Details

Autor(en) / Beteiligte

• Hu, Zhanhao
• Liu, Zonghao
• Ono, Luis K.
• Jiang, Maowei
• He, Sisi
• Son, Dae‐Yong
• Qi, Yabing

Titel

The Impact of Atmosphere on Energetics of Lead Halide Perovskites

Ist Teil von

• Advanced energy materials, 2020-06, Vol.10 (24), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Quelle

Wiley-Blackwell Full Collection

Beschreibungen/Notizen

• 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. The energy level alignment of the lead halide perovskite thin film is studied, while subjected to a cycle of atmospheres relevant to industrial production. The atmospheric‐induced doping and dedoping is found to affect the photovoltaic properties significantly. The impact of the environment implies careful control of the atmosphere is necessary for achieving the best device performance.