Effect of the size of organic spacers on the crystallinity and carrier recombination in 2D/3D hybrid formamidinium perovskite solar cell
발표자
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초록
내용
For commerciallization of perovskite solar cell, suppression of defect density and long term stability are highly needed. Recent works proposed 2D perovskites can be mixed with 3D perovskites for defect passivation and superior stability. Here, we systematically investigated the effect of the size of organic spacers on the crystallnity and charge carrier recombination in 2D/3D hybrid perovskite. Even small amounts of organic spacers affected the rate of crystallization. The formation of black phase formamidnium perovskite was facilitated or suppressed depending on the size of organic spacer. Microstrain which evolved during crystallization was highly correlated with energetic disorder and carrier recombination. Finally we could obtain efficeint (PCE:20.5%) and low band gap (1.48 eV) 2D/3D hybrid formamidnium perovskite solar cell.