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Unravelling the Improved Electronic and Structural Properties of Methylammonium Lead Iodide Deposited from Acetonitrile
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-10-05 00:00:00 , DOI: 10.1021/acs.chemmater.8b03084 Alexandra J. Ramadan 1 , Nakita K. Noel 2 , Sarah Fearn 3 , Neil Young 4 , Marc Walker 5 , Luke A. Rochford 6 , Henry J. Snaith 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-10-05 00:00:00 , DOI: 10.1021/acs.chemmater.8b03084 Alexandra J. Ramadan 1 , Nakita K. Noel 2 , Sarah Fearn 3 , Neil Young 4 , Marc Walker 5 , Luke A. Rochford 6 , Henry J. Snaith 1
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Perovskite-based photovoltaics are an emerging solar technology with lab scale device efficiencies of over 22 %, and significant steps are being made toward their commercialization. Conventionally high efficiency perovskite solar cells are formed from high boiling point, polar aprotic solvent solutions. Methylammonium lead iodide (CH3NH3PbI3) films can be made from a range of solvents and blends; however, the role the solvent system plays in determining the properties of the resulting perovskite films is poorly understood. Acetonitrile (ACN), in the presence of methylamine (MA), is a viable nontoxic solvent for fabrication of CH3NH3PbI3 photovoltaic devices with efficiencies >18 %. Herein we examine films prepared from ACN/MA and dimethylformamide (DMF) and scrutinize their physical and electronic properties using spectroscopy, scanning probe imaging, and ion scattering. Significant differences are observed in the chemistry and electronic structure of CH3NH3PbI3 films made with each solvent, ACN/MA produces films with superior properties resulting in more efficient photovoltaic devices. Here we present a holistic and complete understanding of a high performance perovskite material from an electronic, physical, and structural perspective and establish a robust toolkit with which to understand and optimize photovoltaic perovskites.
中文翻译：
揭示从乙腈中沉积的甲基铵碘化铅的改进的电子和结构性质
基于钙钛矿的光伏技术是一种新兴的太阳能技术，其实验室规模的设备效率超过22％，并且正朝着将其商业化迈出重要一步。常规上，高效钙钛矿太阳能电池是由高沸点，极性非质子溶剂溶液形成的。甲基铵碘化铅（CH 3 NH 3 PbI 3）膜可以由多种溶剂和混合物制成；然而，人们对溶剂体系在确定所得钙钛矿薄膜性能中所起的作用知之甚少。在甲胺（MA）存在下，乙腈（ACN）是一种可行的无毒溶剂，可用于制造CH 3 NH 3 PbI 3效率> 18％的光伏设备。本文中，我们检查了由ACN / MA和二甲基甲酰胺（DMF）制备的薄膜，并使用光谱学，扫描探针成像和离子散射技术检查了它们的物理和电子性能。在用每种溶剂制得的CH 3 NH 3 PbI 3薄膜的化学和电子结构中观察到了显着差异，ACN / MA生产出具有优异性能的薄膜，从而产生了更高效的光伏器件。在这里，我们从电子，物理和结构的角度全面介绍了高性能钙钛矿材料，并建立了一个强大的工具包，可用来理解和优化光伏钙钛矿。
更新日期：2018-10-05
中文翻译：
揭示从乙腈中沉积的甲基铵碘化铅的改进的电子和结构性质
基于钙钛矿的光伏技术是一种新兴的太阳能技术，其实验室规模的设备效率超过22％，并且正朝着将其商业化迈出重要一步。常规上，高效钙钛矿太阳能电池是由高沸点，极性非质子溶剂溶液形成的。甲基铵碘化铅（CH 3 NH 3 PbI 3）膜可以由多种溶剂和混合物制成；然而，人们对溶剂体系在确定所得钙钛矿薄膜性能中所起的作用知之甚少。在甲胺（MA）存在下，乙腈（ACN）是一种可行的无毒溶剂，可用于制造CH 3 NH 3 PbI 3效率> 18％的光伏设备。本文中，我们检查了由ACN / MA和二甲基甲酰胺（DMF）制备的薄膜，并使用光谱学，扫描探针成像和离子散射技术检查了它们的物理和电子性能。在用每种溶剂制得的CH 3 NH 3 PbI 3薄膜的化学和电子结构中观察到了显着差异，ACN / MA生产出具有优异性能的薄膜，从而产生了更高效的光伏器件。在这里，我们从电子，物理和结构的角度全面介绍了高性能钙钛矿材料，并建立了一个强大的工具包，可用来理解和优化光伏钙钛矿。
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