氯离子添加剂对钙钛矿太阳能电池性能的调节

Regulation of Perovskite Solar Cells Performances by Chloride Ion Additive

过去几年,有机无机杂化的钙钛矿太阳能电池在光伏领域引起了广泛地关注,钙钛矿电池性能提升的关键是制备高质量的钙钛矿薄膜,而引入添加剂是制备高质量钙钛矿薄膜的重要方法之一。本文引入了两种不同的添加剂(浓盐酸和PbCl2)到钙钛矿前驱体溶液中,通过不同摩尔比的掺杂来调控钙钛矿薄膜的结晶度和表面覆盖率。然后采用SEM、XRD和紫外可见吸收光谱等表征手段分析钙钛矿薄膜的性能。结果表明:少量的Cl-添加剂可以优化钙钛矿薄膜的性能,提高钙钛矿层的覆盖率和光吸收特性。当掺杂PbCl2∶PbI2摩尔比为1∶9时,钙钛矿电池的各项参数有明显的提升,电池的PCE达到了11.35%;作为对比,当掺入HCl∶PbI2的摩尔比为1∶9时,电池的PCE仅为6.19%。因此PbCl2是比浓盐酸更好的Cl-添加剂,可以改善钙钛矿薄膜质量和提升钙钛矿太阳能电池性能。

In the past years,organic-inorganic hybrid perovskite solar cells( PSCs) have gained wide attention in the photovoltaic field,where high quality perovskite thin film is the key to improve the performances of PSCs,and additives doping is one of important methods to produce high-quality perovskite films. In this paper,two different additives,such as hydrochloric acid and PbCl2 were added in the perovskite precursor solution with different ratios to regulate the crystallinity and surface coverage of perovskite films. Then the performances of perovskite films were analyzed by SEM,XRD and UV-Vis absorption spectroscopy. The results show that a small amount of Cl-additive can optimize the performances of the films,including increasing the crystallization and light absorption of the perovskite layers. When the doping molar ratio of PbCl2 and PbI2 is 1: 9,the performances of PSCs were obviously improved,with the PCE has exceeded 11. 35%. As comparison,when the doping molar ratio of HCl and PbI2 is 1: 9,the PCE of PSCs is only 6. 19%. These results show that PbCl2 is a better Cladditive than hydrochloric acid,and PbCl2 is an effective additive to improve the quality of perovskite films and increase the PCE of PSCs.