Pub Date : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300779
Srisuda Rojsatien, T. Walker, T. Nietzold, B. Lai, E. Colegrove, M. Stuckelberger, A. K. Kanakkithodi, M. Chan, M. Bertoni
For decades, copper has been introduced in CdTe devices to improve overall performance (open circuit voltage, fill factor, and series resistance). While multiple articles have reported on Cu-based defects, very little is known about how the local structure around the copper atom affects electrical performance. Using X-ray Absorption Near Edge Structure (XANES) coupled with X-ray microscopy we investigate good and poor performing region in Cu-doped CdTe devices. Our XANES coupled with theoretical standards by FEFF9 suggest that CU2Te phase and CuCdmay be responsible for the high electrical performance of the regions under study. This correlation of structure-performance at the nanoscale offers a unique framework to understand and tune processes with deep implications to the overall electrical performance of the solar cell.
{"title":"Cu-Local Structures and Their Relation with Nanoscale Electrical Performance in CdTe","authors":"Srisuda Rojsatien, T. Walker, T. Nietzold, B. Lai, E. Colegrove, M. Stuckelberger, A. K. Kanakkithodi, M. Chan, M. Bertoni","doi":"10.1109/PVSC45281.2020.9300779","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300779","url":null,"abstract":"For decades, copper has been introduced in CdTe devices to improve overall performance (open circuit voltage, fill factor, and series resistance). While multiple articles have reported on Cu-based defects, very little is known about how the local structure around the copper atom affects electrical performance. Using X-ray Absorption Near Edge Structure (XANES) coupled with X-ray microscopy we investigate good and poor performing region in Cu-doped CdTe devices. Our XANES coupled with theoretical standards by FEFF9 suggest that CU2Te phase and CuCdmay be responsible for the high electrical performance of the regions under study. This correlation of structure-performance at the nanoscale offers a unique framework to understand and tune processes with deep implications to the overall electrical performance of the solar cell.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91342996","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 : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300789
S. Ziyabari, Liang Du, S. Biswas
Accurate forecasting of solar irradiance plays an important role in the reliable grid integration of renewable energy. Forecasting of photovoltaic (PV) generation of solar sites is routinely studied in academia and industries, however spatio-temporal weather dependencies amongst regional plants are often ignored. It is intuitively expected that PV generation of neighboring solar plants are correlated and may show similar time-varying patterns. In this paper, we are investigating spatiotemporal correlation between solar sites which are at different geographical locations. We propose a hybrid deep learning model which is a combination of a residual network (ResNet) to learn different representations of data and long short-term memory (LSTM) to capture long temporal dependencies. We measure the performance of the proposed model relative to other deep learning models, such as a convolutional neural network (CNN) and long short-term memory (LSTM), ResNet, and ResNet/multilayer perceptron (MLP) using seventeen years of meteorological data from twelve different sites in Philadelphia. Our experiments show that the proposed architecture integrating special and temporal contexts provides superior performance in solar irradiance forecasting.
