen and chromaticity maintenance lifetime predictions shows that the luminous flux depreciation failure may be the primary concern than the color shift in the selected test samples.
{"title":"Lumen and chromaticity maintenance lifetime prediction for LED lamps using a spectral power distribution method","authors":"C. Qian, J. J. Fan, X. Fan, A. Chernyakov, G. Zhang","doi":"10.1109/SSLCHINA.2015.7360691","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360691","url":null,"abstract":"In this study, a spectral power distribution (SPD) based method is developed to analyze and predict reliability characteristics of Light Emitting Diode (LED) lamps, such as lumen and chromaticity maintenance lifetimes. Usually, an entire SPD of a LED lamp can be regarded as the superposition of an asymmetric blue with a phosphor converted spectrum, each of which can be fitted by an Asymmetric Gaussian (AGaussian) model. During the ageing process, the decomposed SPD model parameters extracted from the test data of a LED lamp are fitted further to an exponential degradation model. Then at any given time, the lumen maintenance φ and color coordinates u' and v' can be calculated by predicting the SPD of a LED lamp. In order to demonstrate the application of the proposed method, a batch of ten LED PAR20 lamps equipped with four phosphor converted white LEDs (pc-white LEDs) were aged at 25 °C for 4000 hours. And a statistical analysis was performed to calculate the median values (50 percentile) of φ and du'v' with both upper boundary (5 percentile) and lower boundary (95 percentile). The results show that most of the measured φ and du'v' can be enveloped within the lower boundary curves predicted by the proposed model. In addition, there is a good prediction result of the φ curves by using the proposed method and a published statistical method. At last, the comparison between lumen and chromaticity maintenance lifetime predictions shows that the luminous flux depreciation failure may be the primary concern than the color shift in the selected test samples.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134222629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/SSLCHINA.2015.7360693
Max Wagner, A. Herzog, H. Ganev, T. Khanh
In the LM 80 testing standard method the lumen maintenance [1] of light sources is measured during their lifetime. As long as the spectral behavior is not changing over time, there is no doubt in that method. Since the integral value of the luminous flux is weighted with the V(λ)-function, degradation in the red and blue parts of the spectrum are represented less than changes in green and yellow spectral ranges. For this purpose spectral bands and their ratio over lifetime are analyzed and compared to each other. Data of 14,000 hours are presented in this study. Aging curves of the luminous flux und optical power are compared and analyzed by the described methods. Extrapolation and accelerated lifetime tests are used to predict spectral changes and their characteristics.
{"title":"LED aging acceleration — An analysis from measuring and aging data of 14,000 hours LED degradation","authors":"Max Wagner, A. Herzog, H. Ganev, T. Khanh","doi":"10.1109/SSLCHINA.2015.7360693","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360693","url":null,"abstract":"In the LM 80 testing standard method the lumen maintenance [1] of light sources is measured during their lifetime. As long as the spectral behavior is not changing over time, there is no doubt in that method. Since the integral value of the luminous flux is weighted with the V(λ)-function, degradation in the red and blue parts of the spectrum are represented less than changes in green and yellow spectral ranges. For this purpose spectral bands and their ratio over lifetime are analyzed and compared to each other. Data of 14,000 hours are presented in this study. Aging curves of the luminous flux und optical power are compared and analyzed by the described methods. Extrapolation and accelerated lifetime tests are used to predict spectral changes and their characteristics.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114313370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/SSLCHINA.2015.7360685
P. Tanner, J. Han, S. Dimitrijev
Efficiency droop remains a significant problem to be overcome if the performance of LEDs for solid state lighting is to be improved. As more cost effective substrates such as silicon wafers are used on which to grow the LED active layers, the overall output efficiency and efficiency droop at high drive currents need to be monitored and better understood. This paper investigates the droop effect at elevated temperatures for an LED grown on silicon, compared with an LED grown on the more standard sapphire substrate. While the overall output efficiency decreases with increasing temperature, the efficiency droop is found to be relatively independent of temperature.
