Zhou Huanping, Joule: Record Efficiency of 25.2%! High-Efficiency Perovskite Solar Cells (at −53°C)
Release Date:
2020-08-19 14:36
Source:
Mixed-halide perovskite solar cells have been found to hold potential applications beyond terrestrial use, owing to their unique advantages in cold environments. Unfortunately, the pioneering technology is limited in device efficiency, and the operational mechanisms at low temperatures remain poorly understood.
A joint research effort by Huanping Zhou of Peking University and several other institutions has revealed that the performance of perovskite solar cells based on (FA, MA, Cs)Pb(I,Br)3 is significantly enhanced over the temperature range of 290 to 180 K.
Notably, at 220 K, the device achieves a maximum efficiency of 25.2% (with a stabilized efficiency of 24.2%), which is higher than the certified efficiency of 23.3% (stabilized at 22.8%) at 300 K. The researchers propose that phase transitions and lattice distortions in the perovskite film during thermal cycling effectively activate the self-healing of intrinsic defects, thereby enhancing the open-circuit voltage from 1.153 to 1.229 V and ultimately improving the overall efficiency.
In addition, the unpackaged devices were tested in a simulated near-space environment, demonstrating their operational feasibility and stability in practical cryogenic applications.
Self-Elimination of Intrinsic Defects Improves the Low-Temperature Performance of Perovskite Photovoltaics, Joule, 2020.
DOI:10.1016/j.joule.2020.07.006
https://www.sciencedirect.com/science/article/abs/pii/S254243512030324X
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