Single-crystal perovskites offer a potential route to advancing the stability of advanced perovskite solar cells (PSCs ) beyond polycrystalline films. The latest progress in single crystal PSC (SC-PSC) mainly comes from methylammonium (MA) (such as FA0.6MA0.4PbI3) perovskite devices, whose power conversion efficiency (PCE ) reaches 23.1%. However, given the relative volatility of MA molecules within the perovskite structure , this perovskite is inherently susceptible to thermal stress.
King Abdullah University of Science and Technology (KAUST) Omar F. Mohammed, Osman M. Bakr et al. demonstrated MA-free SC-PSC based on a ~20 μm thick Cs0.05FA0.95PbI3 single crystal absorber layer, which enables SC-PSC A new benchmark for stability and efficiency. The device exhibited a PCE of 24.29% and retained 90% of its initial efficiency after 900 hours of operation at 53 °C.
Accelerated aging tests of Cs0.05FA0.95PbI3 single crystals show that they withstand damp heat testing (85 °C/65% RH) for approximately twice as long as polycrystalline films of the same composition. These results indicate that FAPbI3-based MA-free SCs are promising candidates to improve PSC stability and efficiency on the road to commercialization.
Muhammad Naufal Lintangpradipto, Hongwei Zhu, Bingyao Shao, Wasim J. Mir, Luis Gutiérrez-Arzaluz, Bekir Turedi, Mutalifu Abulikemu, Omar F. Mohammed*, and Osman M. Bakr*, Single-Crystal Methylammonium-Free Perovskite Solar Cells with Efficiencies Exceeding 24% and High Thermal Stability, ACS Energy Lett. 2023, 8, 4915–4922
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