无机空穴传输材料碘化亚铜的新型制备方法在钙钛矿太阳能电池中的研究

Developing hole-transporting materials（HTMs）with ease of synthesis and low production cost， is critically vital for perovskite solar cells (PSCs) from future large-scale application point of view. Learned from the previously reported fabrication methods, the thicknesses of CuI films were too thick and/or not uniform, which resulted in significant carrier recombination losses at perovskite/CuI interface, thus lowering the overall performance of the solar cells. In this proposal, a novel fabrication method for CuI through the iodization of copper films, will be applied as inorganic HTMs in PSCs. Through carefully control of the thickness and uniformity of CuI films, the interface charge recombination is expected to be dramatically suppressed..The influences of film thicknesses of CuI films on the photovoltaic characteristics will be scrutinized by using photo-physical and electrochemical impedance spectroscopy etc. The aim of this study is to develop high-performing PSCs based on low-cost inorganic HTM CuI. It will definitely pave the way to construct highly efficient and cheap thin film solar cells in the future.

开发生产成本低廉的无机空穴材料对钙钛矿电池将来大规模生产有着极其重大的意义。目前已报到的制备方法中，碘化亚铜空穴传输层的厚度较厚、薄膜的均匀性较差，导致载流子在界面的复合比较严重，进而影响电池的光电转换效率。针对这些现状，本项目拟将碘化亚铜的一种新型制备方法应用到钙钛矿太阳能电池中。通过调控碘化亚铜空穴传输层的厚度以及均匀性，将界面电荷复合有效抑制。利用光物理化学和电化学阻抗等分析测试手段，探究碘化亚铜薄膜均匀性以及厚度对光电转换效率影响的规律。本项目旨在开发含有无机空穴传输材料碘化亚铜的高效、低成本钙钛矿太阳能电池，为将来大规模生产薄膜太阳能电池奠定基础。

开发生产成本低廉的无机空穴材料对钙钛矿电池将来大规模生产有着极其重大的意义。目前已报到的制备方法中，碘化亚铜空穴传输层的厚度较厚、薄膜的均匀性较差，导致载流子在界面的复合比较严重，进而影响电池的光电转换效率。针对这些现状，通过采用碘蒸气法以及硫氰酸亚铜/碘化亚铜复合材料等方法改善了碘化亚铜的成膜、调控了厚度。其中硫氰酸亚铜/碘化亚铜复合材料有效的结合了母体材料电导性高（碘化亚铜）和成膜性好（硫氰酸亚铜）的优异特性。和单独的碘化亚铜和硫氰酸亚铜相比较，复合材料有效地降低了电池的串联电阻、增加了并联电阻。采用碘化亚铜/硫氰酸亚铜复合空穴传输材料的反式钙钛矿电池取得了处于世界领先的接近19.0%的光电转换效率。该方法制备简便、原料成本低廉并且取得了较高的光电转换效率。为开发低成本、高效率的钙钛矿太阳能电池奠定了基础。

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