Li‐Doping and Ag‐Alloying Interplay Shows the Pathway for Kesterite Solar Cells with Efficiency Over 14%
(2024) Advanced Functional Materials — Vol. 34, n° 42, p. 2404669 (2024)
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- Authors
Gong, Yuancai 
Jimenez‐Arguijo, Alex Medaille, Axel Gon Moser, Simon Scaffidi, Romain Saucedo, Edgardo
- Abstract
- Kesterite photovoltaic technologies are critical for the deployment of light-harvesting devices in buildings and products, enabling energy sustainable buildings, and households. The recent improvements in kesterite power conversion efficiencies have focused on improving solution-based precursors by improving the material phase purity, grain quality, and grain boundaries with many extrinsic doping and alloying agents (Ag, Cd, Ge…). The reported progress for solution-based precursors has been achieved due to a grain growth in more electronically intrinsic conditions. However, the kesterite device performance is dependent on the majority carrier density and sub-optimal carrier concentrations of 1014–1015 cm−3 have been consistently reported. Increasing the majority carrier density by one order of magnitude would increase the efficiency ceiling of kesterite solar cells, making the 20% target much more realistic. In this work, LiClO4 is introduced as a highly soluble and highly thermally stable Li precursor salt which leads to optimal (>1016 cm−3) carrier concentration without a significant impact in other relevant optoelectronic properties. The findings presented in this work demonstrate that the interplay between Li-doping and Ag-alloying enables a reproducible and statistically significant improvement in the device performance leading to efficiencies up to 14.1%.
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Citations
Gong, Y., Jimenez‐Arguijo, A., Medaille, A. G., Moser, S., Basak, A., Scaffidi, R., Carron, R., Flandre, D., Vermang, B., Giraldo, S., Xin, H., Perez‐Rodriguez, A., & Saucedo, E. (2024). Li‐Doping and Ag‐Alloying Interplay Shows the Pathway for Kesterite Solar Cells with Efficiency Over 14%. Advanced Functional Materials, 34(42), 2404669. https://doi.org/10.1002/adfm.202404669 (Original work published 2024)