Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Although the theoretical power conversion efficiency (PCE) limit for perovskite/perovskite/silicon triple-junction (3-J) solar cells is 49.4% while that for perovskite/silicon two-junction (2-J) cells is 45.1% 1,2 the highest certified PCE reported for perovskite/perovskite/silicon cells is only 27.1%, which is far lower than the 34.85% (Longi, NREL chart) of perovskite/silicon cells. Such low PCE of 3-J solar cells is considered to be rooted in the intrinsic phase instability and defects formed in the ultra-wide bandgap (1.9 - 2 eV) perovskite 3, including more than 50% of Br in a mixed iodide and bromide composition, required for the top cell. Perovskites with Br/I exceeding 30-40% suffer from compositional heterogeneity and light-induced phase separation, resulting in reduced PCE and instability during various device operation conditions. Therefore, the main challenge in such Br-rich wide bandgap perovskites is to obtain compositional homogeneity and phase stability under light. In this talk, I will share our recent findings on how morphology and compositional heterogeneity that stems from the fabrication process, additives and annealing process, affects the light-induced phase separation in a 1.9 eV perovskite. Varying photoluminescence lifetimes of carriers in the perovskite of slightly varying compositions and morphology, and the films that are employed in different architectures will be discussed in relation to the photo-instability, seen as fast or slow phase separation. For instance, it was observed that perovskite films with longer life time, which might be due to either inefficient carrier extraction by the charge extraction layers or bulk compositional heterogeneity, suffer from faster phase separation. A comparison of this phenomenon observed in isolated perovskite films and that are employed in solar cells will be shown to reveal the importance of layers that are in contact to perovskite. Besides, more interestingly, it seems that all type of compositional heterogeneity might not be detrimental. Some preliminary results pertaining to such inhomogeneity that likely slows down the separation will be also shared.
Authors would like to acknowledge NEDO, Japan for fincanical support for this project
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