{"title":"A Spatio-temporal Hybrid Deep Learning Architecture for Short-term Solar Irradiance Forecasting","authors":"S. Ziyabari, Liang Du, S. Biswas","doi":"10.1109/PVSC45281.2020.9300789","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300789","url":null,"abstract":"Accurate forecasting of solar irradiance plays an important role in the reliable grid integration of renewable energy. Forecasting of photovoltaic (PV) generation of solar sites is routinely studied in academia and industries, however spatio-temporal weather dependencies amongst regional plants are often ignored. It is intuitively expected that PV generation of neighboring solar plants are correlated and may show similar time-varying patterns. In this paper, we are investigating spatiotemporal correlation between solar sites which are at different geographical locations. We propose a hybrid deep learning model which is a combination of a residual network (ResNet) to learn different representations of data and long short-term memory (LSTM) to capture long temporal dependencies. We measure the performance of the proposed model relative to other deep learning models, such as a convolutional neural network (CNN) and long short-term memory (LSTM), ResNet, and ResNet/multilayer perceptron (MLP) using seventeen years of meteorological data from twelve different sites in Philadelphia. Our experiments show that the proposed architecture integrating special and temporal contexts provides superior performance in solar irradiance forecasting.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76616762","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 : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300767
A. Jäger-Waldau, G. Kakoulaki, I. Kougias, N. Taylor
The first European Renewable Energy Directive had a time horizon from 2009 until 2020. The effects of this directive were the drafting of roadmaps describing how the Member States of the European Union planned to reach their respective renewable energy targets, while building confidence in investors to back the sector. Photovoltaic (PV) installations saw a significant and fast increase between 2009 and 2013, but this trend was followed by a period of market inactivity. What can we now expect from the follow-up RED-II Directive with a time horizon until 2030? The lessons learned during the past 10 years highlight that only solar PV and wind have the necessary market potential to allow the EU to reach its overall renewables target.
{"title":"The European Green Deal - What's in it for Photovoltaics?","authors":"A. Jäger-Waldau, G. Kakoulaki, I. Kougias, N. Taylor","doi":"10.1109/PVSC45281.2020.9300767","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300767","url":null,"abstract":"The first European Renewable Energy Directive had a time horizon from 2009 until 2020. The effects of this directive were the drafting of roadmaps describing how the Member States of the European Union planned to reach their respective renewable energy targets, while building confidence in investors to back the sector. Photovoltaic (PV) installations saw a significant and fast increase between 2009 and 2013, but this trend was followed by a period of market inactivity. What can we now expect from the follow-up RED-II Directive with a time horizon until 2030? The lessons learned during the past 10 years highlight that only solar PV and wind have the necessary market potential to allow the EU to reach its overall renewables target.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78256600","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 : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300974
Ganna Chistiakova, L. Korte
This work focuses on the investigation of Magnesium oxide (MgO) layers as passivating electron selective contact for silicon solar cells. It was observed that MgO layers produced by atomic layer deposition (ALD) do not provide good passivation by themselves on c-Si wafers. Therefore, an intermediate passivation layer was needed to maintain a high VOC in solar cells with MgO layers. In this work, i-aSi:H layers were considered as a passivating buffer layer. The low MgO deposition temperatures (< 200°C) ensured compatibility with i-aSi:H layers. We investigate the dependence of solar cell performance on MgO layer thickness and influence of the annealing on the device performance. Additionally, possible metallization schemes at the interface to the MgO layer are discussed.
{"title":"Implementation of ALD-grown MgO layers as electron-selective contact for silicon solar cells","authors":"Ganna Chistiakova, L. Korte","doi":"10.1109/PVSC45281.2020.9300974","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300974","url":null,"abstract":"This work focuses on the investigation of Magnesium oxide (MgO) layers as passivating electron selective contact for silicon solar cells. It was observed that MgO layers produced by atomic layer deposition (ALD) do not provide good passivation by themselves on c-Si wafers. Therefore, an intermediate passivation layer was needed to maintain a high VOC in solar cells with MgO layers. In this work, i-aSi:H layers were considered as a passivating buffer layer. The low MgO deposition temperatures (< 200°C) ensured compatibility with i-aSi:H layers. We investigate the dependence of solar cell performance on MgO layer thickness and influence of the annealing on the device performance. Additionally, possible metallization schemes at the interface to the MgO layer are discussed.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78406045","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 : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300462
G. Courtois, R. Kurstjens, Jinyoun Cho, K. Dessein, I. García, I. Rey‐Stolle, C. Algora, V. Depauw, C. Porret, R. Loo
Specific power is an important metric for solar arrays in the aerospace market. For High Altitude Pseudo Satellites (HAPS), solar cells specific powers above 1500 W/kg are targeted. The current standard technology for space applications, namely lattice matched triple junction solar cells grown on $145 mumathrm{m}$ thick germanium substrates, supplies the required efficiency but is not light enough. This paper will present the Ge-on-Ge engineered substrate concept as an approach that can be implemented to address the needed reduction in germanium substrate thickness. The lift-off of the top Ge foil from this Ge-on-Ge substrate will be demonstrated. Additionally, results of epitaxial growth of III-V layers onto Ge-on-Ge engineered substrates will be discussed.
