Reconstruction of the (EMIm)xMA1–xPb[(BF4)xI1–x]3 Interlayer for Efficient and Stable Perovskite Solar Cells
Source abstract
Abstract
Defective grain boundaries (GBs) and surface trap states are detrimental to the efficiency and stability of perovskite solar cells (PSCs). In this research, ionic liquid (IL) is used to control the defect states at the perovskite surface and GBs. The newly formed (EMIm)xMA1–xPb[(BF4)xI1–x]3 interlayer promotes secondary grain growth to diminish GBs; besides, EMIM+ and BF4– fill the vacancies of MA+ and I– and also passivate undercoordinated Pb2+ trap states. The newly formed interface largely reduces the nonradiative recombination, thus enhancing the solar-cell performance to 19.0% (AM 1.5, 1 sun) with higher photovoltage and fill factor than the control device. Due to the hydrophobicity of the (EMIm)xMA1–xPb[(BF4)xI1–x]3 interlayer, the unencapsulated device stability in 30 days is much better than the control device under relative humidity (RH) = 20%. This work highlights IL-induced secondary grain growth and a defect passivation method for efficient and stable PSCs.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Microelectronic Science and Engineering, Ningbo University, Ningbo, Zhejiang 315211, China
School of Science and Engineering, College of Science and Technology, Ningbo University, Ningbo 315300, China
Funding
Natural Science Foundation of Ningbo · Ningbo University · Natural Science Foundation of Zhejiang Province · Ningbo S&T Innovation 2025 Major Special Program
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