Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 54, Issue 31, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/abfc8b
Keywords
perovskite solar cells; alkali metal fluoride; point defects; grain boundaries; hysteresis
Categories
Funding
- National Natural Science Foundation of China [61604131, 61704154, 11804300]
- Natural Science Foundation of Zhejiang Province [LY19F040009]
- Fundamental Research Funds of Zhejiang Sci-Tech University [2020Q039]
- National Undergraduate Training Program for Innovation [202010338031]
- Xinmiao Undergraduate Student Talents Program of Zhejiang Province [2019R406018]
- Open Project of Key laboratory of Solar Energy Utilization & Energy Saving Technology of Zhejiang Province
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By adding alkali metal fluorides, especially potassium fluoride, to the perovskite precursor, the defect behaviors of perovskite films were successfully modulated, leading to improved performance of solar cells with significantly enhanced power conversion efficiency.
Solution-processed organic/inorganic hybrid halide perovskites are a class of very promising photovoltaic materials because of their extraordinary optoelectronic properties. However, numerous intrinsic defects within perovskite films limit the performance enhancement of perovskite solar cells (PSCs). Herein, we introduce three different alkali metal fluoride additives into the perovskite precursor to modulate the defect behaviors. The addition of alkali metal fluorides, especially potassium fluoride (KF), significantly passivates grain boundaries and point defects within bulk perovskite films, contributing to increased carrier lifetime and reduced defect state density. By optimizing the concentration of additives, the PSC device with 1% KF added has realized a significantly enhanced power conversion efficiency of 20.11%, and ignorable hysteresis.
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