论文标题
乙二胺的添加可改善性能并抑制混合壁的钙钛矿中的相位不稳定性
Ethylenediamine Addition Improves Performance and Suppresses Phase Instabilities in Mixed-Halide Perovskites
论文作者
论文摘要
我们表明，将乙二胺（EDA）添加到钙钛矿前体溶液中，改善了高电动器的设备性能和材料的稳定性和无甲基铵，无甲基铵，甲米氨基葡萄球菌铅卤化物perovskites perovskites fa1-xcsxpb（i1-ybry）3个单元格的感兴趣。使用光谱和高光谱显微镜，我们表明添加剂改善了膜的均匀性并抑制了在高Br钙钛矿配方中无处不在的相位不稳定性，从而产生在环境条件下保持100天的稳定膜。通过添加1 mol％EDA，我们展示了1.69 EV-GAP Perovskite单开关P-I-N设备，VOC为1.22 V，并且Champion的最大功率值跟踪的功率转换效率为18.8％，可与最佳报道的无甲基氨基无甲基铵无用的perovskites相当。使用核磁共振（NMR）光谱和X射线衍射技术，我们表明EDA在溶液中与FA+反应，迅速和定量形成咪唑啉阳离子。在结晶过程中，咪唑啉的存在驱动了改善的钙钛矿薄膜特性。
We show that adding ethylenediamine (EDA) to perovskite precursor solution improves the photovoltaic device performance and material stability of high-bromide-content, methylammonium-free, formamidinium cesium lead halide perovskites FA1-xCsxPb(I1-yBry)3 which are currently of interest for perovskite-on-Si tandem solar cells. Using spectroscopy and hyperspectral microscopy, we show that the additive improves film homogeneity and suppresses the phase instability that is ubiquitous in high-Br perovskite formulations, producing films that remain stable for over 100 days in ambient conditions. With the addition of 1 mol% EDA we demonstrate 1.69 eV-gap perovskite single-junction p-i-n devices with a VOC of 1.22 V, and a champion maximum power point tracked power conversion efficiency of 18.8%, comparable to the best reported methylammonium-free perovskites. Using nuclear magnetic resonance (NMR) spectroscopy and X-ray diffraction techniques, we show that EDA reacts with FA+ in solution, rapidly and quantitatively forming imidazolinium cations. It is the presence of imidazolinium during crystallization which drives the improved perovskite thin-film properties.
