光伏
钙钛矿(结构)
材料科学
椭圆偏振法
光电子学
介电常数
半导体
电介质
卤化物
薄膜
微晶
光伏系统
纳米技术
化学
无机化学
结晶学
生物
冶金
生态学
作者
Yajie Jiang,Arman Mahboubi Soufiani,Angus Gentle,Fuzhi Huang,Anita Ho‐Baillie,Martin A. Green
摘要
Mixed organic-inorganic halide perovskites have emerged as a promising new class of semiconductors for photovoltaics with excellent light harvesting properties. Thorough understanding of the optical properties of these materials is important for photovoltaic device optimization and the insight this provides for the knowledge of energy band structures. Here we present an investigation of the sub-room temperature dependent optical properties of polycrystalline thin films of CH3NH3PbI3 perovskites that are of increasing interest for photovoltaics. The complex dielectric function of CH3NH3PbI3 in the energy range of 0.5–4.1 eV is determined between 77 K and 297 K using spectroscopic ellipsometry. An increase in optical permittivity as the temperature decreases is illustrated for CH3NH3PbI3. Optical transitions and critical points were analyzed using the energy dependent second derivative of these dielectric functions as a function of temperature.
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