journal article·2026-01-09

Spatially Selective Molecular Engineering for Multiscale Defect Mitigation in Perovskite Photovoltaics

Shanshan Du, Niqian Du, Kaikai Liu, Xueyuan Li, Xiaobo Zhang, Tingwei He, Jing Li, Yaru Du, Xiaoyi Hou, Zhiyong Liu, Wallace C. H. Choy

ACS Energy Letters· Volume 11· Issue 1
Publisher page

Abstract

Perovskite solar cells (PSCs) have achieved remarkable progress through suppressing nonradiative recombination via surface and bulk treatment. However, randomly integrating surface and bulk treatments mutually interfere with their functions, limiting the superposed efficacy in defect mitigation. Herein, we present a spatially complementary multiscale defect-management strategy through the selective integration of cesium trifluoroacetate (CsTFA) additives with phenethylammonium bromide (PEABr) surface treatments. Driven by top-down crystallization of perovskite films, CsTFA preferentially migrates to the bottom region of the perovskite film, eliminating the unexpected interference with the top surface ligands. CsTFA suppresses bulk defects through Pb 2+ -carbonyl coordination and hydrogen bonding, while a formed two-dimensional (PEA) 2 PbI 4 top capping layer terminates the surface dangling bonds. This synergistic strategy yields perovskite films with reduced defects and extended carrier lifetimes. The optimized devices demonstrate the power conversion efficiency (PCE) of 25.84% with enhanced stability, maintaining 84.46% of the initial efficiency under ambient conditions for 2000 h.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · TiO2 Photocatalysis and Solar Cells · Advanced Photocatalysis Techniques

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

Affiliations

Henan Key Laboratory of Advanced Semiconductor & Functional Device Integration, School of Physics

Henan Normal University

Henan Key Laboratory of Optoelectronic Energy Storage Materials and Applications, School of Physics and Engineering

Henan University of Science and Technology

Department of Electrical and Electronic Engineering

The University of Hong Kong

College of Physics Science and Technology

Hebei University

Key Laboratory of Photochemical Conversion and Optoelectronic Materials

Technical Institute of Physics and Chemistry, Chinese Academy of Sciences

Materials Innovation Institute for Life Sciences and Energy (MILES)

The University of Hong Kong Shenzhen Institute of Research and Innovation

Funding

Natural Science Foundation of Henan Province · Natural Science Foundation of Hebei Province · Research Grants Council, University Grants Committee · Baoding City Science and Technology and Intellectual Property Bureau · University Research Committee, University of Hong Kong · China Postdoctoral Science Foundation · Innovation and Technology Fund · Department of Education of Hebei Province · National Natural Science Foundation of China · Henan Provincial Science and Technology Research Project · HKU-Shenzhen Institute of Research and Innovation

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