Publication date: 11th March 2026
Although stability of perovskite solar cells (PSCs) has improved remarkably in recent years, with several studies reporting 1000-2000 hours of stability [1,2] under continuous operation, we still see cases that suffer a significant reversible drop in performance. We believe this phenomenon is also observed by others. In general, we found that perovskite of same composition (FAPbI3) but different thickness shows a dramatic difference in the stability, with the thin (~400 nm) perovskite films showing way slower decay than the thick (~700 nm) films. The stability was also influenced by the annealing temperature (100oC or 150oC) which alters the preferred orientation in the FAPbI3 films. In all cases, photocarriers directly influence the performance decay, evident from the stability tested under light of different intensities. We understand that the main cause of such performance decay is unbalanced carrier extraction between holes and electrons, depending on the electron and hole extraction materials, that leads to screening of field in perovskite which, in turn, results in poor conduction of carriers in perovskite. Electron beam induced current (EBIC) measured on fresh and stressed devices showed weakening of built-in field (depletion zone) in the cells that were operated at maximum power point for several hours. Although it is believed that ion migration to contacts/interfaces generate an ion-induced field that screens the built-in field and thus slows down the carrier extraction causing the performance loss, elemental mapping on devices before and after continuous operation in our case do not show any clear evidence of ion migration causing such fast and reversible performance decay. Instead, such reversible degradation of performance was found to have a strong correlation with carrier density and conduction in perovskite, which depends on the process by which it is made. More details on how the processing condition affects the perovskite composition and its interfaces and eventually its stability will be discussed during the talk.
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