Boosting Stability of Cesium/Formamidinium Based Perovskite Solar Cells via Eliminating Intermediate Phase Transition and X-Anion Vacancy

IF 8.3 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Leilei Gu, Mingzhu Chen, Xianming Liu, Yanbo Gu, Dongnian Chen, Shubo Wang
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Abstract

Boosting the stability of cesium/formamidinium (Cs/FA) based perovskite solar cells (PSCs) has received tremendous attention. However, the crystallization of perovskites usually undergoes complex intermediate phase transitions and ion loss processes, which seriously degrade the efficiency and stability of PSCs. Herein, iodine monobromide (IBr, an interhalogen) is incorporated into the precursor solution to regulate the perovskite crystallization process. IBr can directly induce the formation of perovskite crystal nuclei in the intermediate film, avoiding a complex phase transformation (2H-4H-3C). This leads to a reduction in the impurity phase, an increase in grain size, and an improvement in crystal quality. Furthermore, IBr can effectively compensate X-anion vacancy, thereby reducing defect density and nonradiative recombination, which enhances device performance. Thus, the efficiency of the optimal device is 24.82%. Simultaneously, the device demonstrated excellent stability. After 400 h of continuous operation, the efficiency value of the unencapsulated PSCs still retains 89% of its initial value. This study provides an effective strategy for manufacturing PSCs with excellent efficiency and stability.

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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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