The Impact of Atmosphere on Energetics of Lead Halide Perovskites
The Impact of Atmosphere on Energetics of Lead Halide Perovskites
复制标题
DOI：
10.1002/aenm.202000908
复制
发表时间：
2020-05-05
影响因子：
27.8
通讯作者：
Qi, Yabing
中科院分区：
文献类型：
--
作者：
Hu, Zhanhao;Liu, Zonghao;Qi, Yabing
基于金属卤化物钙钛矿的太阳能电池已经成为一种很有前途的低成本光伏技术。到目前为止，大多数实验室规模的设备都是在惰性气氛中制造的，相比之下，大面积低成本生产钙钛矿太阳能电池通常涉及在各种气氛中处理钙钛矿，包括环境空气、氮气和/或真空。本文系统地研究了气氛对甲基铵系卤化铅钙钛矿薄膜能级的影响。改变气氛以模拟典型的制造过程。通过结合费米能级演化、表面光伏、光致发光特性、光伏性能和器件模拟的综合分析，能够确定钙钛矿层的整体能图。这些发现对典型环境下的真实设备有直接影响，并为制造工艺设计和优化提供了见解。此外，这项研究揭示了真空下卤化铅基钙钛矿的普遍费米能级移动，促使人们对没有考虑大气影响的能量学研究进行更新的看法。
Solar cells based on metal halide perovskites have emerged as a promising low-cost photovoltaic technology. In contrast to inert atmospheres where most of the lab-scale devices are made to date, large-area low-cost production of perovskite solar cells often involves processing of perovskites in various atmospheres including ambient air, nitrogen, and/or vacuum. Herein, the impact of atmosphere on the energy levels of methylammonium lead halide perovskite films is systematically investigated. The atmosphere is varied to simulate the typical fabrication process. Through a comprehensive analysis combining the Fermi level evolution, surface photovoltage, photoluminescence properties, photovoltaic performance, and device simulation, an overall landscape of the energy diagram of the perovskite layer is able to be determined. The findings have direct implications for real-world devices under typical atmospheres, and provide insights into the fabrication-process design and optimization. Furthermore, a universal Fermi level shift under vacuum for lead halide-based perovskites revealed in this study, urges a refreshed view on the energetics studies conducted without considering the atmospheric effect.