Abstract

Organic-metal halide perovskite is one of the most promising candidates for the next generation solar cell material owing to its superior photo-electric properties and relatively simple fabrication process. In particular, FAPbI₃ turned out to be very suitable for efficient solar cell due to its low band gap energy (~1.5 eV). However, FAPbI₃ shows the crystal phase instability between unfavourable yellow trigonal δ-phase and perovskite-type black cubic α-phase at room temperature. To stabilize it, various additives such as MACl, Cs and MAPbBr₃ have been proposed and studied. Recently, there was a report that 0.8 mol% of MAPbBr₃ additive stabilizes the crystal phase of FAPbI₃, and subsequently, a photo conversion efficieny (PCE) of 25.2% was achieved [1]. However, the influence of MAPbBr₃ additives on charge carrier dynamics and its correlation with crystallinity is still unrevealed.

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