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1 April 2022 What limits the voltage of polycrystalline CdSeTe solar cells? Insights from spectrally resolved and quantitative photoluminescence
Arthur L. Onno, Carey L. Reich, Siming Li, Adam Danielson, William Weigand, Alexandra Bothwell, Sachit Grover, Jeff Bailey, Gang Xiong, Darius Kuciauskas, Walajabad Sampath, Zachary C. Holman
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Proceedings Volume PC11996, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XI; PC1199604 (2022) https://doi.org/10.1117/12.2612237
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
In this contribution, we use spectrally resolved and quantitative photoluminescence measurements to parse voltage losses in CdSeTe films and finished devices. We show that sub-bandgap features, in part due to arsenic doping, are responsible for a significant decrease in the thermodynamic voltage limit Voc,ideal. Nevertheless, thanks to excellent material quality and interface passivation, the internal voltage iVoc (i.e., quasi-Fermi-level splitting with QFLS=q×iVoc) of finished devices approaches 1000 mV, in agreement with the high minority-carrier lifetimes measured. The selectivity of the device, and in particular of the back hole contact, is thus the main limitation in these devices.
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Arthur L. Onno, Carey L. Reich, Siming Li, Adam Danielson, William Weigand, Alexandra Bothwell, Sachit Grover, Jeff Bailey, Gang Xiong, Darius Kuciauskas, Walajabad Sampath, and Zachary C. Holman "What limits the voltage of polycrystalline CdSeTe solar cells? Insights from spectrally resolved and quantitative photoluminescence", Proc. SPIE PC11996, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices XI, PC1199604 (1 April 2022); https://doi.org/10.1117/12.2612237
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KEYWORDS
Solar cells
Luminescence
Arsenic
Cadmium
Doping
Interfaces
Thermodynamics
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