比功率是太阳能电池阵列在航空航天市场上的一个重要指标。对于高空伪卫星(HAPS)，目标是太阳能电池比功率超过1500 W/kg。目前用于空间应用的标准技术，即在$145 mu maththrm {m}$厚的锗衬底上生长的晶格匹配三结太阳能电池，提供了所需的效率，但不够轻。本文将提出Ge-on-Ge工程衬底概念，作为一种可以实现的方法，以解决锗衬底厚度的必要减少。将演示顶部Ge箔从Ge-on-Ge衬底上升起的过程。此外，将讨论III-V层在Ge-on-Ge工程衬底上外延生长的结果。
{"title":"Development of germanium-on-germanium engineered substrates for III-V multijunction solar cells","authors":"G. Courtois, R. Kurstjens, Jinyoun Cho, K. Dessein, I. García, I. Rey‐Stolle, C. Algora, V. Depauw, C. Porret, R. Loo","doi":"10.1109/PVSC45281.2020.9300462","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300462","url":null,"abstract":"Specific power is an important metric for solar arrays in the aerospace market. For High Altitude Pseudo Satellites (HAPS), solar cells specific powers above 1500 W/kg are targeted. The current standard technology for space applications, namely lattice matched triple junction solar cells grown on $145 mumathrm{m}$ thick germanium substrates, supplies the required efficiency but is not light enough. This paper will present the Ge-on-Ge engineered substrate concept as an approach that can be implemented to address the needed reduction in germanium substrate thickness. The lift-off of the top Ge foil from this Ge-on-Ge substrate will be demonstrated. Additionally, results of epitaxial growth of III-V layers onto Ge-on-Ge engineered substrates will be discussed.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78546508","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 : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300759
En-Wen Chang, Jun-Yu Huang, Yuh‐Renn Wu
In this study, the traditional and inverted architecture MAPbI3-based solar cells were investigated and the hysteresis characteristics of Perovskite solar cells (PSCs) caused by ion migration effects were modeled. Different operation conditions with time dependent ion drift-diffusion model were modeled, which has shown a great relevance to the I-V hysteresis characteristics of PSCs. It is depending on (1) bias scan rate; (2) concentration of ion in MAPbI3 material, and (3) carrier lifetime of MAPbI3. Simulation results show that traditional architecture PSCs have larger hysteresis effects. And the difference of the traditional and inverted structures is due to the difference of built-in voltage inside the devices, which induces (I−) ion migration to transport layer and effect the depletion field.
{"title":"Analysis of the hysteresis effect in Perovskite solar cells for the traditional and inverted architectures","authors":"En-Wen Chang, Jun-Yu Huang, Yuh‐Renn Wu","doi":"10.1109/PVSC45281.2020.9300759","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300759","url":null,"abstract":"In this study, the traditional and inverted architecture MAPbI3-based solar cells were investigated and the hysteresis characteristics of Perovskite solar cells (PSCs) caused by ion migration effects were modeled. Different operation conditions with time dependent ion drift-diffusion model were modeled, which has shown a great relevance to the I-V hysteresis characteristics of PSCs. It is depending on (1) bias scan rate; (2) concentration of ion in MAPbI3 material, and (3) carrier lifetime of MAPbI3. Simulation results show that traditional architecture PSCs have larger hysteresis effects. And the difference of the traditional and inverted structures is due to the difference of built-in voltage inside the devices, which induces (I−) ion migration to transport layer and effect the depletion field.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75025491","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 : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300361
Toshiyuki Hamada, Shinnosuke Yoneda, I. Nanno, N. Ishikura, S. Oke, Masayuki Fujii
Lightning damage to a photovoltaic power generation system has been observed to cause the bypass diode (BPD) in a photovoltaic module to fail. If a BPD fails owing to a short circuit, the short-circuited current could then flow in a closed circuit consisting of the cell string and the BPD, and burnout could occur. In this study, an impulse current test was conducted by passing an impulse current through the metal frame of a photovoltaic module to reveal the effect of the induced current and voltage generated in the photovoltaic module on the BPDs.
