High-performance CH3NH3PbI3 inverted planar perovskite solar cells via ammonium halide additives

다국어 초록 (Multilingual Abstract)

Organic-inorganic hybrid perovskites have recently attracted substantial attention as a top candidate foruse as light-absorbing materials in high-efficiency, low-cost and solution-processable photovoltaicdevices owing to their excellent optoelectronic properties. Here, we fabricated inverted planar perovskitesolar cells by incorporating small amounts of ammonium halide NH4X (X = F, Cl, Br, I) additives into aCH3NH3PbI3 (MAPbI3) perovskite solution. A compact and uniform perovskite absorber layer with largeperovskite crystalline grains is realized by simply incorporating small amounts of additives and by usingan anti-solvent engineering technique to control the nucleation and crystal growth of perovskite. Theenlarged perovskite grain size with a reduced density of the grain boundaries and improved crystallinityresults in fewer charge carrier recombinations and a reduced defect density, leading to enhanced deviceefficiency (NH4F: 14.88

0.33%, NH4Cl: 16.63

0.21%, NH4Br: 16.64

0.35%, and NH4I: 17.28

0.15%)compared to that of a reference MAPbI3 device (Ref.: 12.95

0.48%) and greater device stability. Thissimple technique involving the introduction of small amounts of ammonium halide additives to regulatethe nucleation and crystal growth of perovskitefilms translates into highly reproducible enhanced deviceperformance.

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