DataVXACS Energy LettersPaper
journal article·2022-05-13Open access

Pseudohalide-Assisted Growth of Oriented Large Grains for High-Performance and Stable 2D Perovskite Solar Cells

Weichuan Zhang, Xianxin Wu, Jin Zhou, Bing Han, Xinfeng Liu, Yuan Zhang, Huiqiong Zhou

ACS Energy Letters· Volume 7· Issue 5
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Source abstract

Abstract

Defects from grains and boundaries and the random phase distribution of 2D perovskite films generally cause nonradiative recombination and a reduction in carrier transport and stability. Herein, we find that pseudohalides can promote the growth of oriented large-grained 2D perovskite films. It is shown that pseudohalide additives can induce the aggregation and the assembly of 2D perovskites, effectively facilitate the assembly of random low-n phases into pure high-n phases, and enlarge the corresponding grain sizes of films. Concurrently, the phase distribution, crystalline quality, and carrier transport of perovskite films are also improved. As a result, the pseudohalide-optimized perovskite solar cells achieve remarkably improved PCEs of 18.72% and a negligible hysteresis. Importantly, the unencapsulated devices retain 100% of the initial efficiencies at persistent heating at 55 °C for 1180 h. After they were kept operating under the maximum power point (MPP) with continuous light illumination for about 1200 h, the devices showed only 13.3% efficiency degradation.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

CAS Key Laboratory of Nanosystem and Hierachical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People’s Republic of China

University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China

CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People’s Republic of China

The Department of Thoraciccardio Surgery, PLA Rocket Force Characteristic Medical Center, Beijing 100088, People’s Republic of China

School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, People’s Republic of China

Funding

Ministry of Science and Technology · Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Chinese Academy of Sciences · DNL Cooperation Fund, CAS

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