Arezo Abdolhay, Alireza Kashaninia, Mehdi Banihashemi
The improvement of light trapping inside the active layer of perovskite solar cells (PSCs) was numerically investigated. The light absorption probability was improved by incorporating periodic arrays of mesoscopic electron-transporting layer into the absorber layer (CH3NH3PbI3) of the PSCs. Accordingly, chalcopyrite (CuInSe2) and bismuth selenide (Bi2Se3) were introduced in the form of hexagonal pillars with an optimum radius of 35 nm and a height of 292 nm. It was found that the proposed PSCs can significantly extend the broadband light absorption from the visible spectrum to the near-infrared (NIR) region compared to planar PSCs that have an identical active layer thickness. After optimization, the PSCs based on MP-CuInSe2 and MP-Bi2Se3 showed the best performance with an enhancement of respectively 32% and 54 % in the photocurrent density, (with values of 29.94 and 34.93 mA.cm−2), as compared to the planar PSC (with a photocurrent density of 22.69 mA.cm−2). This enhancement resulted from a more effective carrier transport due to the mesoscopic structures.
{"title":"Nanopillar arrays of mesoporous Bi2Se3 and CuInSe2 in layer-based perovskite solar cells","authors":"Arezo Abdolhay, Alireza Kashaninia, Mehdi Banihashemi","doi":"10.1049/ote2.12089","DOIUrl":"10.1049/ote2.12089","url":null,"abstract":"<p>The improvement of light trapping inside the active layer of perovskite solar cells (PSCs) was numerically investigated. The light absorption probability was improved by incorporating periodic arrays of mesoscopic electron-transporting layer into the absorber layer (CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>) of the PSCs. Accordingly, chalcopyrite (CuInSe<sub>2</sub>) and bismuth selenide (Bi<sub>2</sub>Se<sub>3</sub>) were introduced in the form of hexagonal pillars with an optimum radius of 35 nm and a height of 292 nm. It was found that the proposed PSCs can significantly extend the broadband light absorption from the visible spectrum to the near-infrared (NIR) region compared to planar PSCs that have an identical active layer thickness. After optimization, the PSCs based on MP-CuInSe<sub>2</sub> and MP-Bi<sub>2</sub>Se<sub>3</sub> showed the best performance with an enhancement of respectively 32% and 54 % in the photocurrent density, (with values of 29.94 and 34.93 mA.cm<sup>−2</sup>), as compared to the planar PSC (with a photocurrent density of 22.69 mA.cm<sup>−2</sup>). This enhancement resulted from a more effective carrier transport due to the mesoscopic structures.</p>","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"17 2-3","pages":"61-69"},"PeriodicalIF":1.6,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41325772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hamed Masoumi, Masoud Johar, Alireza Salehiyan, Mohammad Javad Emadi
Downlink data transmission of multi-user indoor optical wireless communications and its corresponding fairness analysis is studied by the authors. It is assumed that access points (APs) may use infrared beam (IR-beam) laser or light emitting diodes (LEDs) for data transmissions. For the case of APs with IR-beams, since the bandwidth of the transmitted optical signal can be very large than that of the LED’s, a typical time-division multiple access (TDMA) scheme is utilised to serve multiple users and the respective achievable rates are derived. Then, for a general fairness-scheduling utility function with the capability of adjusting the degree of fairness known as α-proportional fairness, optimal time-sharing coefficients are analytically derived in closed-forms. To compare the performance of the IR-based communications for the LED-based APs, two non-cooperative and cooperative data transmission schemes are also studied and the corresponding achievable rates are presented based on the classical superposition coding. Finally, to compare the performance of the two types of APs, per user data rate of the proposed systems are compared through numerical results for different scenarios to highlight advantages and drawbacks of the two types of APs. Also, by considering the Jain's index as a fairness metric, the impact of the system parameters on the fairness is discussed through numerical results.
