调节FAPbI的结构稳定性和光电性质3通过formamidine离子定向
Shuning Wang1, Qi Yang2, Xiuchen Han1
1College of Science, China University of Petroleum (East China), Qingdao 266580, P. R. China. fangwj@upc.edu.cn.
Physical chemistry chemical physics : PCCP
|April 29, 2024
概括
在formamidine化 (FAPbI3) 中优化formamidine离子 (FA+) 方向,提高稳定性和光电性质. 45°[111]方向显示矿太阳能电池的性能优越.
科学领域:
- 材料科学 材料科学 材料科学
- 固态物理 固态物理
- 太阳能光伏发电是如何实现的
背景情况:
- 有机极大地影响混合矿的稳定性和光电性质.
- 控制有机阴离子的方向对于调整矿材料特性至关重要,但仍然具有挑战性.
研究的目的:
- 研究形式胺酸 (FA+) 定向对形式胺酸 (FAPbI3) 的结构稳定性和光电性质的影响.
- 为提高矿太阳能电池性能确定最佳FA+方向.
主要方法:
- 使用密度函数理论 (DFT) 的计算.
- 在0°,45°,90°和180°沿着[001],[010], [110]和[111]的晶体方向研究了FA+方向.
- 分析了结构参数,能量值,键和电子带结构.
主要成果:
- 沿着[111]方向的FA+的45°方向为FAPbI3.3带来了最高的结构稳定性和出色的光电性能.
- 这种最佳方向导致了最小的能量,更强的键,更短的Pb-I键,并减少了八面体倾斜角.
- FA+方向影响了频段间隙 (在 [110] 中直接转向间接过渡),并导致吸收光谱的红移,增强了光吸收.
结论:
- FA+的分子定向是实现稳定和高效的formamidine酸 Peroovskites的一个关键因素.
- 45°[111]FA+方向为通过分子调节开发高性能矿太阳能电池提供了途径.
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