{"title":"Effect on Bypass Diodes of Passing an Impulse Current through the Metal Frame of a Photovoltaic Module","authors":"Toshiyuki Hamada, Shinnosuke Yoneda, I. Nanno, N. Ishikura, S. Oke, Masayuki Fujii","doi":"10.1109/PVSC45281.2020.9300361","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300361","url":null,"abstract":"Lightning damage to a photovoltaic power generation system has been observed to cause the bypass diode (BPD) in a photovoltaic module to fail. If a BPD fails owing to a short circuit, the short-circuited current could then flow in a closed circuit consisting of the cell string and the BPD, and burnout could occur. In this study, an impulse current test was conducted by passing an impulse current through the metal frame of a photovoltaic module to reveal the effect of the induced current and voltage generated in the photovoltaic module on the BPDs.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75173637","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 : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300973
Yanqi Luo, Nengxu Li, Zehua Chen, Xiuxiu Niu, Rishi E. Kumar, Junke Jiang, Huifen Liu, Oi Chen, B. Lai, G. Brocks, Tao Shuxia, Huanping Zhou, D. Fenning
Improved understanding of the origins of instability during photovoltaic operation of perovskite solar cell materials must be established to overcome barriers to commercialization. In this study, we analyze the microscopic mechanisms of degradation in high-performing methylammonium free (FA0.9Cs0.1PbI3) perovskite solar cells (PSC) over 600 hours of operation under stressors inherent to PV operation, including heat, illumination, and a load while excluding atmospheric effects by testing in a water-and oxygen-free atmosphere. While the PSCs exhibit reasonable thermal stability, they show considerable performance loss under constant illumination or stable power output. Synchrotron-based nanoprobe X-ray fluorescence and X-ray beam induced current (XRF/XBIC) measurements reveal segregation of current-blocking Cs-rich phases during stress testing. The decrease in performance correlates with the resulting number density of the Cs-rich clusters, which varies by stress condition. These findings unveil cation-dependent instability in FA0.9Cs0.1PbI3 perovskites and provide a framework for understanding the energy landscape in alloy perovskites to guide the engineering of long-lived halide perovskite devices.
{"title":"The Impacts and Origins of A-site Instability in Formamidinium-Cesium Lead Iodide Perovskite Solar Cells Under Extended Operation","authors":"Yanqi Luo, Nengxu Li, Zehua Chen, Xiuxiu Niu, Rishi E. Kumar, Junke Jiang, Huifen Liu, Oi Chen, B. Lai, G. Brocks, Tao Shuxia, Huanping Zhou, D. Fenning","doi":"10.1109/PVSC45281.2020.9300973","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300973","url":null,"abstract":"Improved understanding of the origins of instability during photovoltaic operation of perovskite solar cell materials must be established to overcome barriers to commercialization. In this study, we analyze the microscopic mechanisms of degradation in high-performing methylammonium free (FA0.9Cs0.1PbI3) perovskite solar cells (PSC) over 600 hours of operation under stressors inherent to PV operation, including heat, illumination, and a load while excluding atmospheric effects by testing in a water-and oxygen-free atmosphere. While the PSCs exhibit reasonable thermal stability, they show considerable performance loss under constant illumination or stable power output. Synchrotron-based nanoprobe X-ray fluorescence and X-ray beam induced current (XRF/XBIC) measurements reveal segregation of current-blocking Cs-rich phases during stress testing. The decrease in performance correlates with the resulting number density of the Cs-rich clusters, which varies by stress condition. These findings unveil cation-dependent instability in FA0.9Cs0.1PbI3 perovskites and provide a framework for understanding the energy landscape in alloy perovskites to guide the engineering of long-lived halide perovskite devices.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75353979","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 : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300574
Karan Rane, Navni N. Verma, Ardeshir Contractor, N. Shiradkar
This study describes a methodology for Finite Element Analysis (FEA) based thermal modelling of a design of a Photovoltaic (PV)junction box (Jbox) for assessing its heat dissipation capability under test conditions prescribed in qualification standards IEC 62790 / IEC 61215. The effect of parameters such as wind speed, power dissipation in the diode and thermal conductivity of potting material on the diode junction temperature are explored. COMSOL Multiphysics was used for developing the geometry, defining physics and computing the temperature distributions. This model can be used for comparative thermal assessment of various Jbox designs pre-manufacturing and pre-certification for de-risking the new designs.