{"title":"Fairness analysis of indoor multi-user communications through steerable IR-beam","authors":"Hamed Masoumi, Masoud Johar, Alireza Salehiyan, Mohammad Javad Emadi","doi":"10.1049/ote2.12088","DOIUrl":"10.1049/ote2.12088","url":null,"abstract":"<p>Downlink data transmission of multi-user indoor optical wireless communications and its corresponding fairness analysis is studied by the authors. It is assumed that access points (APs) may use infrared beam (IR-beam) laser or light emitting diodes (LEDs) for data transmissions. For the case of APs with IR-beams, since the bandwidth of the transmitted optical signal can be very large than that of the LED’s, a typical time-division multiple access (TDMA) scheme is utilised to serve multiple users and the respective achievable rates are derived. Then, for a general fairness-scheduling utility function with the capability of adjusting the degree of fairness known as <i>α</i>-proportional fairness, optimal time-sharing coefficients are analytically derived in closed-forms. To compare the performance of the IR-based communications for the LED-based APs, two non-cooperative and cooperative data transmission schemes are also studied and the corresponding achievable rates are presented based on the classical superposition coding. Finally, to compare the performance of the two types of APs, per user data rate of the proposed systems are compared through numerical results for different scenarios to highlight advantages and drawbacks of the two types of APs. Also, by considering the Jain's index as a fairness metric, the impact of the system parameters on the fairness is discussed through numerical results.</p>","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"17 2-3","pages":"77-86"},"PeriodicalIF":1.6,"publicationDate":"2023-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12088","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42149797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The niobium diselenide saturable absorber with wide working bandwidth and excellent nonlinear
{"title":"1.5 μm Passively Q-Switched Fiber Laser Based on Niobium Diselenide","authors":"伟钦 郭","doi":"10.12677/oe.2023.131001","DOIUrl":"https://doi.org/10.12677/oe.2023.131001","url":null,"abstract":"The niobium diselenide saturable absorber with wide working bandwidth and excellent nonlinear","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"59 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73124500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Space-based infrared early warning satellites are the core capabilities for the strategic early warning, capable of detecting launch activities of ballistic targets all over the world. The United
{"title":"Analysis of the Operational Capabilities of America’s GEO Early Warning Satellites Based on STK","authors":"玉晓 王","doi":"10.12677/oe.2023.133009","DOIUrl":"https://doi.org/10.12677/oe.2023.133009","url":null,"abstract":"Space-based infrared early warning satellites are the core capabilities for the strategic early warning, capable of detecting launch activities of ballistic targets all over the world. The United","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"23 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74880562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tin selenide (SnSe) is a typical layered two-dimensional P-type semiconductor material. Because
{"title":"Progress in Preparation and Applications of SnSe Thin Films","authors":"钧策 施","doi":"10.12677/oe.2023.132007","DOIUrl":"https://doi.org/10.12677/oe.2023.132007","url":null,"abstract":"Tin selenide (SnSe) is a typical layered two-dimensional P-type semiconductor material. Because","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"67 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74913853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The measurement of the axial displacement of microspheres is easily disturbed by environmental
{"title":"The Reconstruction Centering Method to Improve the Signal-to-Noise Ratio of the Axial Displacement Measurement of Microspheres","authors":"熙英 原","doi":"10.12677/oe.2023.132006","DOIUrl":"https://doi.org/10.12677/oe.2023.132006","url":null,"abstract":"The measurement of the axial displacement of microspheres is easily disturbed by environmental","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"186 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80659482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, a theory of synthetic sawtooth optical lattice is presented and the band structure of cold atoms in sawtooth optical lattice with applied magnetic field is discussed by theoretical calculation. By comparing the
{"title":"Theory of Sawtooth Optical Lattice Synthesis and the Energy Band Structure of Cold Atomic Is Added with Magnetic Field","authors":"泽豪 周","doi":"10.12677/oe.2023.131002","DOIUrl":"https://doi.org/10.12677/oe.2023.131002","url":null,"abstract":"In this paper, a theory of synthetic sawtooth optical lattice is presented and the band structure of cold atoms in sawtooth optical lattice with applied magnetic field is discussed by theoretical calculation. By comparing the","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"52 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91161098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Preparation and Gas-Sensitive Properties of α-Fe2O3 Nano-Arrays Grown in Situ and Non-Situ","authors":"晓丽 贺","doi":"10.12677/oe.2023.131004","DOIUrl":"https://doi.org/10.12677/oe.2023.131004","url":null,"abstract":"","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"42 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76841954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, a micro LD end pumped Nd:YLF laser with narrow pulse is described. Using Cr:YAG crystal with transmit ability of 70% as passive Q-switched crystal, the pulsed optical output power of the 1047 nm fundamental is 150 μJ with a pump power of 5 W and a repetition frequency of
{"title":"Study on All Solid State Narrow Pulse 523.5 nm Micro Green Laser","authors":"权 李","doi":"10.12677/oe.2023.131005","DOIUrl":"https://doi.org/10.12677/oe.2023.131005","url":null,"abstract":"In this paper, a micro LD end pumped Nd:YLF laser with narrow pulse is described. Using Cr:YAG crystal with transmit ability of 70% as passive Q-switched crystal, the pulsed optical output power of the 1047 nm fundamental is 150 μJ with a pump power of 5 W and a repetition frequency of","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"8 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75223825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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