Publication date: 5th November 2025
Organometal halide perovskite (OMHP) is a promising material for the light-weight and high-efficiency solar cells. In fact, perovskite solar cells (PSCs) using OMHP have demonstrated remarkable advancements, where the power conversion efficiencies (PCEs) are exceeding 26%. In this lecture, current situation and future prospects of the high performance perovskite solar cells and modules are summarized. The composition of OMHP is recognised as one of the key factors in the improvement of the stability and efficiency. Many groups investigated mixed cation and mixed halogen perovskite absorber toward the high efficiency. For the improvement of the stability, K+-doped OMHP is good for keeping relatively high performance. The crystal lattice structure of the organometal halide perovskite is also important for both absorption and photophysics of them, whereas the micro-structural aspects within the simple organometal halide perovskite are still controversial issue. In our study, direct observation of the microstructure of the thin film organometal halide perovskite using transmission electron microscopy was investigated. In the case of “n-i-p” structural PSCs, FAPbI3 nanoparticles (NPs) were used for the making process of the FAPbI3 layer. The NPs improves the crystallinity, uniformity, and morphology of the bulk FAPbI3 perovskite films. The improved FAPbI3 layer lead to a reduction in charge recombination and a boost in charge transfer efficiency, enabling the optimized PSCs to achieve a remarkable peak power conversion efficiency (PCE) of 25.68 % with improved stability. In the case of “p-i-n” structural PSCs using defectless SAM, PCE reach to 25.93 % at the optimized condition.
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