Affiliation:
1. State Key Laboratory of Solidification Processing Center for Nano Energy Materials School of Materials Science and Engineering Northwestern Polytechnical University Xi′an 710072 China
2. State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology Shaanxi Joint Key Laboratory of Graphene School of Microelectronics Xidian University Xi′an 710071 China
Abstract
AbstractAll‐layer‐inorganic perovskite solar cells (PSCs) are prized for their remarkable thermal stability and low cost. However, “imperfect contact” at the perovskite heterojunction hinders charge transport and causes photochemical deterioration, restricting photovoltaic performance, and operational stability. Herein, an efficient perovskite/TiO2 heterojunction is constructed, produced by adding TiO2 to an antisolvent to concurrently form a CsPbI2Br perovskite layer and a top TiO2 electron transport layer in one step, which significantly improves the interfacial contact and thus facilitates charge transport at the heterojunction. The resultant inverted all‐layer‐inorganic PSCs exhibit a superior efficiency of 17.1%. Moreover, given the high‐quality perovskite/TiO2 heterojunction and low interface defects, the encapsulated PSCs retain 91% or 92% of their initial efficiency for 1000 h under maximum power point tracking or damp‐heat conditions (85 °C and 85% relative humidity), respectively. Surprisingly, the unencapsulated PSCs maintain an initial efficiency of 86% during aging, even at 200 °C for 200 h.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Subject
General Materials Science,Renewable Energy, Sustainability and the Environment
Cited by
7 articles.
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