Publication date: 17th February 2025
Achieving stable formamidinium-caesium lead perovskite solar cells under light and heat is one of the major challenges hindering the commercialization of perovskite solar cells (PSCs), while the mechanism of device degradation, especially at the interface, is unclear and concealed.[1] Herein, by utilizing a novel polymer and organic Benzothiophene molecule (BT) blend, we construct a phase-separation hole transport layer (HTL) designed to compare with polymer PTAA and self-assembled monolayer Me-4PACz. We revealed that the efficiency difference in fresh samples arises from the crystallinity and orientation of the near HTL perovskite region, which result in defects and non-radiative recombination. However, this fails to provide guidance on the degradation pathway when aging at open-circuit condition with heat. We found that the behaviour of charge percolating and dissipating under open-circuit conditions impacts the change in the space charge region at the buried interface and the generation of mobile ions, thereby contributing to the loss of short-circuit current after aging. Devices incorporating our BT phase-separation HTL retained 85% of initial MPP efficiency for over 1,500 hours under full-spectrum simulated sunlight at 85 degrees Celsius and Open-Circuit Conditions in ambient air with a relative humidity of 50 to 60% (ISOS-L-3), five times longer than other HTL alternatives. [2]
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