磷氧类分子修饰提升无空穴传输层钙钛矿太阳能电池光伏性能研究

Phosphine oxygen molecular modification to enhance thephotovoltaic performance of hole-transport-layer-free perovskite solar cells

无空穴传输层钙钛矿太阳能电池在简化制备工艺、降低器件成本方面具有独特优势.为了克服界面严重的载流子复合,提高光伏性能和稳定性,本文选用[双(4-甲氧苯基)磷氧基]氨基甲酸叔丁酯(POM)分子修饰钙钛矿上表面.结果表明,旋涂POM层有效钝化了钙钛矿上表面缺陷,抑制了界面载流子复合,提高了空穴传输能力.基于POM优化的PSCs获得了22.32%的最高光电转换效率(PCE),明显高于对照器件20.39%的PCE.同时,POM修饰后,钙钛矿薄膜疏水性大幅度提高,器件在室温20~25℃和30%相对湿度下存放30 d仍保持90%的初始PCE.该工作为高效稳定无空穴传输层钙钛矿太阳能电池的设计与开发提供了有效的技术方案.

Hole-transport-layer-free perovskite solar cells(PSCs)have unique advantages in simplifying preparation processes and reducing device costs.In order to overcome its severe carrier recombination at the interface and improve the photovoltaic performance and stability,the[bis(4-methoxyphenyl)phosphooxy]aminobutyl ester(POM)molecule was selected to modify the surface of perovskite.The results indicate that the spin-coated POM layer effectively passivates the surface defects on perovskite films,suppresses the interface carrier recombination,and improves the hole transport capability.The POM based on PSCs achieves the highest photoelectric conversion efficiency(PCE)of 22.32%,which is significantly higher than 20.39%of control device.Meanwhile,the hydrophobicity of the perovskite film is significantly improved after POM modification,and the device maintains 90%of its initial PCE even after being stored at room temperature from 20℃to 25℃and 30%relative humidity for 30 days.This work provides an effective technical solution for the design and development of efficient and stable hole-transport-layer-free PSCs.