{"title":"Temperature independence of the droop effect in blue LED's grown on silicon substrates","authors":"P. Tanner, J. Han, S. Dimitrijev","doi":"10.1109/SSLCHINA.2015.7360685","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360685","url":null,"abstract":"Efficiency droop remains a significant problem to be overcome if the performance of LEDs for solid state lighting is to be improved. As more cost effective substrates such as silicon wafers are used on which to grow the LED active layers, the overall output efficiency and efficiency droop at high drive currents need to be monitored and better understood. This paper investigates the droop effect at elevated temperatures for an LED grown on silicon, compared with an LED grown on the more standard sapphire substrate. While the overall output efficiency decreases with increasing temperature, the efficiency droop is found to be relatively independent of temperature.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121997883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-21DOI: 10.1109/SSLCHINA.2015.7360695
Jiajia Fu, Haizhong Xie, H. Cao, Lixia Zhao, Xuejiao Sun, Baojun Sun, Junxi Wang, Jinmin Li
We have fabricated three types of high power LEDs with different circuit boards: Al2O3 ceramic board, epoxy PCB with Cu-deposited on the wall of holes and epoxy PCB with Cu-filled through holes. The different contribution of the package have been separated and investigated by using the derivative of temperature rise in the time domain and thermal transient method. The results show that although the thermal conductivity coefficient of epoxy PCB is much smaller than that of ceramic, PCB integrated with Cu can improve the heat-dissipation significantly and decrease the thermal resistance. In addition, this design can also improve the EQE droop effect.
{"title":"Comparative analysis of thermal and optical properties for the LEDs with different circuit boards","authors":"Jiajia Fu, Haizhong Xie, H. Cao, Lixia Zhao, Xuejiao Sun, Baojun Sun, Junxi Wang, Jinmin Li","doi":"10.1109/SSLCHINA.2015.7360695","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360695","url":null,"abstract":"We have fabricated three types of high power LEDs with different circuit boards: Al2O3 ceramic board, epoxy PCB with Cu-deposited on the wall of holes and epoxy PCB with Cu-filled through holes. The different contribution of the package have been separated and investigated by using the derivative of temperature rise in the time domain and thermal transient method. The results show that although the thermal conductivity coefficient of epoxy PCB is much smaller than that of ceramic, PCB integrated with Cu can improve the heat-dissipation significantly and decrease the thermal resistance. In addition, this design can also improve the EQE droop effect.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126346669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360692
G. Tao
A high product reliability means low failure rate. A low failure rate cannot be achieved without manufacturing reliability excellence. With a few concrete examples, this paper illustrates that reliability excellence in SSL manufacturing is needed and can be achieved.
{"title":"Reliability excellence in SSL manufacturing","authors":"G. Tao","doi":"10.1109/SSLCHINA.2015.7360692","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360692","url":null,"abstract":"A high product reliability means low failure rate. A low failure rate cannot be achieved without manufacturing reliability excellence. With a few concrete examples, this paper illustrates that reliability excellence in SSL manufacturing is needed and can be achieved.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115043246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360709
Lili Wang, Y. Tu, Lanlan Yang, Yanyan Chen
The impact of ambient illumination on visual fatigue while watching TV was investigated. The tested ambient illumination included 120Hz full modulated LED light source, normal fluorescent light source and dark environment. Visual fatigue was measured with subjective ratings (12 symptoms, considering general discomfort and eye fatigue) and ophthalmological parameters (CFF, NRA, PRA, NPA, NPC) both before and after watching television. Results showed that, generally, both subjective ratings and ophthalmological parameters indicated significant visual fatigue after watching TV. However, only subjective ratings reflected more visual fatigue under dark environment compared to the illuminated environment. The difference between LEDs and fluorescent lamps was not significant.
{"title":"The impact of ambient illumination on visual fatigue while watching TV","authors":"Lili Wang, Y. Tu, Lanlan Yang, Yanyan Chen","doi":"10.1109/SSLCHINA.2015.7360709","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360709","url":null,"abstract":"The impact of ambient illumination on visual fatigue while watching TV was investigated. The tested ambient illumination included 120Hz full modulated LED light source, normal fluorescent light source and dark environment. Visual fatigue was measured with subjective ratings (12 symptoms, considering general discomfort and eye fatigue) and ophthalmological parameters (CFF, NRA, PRA, NPA, NPC) both before and after watching television. Results showed that, generally, both subjective ratings and ophthalmological parameters indicated significant visual fatigue after watching TV. However, only subjective ratings reflected more visual fatigue under dark environment compared to the illuminated environment. The difference between LEDs and fluorescent lamps was not significant.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133726858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Due to the high Schottky barrier height, traditional AlGaN/GaN SBD always has large turn-on voltage. In this paper, a low turn-on voltage cascode AlGaN/GaN SBD Si realized. A commercial 60 V Si SBD and a high voltage AlGaN/GaN HEMT (>700 V) were used in the design. After co-packaged, the device shows a turn-on voltage with 0.26 V and the breakdown voltage can reach up to 800 V. The reversed recovery time of the cascode AlGaN/GaN SBD is about 37.8 nS, which almost the same with the 600 V commercial SiC SBD. Since the cascode AlGaN/GaN SBD has an obviously advantage on cost over SiC SBD, the results indicate that such a AlGaN/GaN SBD may come to provide a potential solution to some field of power management applications.
由于高肖特基势垒高度，传统的AlGaN/GaN SBD具有较大的导通电压。本文实现了一种低导通电压级联编码AlGaN/GaN SBD Si。设计中使用了商用60 V Si SBD和高压AlGaN/GaN HEMT (>700 V)。共封装后器件的导通电压为0.26 V，击穿电压最高可达800 V。级联编码AlGaN/GaN SBD的反向恢复时间约为37.8 nS，与600 V商用SiC SBD基本相同。由于级联码AlGaN/GaN SBD在成本上明显优于SiC SBD，因此结果表明，这种AlGaN/GaN SBD可能会为某些电源管理应用领域提供潜在的解决方案。
{"title":"Low turn-on voltage AlGaN/GaN SBD designed by cascode","authors":"Lifang Jia, Zhi He, Yanan Liang, Zhongchao Fan, Yun Zhang, Fuhua Yang, Junxi Wang","doi":"10.1109/SSLCHINA.2015.7360714","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360714","url":null,"abstract":"Due to the high Schottky barrier height, traditional AlGaN/GaN SBD always has large turn-on voltage. In this paper, a low turn-on voltage cascode AlGaN/GaN SBD Si realized. A commercial 60 V Si SBD and a high voltage AlGaN/GaN HEMT (>700 V) were used in the design. After co-packaged, the device shows a turn-on voltage with 0.26 V and the breakdown voltage can reach up to 800 V. The reversed recovery time of the cascode AlGaN/GaN SBD is about 37.8 nS, which almost the same with the 600 V commercial SiC SBD. Since the cascode AlGaN/GaN SBD has an obviously advantage on cost over SiC SBD, the results indicate that such a AlGaN/GaN SBD may come to provide a potential solution to some field of power management applications.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132511595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360704
Yanyan Li, Pingjuan Niu, Zhengxiao Su
LED light source module is developed according to the design of light distribution of RRGB chip based on the demand of plants for light, temperature and humidity. Several light source modules constitute LED array planar light source module. Monitoring and control of the system is realized through the combination of upper computer based on LabVIEW and controller. The controller conducts real-time detection on photon flux density (PFD) of red, green and blue bands, temperature and humidity and displays the detection information on the interface of upper computer. Pulse width modulation (PWM) signal is adjusted dynamically through the controller so as to make PFD value of plants under lighting remain constant, thus realizing intelligent fill lighting of the lighting system in combination with ambient light. Meanwhile, the system also realizes intelligent adjustment of temperature and humidity threshold range. This intelligent fill lighting system meets the requirement of plants for fill lighting environment and greatly saving energies through the setting of different PFD values and temperature and humidity ranges of red, green and blue bands by upper computer and the completion of environmental control by lower computer according to the setting based on different fill lighting demands of different plants or the same plant in different growth stages for PFD and light quality ratio.
{"title":"Design of greenhouse monitoring and control system based on LED lighting","authors":"Yanyan Li, Pingjuan Niu, Zhengxiao Su","doi":"10.1109/SSLCHINA.2015.7360704","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360704","url":null,"abstract":"LED light source module is developed according to the design of light distribution of RRGB chip based on the demand of plants for light, temperature and humidity. Several light source modules constitute LED array planar light source module. Monitoring and control of the system is realized through the combination of upper computer based on LabVIEW and controller. The controller conducts real-time detection on photon flux density (PFD) of red, green and blue bands, temperature and humidity and displays the detection information on the interface of upper computer. Pulse width modulation (PWM) signal is adjusted dynamically through the controller so as to make PFD value of plants under lighting remain constant, thus realizing intelligent fill lighting of the lighting system in combination with ambient light. Meanwhile, the system also realizes intelligent adjustment of temperature and humidity threshold range. This intelligent fill lighting system meets the requirement of plants for fill lighting environment and greatly saving energies through the setting of different PFD values and temperature and humidity ranges of red, green and blue bands by upper computer and the completion of environmental control by lower computer according to the setting based on different fill lighting demands of different plants or the same plant in different growth stages for PFD and light quality ratio.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"344 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115885367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360705
Yu Hu, M. Luo, Yang Yang
A psychophysical experiment was conducted to study lighting uniformity across a desk top and the wall as well. The data were used to evaluate three uniformity metrics. Four attributes were scaled including uniformity, comfort, brightness and contrast perceptions using a categorical judgment method. Twenty-one subjects were asked to rate the attributes under different degree of lighting uniformity. The results showed that using the ratio between minimum and average to evaluate the uniformity performed the best, and a ratio of between 0.80 and 0.90 were consistently to provide accepted comfort across the desk top. Also, the contrast of lighting is significantly negatively correlated with uniformity. In the same illuminance level, more uniform lights will make subjects feel more comfortable. And in the same uniformity level, brighter lights will also make subjects feel more comfortable. Different desk tops and different illuminance levels will not significant influence the uniformity perception.
