Molecularly Templated Buried Interfaces for Inverted Perovskite Solar Cells
Abstract
ABSTRACT The buried interface between self‐assembled monolayers (SAMs) and perovskite absorbers critically governs charge extraction and stability in inverted perovskite solar cells, yet remains structurally mismatched and poorly controlled. Here, we report a buried‐interface engineering strategy inspired by non‑covalent molecular templating, enabled by complementary triphenylamine‐based molecular building blocks. A triphenylamine‐based ammonium salt, 2‐(4‐(diphenylamino)phenyl)ethanammonium iodide (TPANI), is introduced into the perovskite precursor, while a structurally matched triphenylamine‐based bisphosphonic acid SAM deposited on ITO serves as the hole‐selective layer. Non‐covalent interactions at the buried interface induce molecular templating and interfacial organization of TPANI, strengthening SAM/perovskite adhesion and reducing intergranular groove depth at the buried side of the perovskite film. The resulting monolithically integrated interface suppresses buried interfacial defects, improves energy‐level alignment, and facilitates hole extraction. Consequently, inverted devices achieve a power conversion efficiency of 26.58% with an exceptionally high fill factor of 86.72%, together with markedly enhanced operational stability. These results demonstrate that non‑covalent molecular templating provides an effective and general strategy for engineering buried interfaces in perovskite photovoltaics.
Article Details
Authors (20)
Songyang Yuan
School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Key Laboratory of Electronic Chemicals for Integrated Circuit Packaging
Quanrun Qiu
Department of Materials Science and Engineering
Huaiman Cao
Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong China
Chengda Ge
Department of Materials Science and Engineering
Yiting Jiang
State Key Laboratory of Advanced Waterproof Materials, School of Materials Science and Engineering
Gengyang Su
Guangdong Zenithnano New material Co., Ltd.
Lingyi Ke
Department of Materials Science and Engineering
Gengxin Du
Department of Materials Science and Engineering
Guangruixing Zou
Department of Materials Science and Engineering
Hui Liu
Guanhua Ren
State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Centre for Computational Chemistry and Research Institute of Industrial Catalysis
Jing Wang
Hunan Cancer Hospital Changsha China
Nan Zhang
Yidan An
Qingduan Li
School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Key Laboratory of Electronic Chemicals for Integrated Circuit Packaging
Ze Yu
State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Molecular Recognition and Biosensing, Frontiers Science Center for New Organic Matter, College of Chemistry
Tao Jia
School of Chemistry and Chemical Engineering
Yue‐Peng Cai
School of Chemistry Guangzhou Key Laboratory of Materials for Energy Conversion and Storage Key Laboratory of Electronic Chemicals For Integrated Circuit Packaging South China Normal University (SCNU) Guangzhou China
Shengjian Liu
School of Chemistry, Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, Key Laboratory of Electronic Chemicals for Integrated Circuit Packaging
Hin‐Lap Yip
Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong China