Pub Date : 2019-06-01DOI: 10.1109/PVSC40753.2019.8981304
Yu-Ming Huang, C. Lin, Yu-Yun Cho, S. Hsu, Sheng-Feng Kao, Hsiang-Yun Shih, Ting-Yu Lee, Y. Kao, R. Horng, H. Kuo
In this work, we discuss the feasibility of two color photons for boosting up the short-circuit current and power conversion efficiency in tandem solar cell. One of them is by luminescent down-shifting (LDS) effect, and the other one is the infrared light emitting diode at 820nm. The CdZnSeS/ZnS quantum dots are used in this study. It can convert ultra-violet photons to visible ones which could be efficiently transformed into electron-hole pairs. The infrared-radiation LED can increase photo-generated carriers of the bottom GaAs solar cell. Finally, short-circuit current would significantly increase from 10.46 mA/cm2 to 13.81 mA/cm2, and power conversion efficiency increase from 19.89 to 25.22%. This result shows the possible double-LDS effect for solar cell enhancement in the future.
{"title":"Feasibility Study for Double Luminescent Down-shifting Effect in A Dual Junction Solar Cell","authors":"Yu-Ming Huang, C. Lin, Yu-Yun Cho, S. Hsu, Sheng-Feng Kao, Hsiang-Yun Shih, Ting-Yu Lee, Y. Kao, R. Horng, H. Kuo","doi":"10.1109/PVSC40753.2019.8981304","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8981304","url":null,"abstract":"In this work, we discuss the feasibility of two color photons for boosting up the short-circuit current and power conversion efficiency in tandem solar cell. One of them is by luminescent down-shifting (LDS) effect, and the other one is the infrared light emitting diode at 820nm. The CdZnSeS/ZnS quantum dots are used in this study. It can convert ultra-violet photons to visible ones which could be efficiently transformed into electron-hole pairs. The infrared-radiation LED can increase photo-generated carriers of the bottom GaAs solar cell. Finally, short-circuit current would significantly increase from 10.46 mA/cm2 to 13.81 mA/cm2, and power conversion efficiency increase from 19.89 to 25.22%. This result shows the possible double-LDS effect for solar cell enhancement in the future.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"55 1","pages":"2613-2615"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85793844","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 : 2019-06-01DOI: 10.1109/PVSC40753.2019.8980693
Manjunath Matam, Joseph Walters
This paper proposes to perform certain integrity checks and balances to omit the wrong data in the monitoring of a solar PV plant. Further, these checks and balances are segregated into three types: basic, specific, and pattern checks. The former is performed on the data collected from all the types of sensors. However, the second check is performed on the data collected from the specific instruments. These checks are specific to the site, instrument, parameter, etc. The third check verifies the shape of profiles between the data of different sections of the PV system. For the data-inclusion/deletion purpose, the parameters of PV plant are segregated into a triangle-hierarchy of highest-least priority. Some of the proposed checks are performed on the raw data collected from a grid-tied 271 kW PV plant and 6.4 kW test PV plant. The results have indeed identified some of the bad data and validated the proposed checks.
{"title":"Data-integrity Checks and Balances in Monitoring of a Solar PV System","authors":"Manjunath Matam, Joseph Walters","doi":"10.1109/PVSC40753.2019.8980693","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8980693","url":null,"abstract":"This paper proposes to perform certain integrity checks and balances to omit the wrong data in the monitoring of a solar PV plant. Further, these checks and balances are segregated into three types: basic, specific, and pattern checks. The former is performed on the data collected from all the types of sensors. However, the second check is performed on the data collected from the specific instruments. These checks are specific to the site, instrument, parameter, etc. The third check verifies the shape of profiles between the data of different sections of the PV system. For the data-inclusion/deletion purpose, the parameters of PV plant are segregated into a triangle-hierarchy of highest-least priority. Some of the proposed checks are performed on the raw data collected from a grid-tied 271 kW PV plant and 6.4 kW test PV plant. The results have indeed identified some of the bad data and validated the proposed checks.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"68 1","pages":"1276-1281"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85809212","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 : 2019-06-01DOI: 10.1109/PVSC40753.2019.8980463
P. Ndione, C. Osterwald, L. Ottoson, A. Gabor, D. Levi
Temperature and solar irradiance are among the most relevant parameters that affect the energy yield of photovoltaic cells and modules. A rise in the module temperature leads to a significant decrease in the open circuit voltage and a small increase in the short circuit current. Here we use a new tool to determine temperature coefficients as well as to assess power rating of multi c-Si, mono c-Si, CdTe, and CIGS-based PV modules in controlled indoor conditions per IEC 60891 and IEC 61853-1. We use the tool to explore how nonuniformities in module temperature affect the accuracy of the temperature coefficients.
{"title":"A New Approach to Indoor Characterization of PV Module Energy Yield Parameters","authors":"P. Ndione, C. Osterwald, L. Ottoson, A. Gabor, D. Levi","doi":"10.1109/PVSC40753.2019.8980463","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8980463","url":null,"abstract":"Temperature and solar irradiance are among the most relevant parameters that affect the energy yield of photovoltaic cells and modules. A rise in the module temperature leads to a significant decrease in the open circuit voltage and a small increase in the short circuit current. Here we use a new tool to determine temperature coefficients as well as to assess power rating of multi c-Si, mono c-Si, CdTe, and CIGS-based PV modules in controlled indoor conditions per IEC 60891 and IEC 61853-1. We use the tool to explore how nonuniformities in module temperature affect the accuracy of the temperature coefficients.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"31 1","pages":"0087-0090"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76758430","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 : 2019-06-01DOI: 10.1109/PVSC40753.2019.8981221
C. Jiang, H. Moutinho, B. To, C. Xiao, L. Simpson, M. Al‐Jassim
Photovoltaic (PV) energy yield loss due to solar module soiling has become increasingly important as solar module deployment is now at the hundreds of gigawatts scale and continues to grow rapidly. We have reported on direct measurements—using atomic force microscopy (AFM)—of strong electric-field-induced attraction and adhesion force (Fes) of dust particles onto solar panel that are 1 to 2 orders of magnitude stronger than the van der Waals and water capillary forces, corroborated by observing the increase in system voltage-induced soiling rate. Here, we report another characteristic of Fes on soiling—long lasting or slow decay after turning off the high voltage applied to solar panels. The Fes decay time varies in a wide time range of 1 to 10 hours, depending on two factors: 1) either/both the cell or/and particle were charged with high voltage before the voltages were turned off; and 2) how the cell was connected to the ground after the voltage was turned off—either connected through the power supply electronics, directly connected to the ground, or electrically floated. The Fes decay is understood in terms of 1) net electrical charge dissipations in both particle and cell, 2) thermal disordering of dipole polarization in the module glass dielectrics, and 3) charge redistribution by the electrostatic interaction of particle and module glass. This long-lasting Fes for hours can significantly affect the solar panel soiling after sunset, especially combined with water condensation.
{"title":"Decay of Electrostatic Force of Dust Particles on Photovoltaic Modules","authors":"C. Jiang, H. Moutinho, B. To, C. Xiao, L. Simpson, M. Al‐Jassim","doi":"10.1109/PVSC40753.2019.8981221","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8981221","url":null,"abstract":"Photovoltaic (PV) energy yield loss due to solar module soiling has become increasingly important as solar module deployment is now at the hundreds of gigawatts scale and continues to grow rapidly. We have reported on direct measurements—using atomic force microscopy (AFM)—of strong electric-field-induced attraction and adhesion force (Fes) of dust particles onto solar panel that are 1 to 2 orders of magnitude stronger than the van der Waals and water capillary forces, corroborated by observing the increase in system voltage-induced soiling rate. Here, we report another characteristic of Fes on soiling—long lasting or slow decay after turning off the high voltage applied to solar panels. The Fes decay time varies in a wide time range of 1 to 10 hours, depending on two factors: 1) either/both the cell or/and particle were charged with high voltage before the voltages were turned off; and 2) how the cell was connected to the ground after the voltage was turned off—either connected through the power supply electronics, directly connected to the ground, or electrically floated. The Fes decay is understood in terms of 1) net electrical charge dissipations in both particle and cell, 2) thermal disordering of dipole polarization in the module glass dielectrics, and 3) charge redistribution by the electrostatic interaction of particle and module glass. This long-lasting Fes for hours can significantly affect the solar panel soiling after sunset, especially combined with water condensation.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"27 1","pages":"3119-3123"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77113960","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 : 2019-06-01DOI: 10.1109/PVSC40753.2019.8980662
K. Passow, J. Falls, Kirby Hunt
Photovoltaic (PV) power plants are financed – and later evaluated – based on a modeled energy prediction. However, any unaccounted-for losses or other model inaccuracies may cause plants to underperform expectation, resulting in large sums of lost revenue for plant owners. For example, while tracking systems have the potential to increase plant energy significantly over fixed tilt designs, any deviation from the optimum tracking angle can create large additional losses. This work investigates two real world case studies where tracking errors resulted in significant lost generation. Further modeling work uses the new electrical shading and time series tracking input features in PlantPredict to demonstrate the range of potential losses under various tracker error scenarios for both CdTe and cSi technologies.
{"title":"Sensitivity of PV Plant Performance to Tracker Error","authors":"K. Passow, J. Falls, Kirby Hunt","doi":"10.1109/PVSC40753.2019.8980662","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8980662","url":null,"abstract":"Photovoltaic (PV) power plants are financed – and later evaluated – based on a modeled energy prediction. However, any unaccounted-for losses or other model inaccuracies may cause plants to underperform expectation, resulting in large sums of lost revenue for plant owners. For example, while tracking systems have the potential to increase plant energy significantly over fixed tilt designs, any deviation from the optimum tracking angle can create large additional losses. This work investigates two real world case studies where tracking errors resulted in significant lost generation. Further modeling work uses the new electrical shading and time series tracking input features in PlantPredict to demonstrate the range of potential losses under various tracker error scenarios for both CdTe and cSi technologies.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"60 1","pages":"0659-0662"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77177106","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 : 2019-06-01DOI: 10.1109/PVSC40753.2019.8980768
M. Raquibuzzaman, S. Dongaonkar, B. Ray
In this paper, we propose an analytical theory of the "knee" voltage (Vknee) in a partially shaded module with bypass diodes. We find that knee voltage depends on the module configuration and it is independent of the number of shaded cells protected by each bypass diode. In addition, we propose two independent solutions to increase the knee voltage, which will significantly reduce the disproportionate power loss under partial shading conditions. The first solution involves using solar cells with low reverse breakdown voltage and the second solution is based on placing low shunt resistance cells in shading prone areas of the module.
{"title":"Can Bad Solar Cells Make a PV Module More Efficient?","authors":"M. Raquibuzzaman, S. Dongaonkar, B. Ray","doi":"10.1109/PVSC40753.2019.8980768","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8980768","url":null,"abstract":"In this paper, we propose an analytical theory of the \"knee\" voltage (Vknee) in a partially shaded module with bypass diodes. We find that knee voltage depends on the module configuration and it is independent of the number of shaded cells protected by each bypass diode. In addition, we propose two independent solutions to increase the knee voltage, which will significantly reduce the disproportionate power loss under partial shading conditions. The first solution involves using solar cells with low reverse breakdown voltage and the second solution is based on placing low shunt resistance cells in shading prone areas of the module.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"55 1","pages":"0555-0557"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77195932","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 : 2019-06-01DOI: 10.1109/PVSC40753.2019.8980698
P. Balaji, W. Dauksher, S. Bowden, A. Augusto
Silicon heterojunction solar cells were manufactured on 40 µm thin substrates using standard industrial manufacturing processes. As the thickness of the substrates goes down, bulk Shockley-Read-Hall recombination is less dominant and surface recombination becomes the main loss mechanism at the maximum power point. In this paper we report our latest accomplishments on 40 µm thin silicon heterojunction solar cells. We have achieved implied open-circuit voltages >760 mV and surface saturation current densities < 2 fA/cm2. The best cell has an efficiency of 20.69%, with an open-circuit voltage of 736 mV, a short-circuit current density of 37.17 mA/cm2 and a fill factor of 75.6%. Replacing the thick ITO front layer with an SiO2/ITO bilayer led to a gain of 1.2 ± 0.2 mA/cm2 in current density.
{"title":"Flexible silicon heterojunction solar cells on 40 µm thin substrates","authors":"P. Balaji, W. Dauksher, S. Bowden, A. Augusto","doi":"10.1109/PVSC40753.2019.8980698","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8980698","url":null,"abstract":"Silicon heterojunction solar cells were manufactured on 40 µm thin substrates using standard industrial manufacturing processes. As the thickness of the substrates goes down, bulk Shockley-Read-Hall recombination is less dominant and surface recombination becomes the main loss mechanism at the maximum power point. In this paper we report our latest accomplishments on 40 µm thin silicon heterojunction solar cells. We have achieved implied open-circuit voltages >760 mV and surface saturation current densities < 2 fA/cm2. The best cell has an efficiency of 20.69%, with an open-circuit voltage of 736 mV, a short-circuit current density of 37.17 mA/cm2 and a fill factor of 75.6%. Replacing the thick ITO front layer with an SiO2/ITO bilayer led to a gain of 1.2 ± 0.2 mA/cm2 in current density.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"4 1","pages":"1089-1092"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82481467","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 : 2019-06-01DOI: 10.1109/PVSC40753.2019.8980640
C. Xiao, Changlei Wang, Chunsheng Jiang, Zhaoning Song, Yanfa Yan, M. Al‐Jassim
In this work, we developed operando Kelvin probe force microscopy (KPFM) to study the electrostatic potential distribution across perovskite cells under light and forward bias to gain a deeper understanding of device operation physics. As a case study, we selected perovskite cells with a SnO2-based electron-selective layer (ESL), which showed great potential for fabricating high-efficiency, hysteresis-free devices due to the deeper conduction band and higher electron mobility of SnO2. The as-made device showed a main junction at the perovskite/spiro interface. After light soaking and applying forward bias, the junction quality improved, possibly explained by filling trap states at the interfaces and by the perovskite absorber perhaps having a self-poling effect; the main junction is observed at the ESL/perovskite interface. The results are consistent with current-voltage measurements, device performance improves mainly with fill factor enhancement. The operando KPFM results should more closely reflect the real case during current density-voltage measurements or solar cell operation. The operando KPFM technique that we have developed can be a powerful tool to provide a deeper understanding of the device operation mechanism and to further optimize the device.
{"title":"Operando Microscopy Characterization of Perovskite Solar Cells","authors":"C. Xiao, Changlei Wang, Chunsheng Jiang, Zhaoning Song, Yanfa Yan, M. Al‐Jassim","doi":"10.1109/PVSC40753.2019.8980640","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8980640","url":null,"abstract":"In this work, we developed operando Kelvin probe force microscopy (KPFM) to study the electrostatic potential distribution across perovskite cells under light and forward bias to gain a deeper understanding of device operation physics. As a case study, we selected perovskite cells with a SnO2-based electron-selective layer (ESL), which showed great potential for fabricating high-efficiency, hysteresis-free devices due to the deeper conduction band and higher electron mobility of SnO2. The as-made device showed a main junction at the perovskite/spiro interface. After light soaking and applying forward bias, the junction quality improved, possibly explained by filling trap states at the interfaces and by the perovskite absorber perhaps having a self-poling effect; the main junction is observed at the ESL/perovskite interface. The results are consistent with current-voltage measurements, device performance improves mainly with fill factor enhancement. The operando KPFM results should more closely reflect the real case during current density-voltage measurements or solar cell operation. The operando KPFM technique that we have developed can be a powerful tool to provide a deeper understanding of the device operation mechanism and to further optimize the device.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"2006 1","pages":"0638-0641"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82574113","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 : 2019-06-01DOI: 10.1109/PVSC40753.2019.8980654
K. Araki, Kan‐Hua Lee, N. Hayashi, Kouki Ichihashi, Shutetsu Kanayama, Takuji Inohara, Yohei Morita, M. Takase, M. Yamaguchi
Micro CPV is a promising technology for reducing high-precision assembly cost while making use of the high efficiency of CPV. However, the requirement of the installation and tracking accuracy remains the same. A production method is often taken to manufacture small size modules with high accuracy, high homogeneity, low cost, and to compile them. There is a concern that the performance of the large-area panel may deteriorate due to accuracy in the assembly. A micro-Köhler concentrator optics was designed suitable to the micro CPV modules, and the designed acceptance angle (90 % power point) reached 1.8 degrees with the 500 x axially symmetrical (truncated to square) primary plano-convex lens.
{"title":"Design of the Micro-Köhler Concentrator Optics for CPV Application","authors":"K. Araki, Kan‐Hua Lee, N. Hayashi, Kouki Ichihashi, Shutetsu Kanayama, Takuji Inohara, Yohei Morita, M. Takase, M. Yamaguchi","doi":"10.1109/PVSC40753.2019.8980654","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8980654","url":null,"abstract":"Micro CPV is a promising technology for reducing high-precision assembly cost while making use of the high efficiency of CPV. However, the requirement of the installation and tracking accuracy remains the same. A production method is often taken to manufacture small size modules with high accuracy, high homogeneity, low cost, and to compile them. There is a concern that the performance of the large-area panel may deteriorate due to accuracy in the assembly. A micro-Köhler concentrator optics was designed suitable to the micro CPV modules, and the designed acceptance angle (90 % power point) reached 1.8 degrees with the 500 x axially symmetrical (truncated to square) primary plano-convex lens.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"57 74 1","pages":"0196-0201"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76193362","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 : 2019-06-01DOI: 10.1109/PVSC40753.2019.8980932
Jiadong Qian, M. Ernst, Nandi Wu, A. Blakers
Perovskite materials have emerged as promising candidates for high-efficiency silicon based tandem solar cells. Critically, the different degradation rates of perovskite and silicon cells can affect the lifetime performance of tandem modules. In this paper we design and conduct experiments to investigate the impact of electrical and optical degradation of perovskite cells. Experiment results indicate that degradation dominated by fill factor and current reduction can change the optical transmittance of the perovskite cells. The long-term module performance is then simulated accordingly. A maximum permissible perovskite cell degradation rate of 0.9%/year is calculated to meet the current industry warranty requirements, while a minimum required tandem cell efficiency of 28.7% is estimated for a two-terminal tandem module to be economically superior to a silicon module.
{"title":"Unravelling Optical and Electrical Degradation of Perovskite Solar Cells and Impact on Perovskite/Silicon Monolithic Tandem Modules","authors":"Jiadong Qian, M. Ernst, Nandi Wu, A. Blakers","doi":"10.1109/PVSC40753.2019.8980932","DOIUrl":"https://doi.org/10.1109/PVSC40753.2019.8980932","url":null,"abstract":"Perovskite materials have emerged as promising candidates for high-efficiency silicon based tandem solar cells. Critically, the different degradation rates of perovskite and silicon cells can affect the lifetime performance of tandem modules. In this paper we design and conduct experiments to investigate the impact of electrical and optical degradation of perovskite cells. Experiment results indicate that degradation dominated by fill factor and current reduction can change the optical transmittance of the perovskite cells. The long-term module performance is then simulated accordingly. A maximum permissible perovskite cell degradation rate of 0.9%/year is calculated to meet the current industry warranty requirements, while a minimum required tandem cell efficiency of 28.7% is estimated for a two-terminal tandem module to be economically superior to a silicon module.","PeriodicalId":6749,"journal":{"name":"2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)","volume":"1 1","pages":"1187-1190"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87616453","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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