{"title":"A study on lighting uniformity for LED smart lighting system","authors":"Yu Hu, M. Luo, Yang Yang","doi":"10.1109/SSLCHINA.2015.7360705","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360705","url":null,"abstract":"A psychophysical experiment was conducted to study lighting uniformity across a desk top and the wall as well. The data were used to evaluate three uniformity metrics. Four attributes were scaled including uniformity, comfort, brightness and contrast perceptions using a categorical judgment method. Twenty-one subjects were asked to rate the attributes under different degree of lighting uniformity. The results showed that using the ratio between minimum and average to evaluate the uniformity performed the best, and a ratio of between 0.80 and 0.90 were consistently to provide accepted comfort across the desk top. Also, the contrast of lighting is significantly negatively correlated with uniformity. In the same illuminance level, more uniform lights will make subjects feel more comfortable. And in the same uniformity level, brighter lights will also make subjects feel more comfortable. Different desk tops and different illuminance levels will not significant influence the uniformity perception.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"825 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117055651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-11-01DOI: 10.1109/SSLCHINA.2015.7360713
Zhe Cheng, Yun Zhang
In several decades, the world has witnessed various dramatic changes since applying of semiconductor. The performance requirements of semiconductor products are continue increasing while the technology is improving. In order to satisfy the requirements, the researches of new material and device structure is necessary. This paper shows a new structure of GaN HEMT. An AlGaN/GaN HEMT consists of AlGaN/GaN Heterojunction, drain electrode, source electrode and gate electrode. Though the researchers have reported a large number of HEMT structures since M. Asif Khan and his colleagues repot the first AlGaN/GaN HEMT in 1993, there is none of the structures, which three electrodes are in different surfaces of device. This paper describes a new structure called different-surface-gate structure, which drain and source electrodes are on the other surface while the gate electrode is on the top surface (AlGaN surface) of the device as normal HEMTs. This paper will establish two models by TCAD simulation software. One is the model of different-surface-gate AlGaN/GaN HEMT and the other one is normal structure AlGaN/GaN HEMT, which is the control model. After building the models, the compare of the models will show the saturation current of the different-surface-gate model is 120% as large as it of the other model.
{"title":"A new sturcture AlGaN/GaN HEMT","authors":"Zhe Cheng, Yun Zhang","doi":"10.1109/SSLCHINA.2015.7360713","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2015.7360713","url":null,"abstract":"In several decades, the world has witnessed various dramatic changes since applying of semiconductor. The performance requirements of semiconductor products are continue increasing while the technology is improving. In order to satisfy the requirements, the researches of new material and device structure is necessary. This paper shows a new structure of GaN HEMT. An AlGaN/GaN HEMT consists of AlGaN/GaN Heterojunction, drain electrode, source electrode and gate electrode. Though the researchers have reported a large number of HEMT structures since M. Asif Khan and his colleagues repot the first AlGaN/GaN HEMT in 1993, there is none of the structures, which three electrodes are in different surfaces of device. This paper describes a new structure called different-surface-gate structure, which drain and source electrodes are on the other surface while the gate electrode is on the top surface (AlGaN surface) of the device as normal HEMTs. This paper will establish two models by TCAD simulation software. One is the model of different-surface-gate AlGaN/GaN HEMT and the other one is normal structure AlGaN/GaN HEMT, which is the control model. After building the models, the compare of the models will show the saturation current of the different-surface-gate model is 120% as large as it of the other model.","PeriodicalId":331882,"journal":{"name":"2015 12th China International Forum on Solid State Lighting (SSLCHINA)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127570605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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