Thin‐Film Solar Cells with InP Absorber Layers Directly Grown on Nonepitaxial Metal Substrates |
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| Authors: | Maxwell Zheng Hsin‐Ping Wang Carolin M Sutter‐Fella Corsin Battaglia Shaul Aloni Xufeng Wang James Moore Jeffrey W Beeman Mark Hettick Matin Amani Wei‐Tse Hsu Joel W Ager Peter Bermel Mark Lundstrom Jr‐Hau He Ali Javey |
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| Institution: | 1. Electrical Engineering and Computer Sciences Department, University of California, Berkeley, CA, USA;2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;3. Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;4. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, USA;5. Computer Electrical and Mathematical Sciences & Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia |
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| Abstract: | The design and performance of solar cells based on InP grown by the nonepitaxial thin‐film vapor–liquid–solid (TF‐VLS) growth technique is investigated. The cell structure consists of a Mo back contact, p‐InP absorber layer, n‐TiO2 electron selective contact, and indium tin oxide transparent top electrode. An ex situ p‐doping process for TF‐VLS grown InP is introduced. Properties of the cells such as optoelectronic uniformity and electrical behavior of grain boundaries are examined. The power conversion efficiency of first generation cells reaches 12.1% under simulated 1 sun illumination with open‐circuit voltage (VOC) of 692 mV, short‐circuit current (JSC) of 26.9 mA cm?2, and fill factor (FF) of 65%. The FF of the cell is limited by the series resistances in the device, including the top contact, which can be mitigated in the future through device optimization. The highest measured VOC under 1 sun is 692 mV, which approaches the optically implied VOC of ≈795 mV extracted from the luminescence yield of p‐InP. |
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| Keywords: | III– V semiconductors InP materials growth photovoltaic devices thin‐films |
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