{"title":"Finite Element Analysis Model of a PV Junction Box for Thermal Assessment","authors":"Karan Rane, Navni N. Verma, Ardeshir Contractor, N. Shiradkar","doi":"10.1109/PVSC45281.2020.9300574","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300574","url":null,"abstract":"This study describes a methodology for Finite Element Analysis (FEA) based thermal modelling of a design of a Photovoltaic (PV)junction box (Jbox) for assessing its heat dissipation capability under test conditions prescribed in qualification standards IEC 62790 / IEC 61215. The effect of parameters such as wind speed, power dissipation in the diode and thermal conductivity of potting material on the diode junction temperature are explored. COMSOL Multiphysics was used for developing the geometry, defining physics and computing the temperature distributions. This model can be used for comparative thermal assessment of various Jbox designs pre-manufacturing and pre-certification for de-risking the new designs.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77934692","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 : 2020-06-14DOI: 10.1109/PVSC45281.2020.9300454
M. Nardone, Curtis Walkons, S. Paetel, T. Friedlmeier, K. Kweon, V. Lordi, S. Bansal
Nine types of CIGS cells were studied with permutations of sodium content, buffer type (CdS or Zn(O, S)), and post-deposition treatment (PDT) with KF, RbF, or oxidation. JV, QE, and CV measurements are presented for several cells of each type. KF PDT with CdS buffer resulted in the highest efficiency. Although Zn(O, S) buffer cells with typical sodium content had relatively low efficiency, RbF PDT significantly improved performance. Oxidation alone significantly increased the efficiency of sodium deficient cells with CdS buffer. Numerical modeling was conducted to connect device properties to the observed performance variations.
{"title":"CIGS Device Models with Variations of Buffer Layer, Alkali Content, and Oxidation","authors":"M. Nardone, Curtis Walkons, S. Paetel, T. Friedlmeier, K. Kweon, V. Lordi, S. Bansal","doi":"10.1109/PVSC45281.2020.9300454","DOIUrl":"https://doi.org/10.1109/PVSC45281.2020.9300454","url":null,"abstract":"Nine types of CIGS cells were studied with permutations of sodium content, buffer type (CdS or Zn(O, S)), and post-deposition treatment (PDT) with KF, RbF, or oxidation. JV, QE, and CV measurements are presented for several cells of each type. KF PDT with CdS buffer resulted in the highest efficiency. Although Zn(O, S) buffer cells with typical sodium content had relatively low efficiency, RbF PDT significantly improved performance. Oxidation alone significantly increased the efficiency of sodium deficient cells with CdS buffer. Numerical modeling was conducted to connect device properties to the observed performance variations.","PeriodicalId":6773,"journal":{"name":"2020 47th IEEE Photovoltaic Specialists Conference (PVSC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75579774","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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