Benefiting from Spontaneously Generated 2D/3D Bulk-Heterojunctions in Ruddlesden-Popper Perovskite by Incorporation of S-Bearing Spacer Cation

Advanced Science
Yajie YanZiqi Liang

Abstract

2D Ruddlesden-Popper (RP) perovskite solar cells have manifested superior operation durability yet inferior charge transport compared to their 3D counterparts. Integrating 3D phases with 2D RP perovskites presents a compromise to maintain respective advantages of both components. Here, the spontaneous generation of 3D phases embedded in 2D perovskite matrix is demonstrated at room temperature via introducing S-bearing thiophene-2-ethylamine (TEA) as both spacer and stabilizer of inorganic lattices. The resulting 2D/3D bulk heterojunction structures are believed to arise from the compression-induced epitaxial growth of the 3D phase at the grain boundaries of the 2D phase through the Pb-S interaction. The as-prepared 2D TEA perovskites exhibit longer exciton diffusion length and extended charge carrier lifetime than the paradigm 2D phenylethylamine (PEA)-based analogues and hence demonstrate an outstanding power conversion efficiency of 7.20% with significantly increased photocurrent. Dual treatments by NH4Cl and dimethyl sulfoxide are further applied to ameliorate the crystallinity and crystal orientation of 2D perovskites. Consequently, TEA-based devices exhibit a stabilized efficiency over 11% with negligible hysteresis and di...Continue Reading

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Citations

Nov 5, 2019·Angewandte Chemie·Xingtao WangYixin Zhao
Jun 24, 2020·Reports on Progress in Physics·Chintam HanmandluChih-Wei Chu
May 20, 2021·ACS Applied Materials & Interfaces·Li ChenJian-Xin Tang
Jun 2, 2020·Journal of the American Chemical Society·Di LuYongsheng Liu
May 8, 2020·ACS Applied Materials & Interfaces·Yuanyuan ZhangSung Heum Park

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Methods Mentioned

BETA
electron microscopy
X‐ray
scanning electron microscopy

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