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Enhanced stability of perovskite solar cells using hydrophobic organic fluoropolymer

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First Author:Liu, Hongzhu

Correspondence Author:Bian, JM (reprint author), Dalian Univ Technol, Minist Educ, Sch Phys, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China.; Shi, YT (reprint author), Dalian Univ Technol, Sch Chem, State Key Lab Fine Chem, Dalian 116024, Peoples R China.

Co-authors:Wang, Minhuan,Bian, Jiming,Feng, Yulin,Wang, Zefeng,Zhang, Bingye,Shi, Yantao

Date of Publication:2018-07-09

Journal:APPLIED PHYSICS LETTERS

Included Journals:SCIE

Volume:113

Issue:2

ISSN No.:0003-6951

Abstract:Hydrophobic organic fluoropolymers (HOFPs) with excellent hydrophobic, heat-resistant, and sunlight-transparent properties were synthesized by emulsion polymerization. The HOFP layer was inserted between a (FAMA) Pb(IBr)(3) active layer and a hole transport layer in perovskite solar cells (PSCs). The performance of the resulting PSC devices depends highly on the thickness of the HOFP layer. Under optimized HOFP thickness, a moderate steady power conversion efficiency (PCE) of 16.9% was achieved. Remarkably, the optimized PSCs without any encapsulation exhibit outstanding shelf stability under ambient conditions, and the PCE could maintain 80% of its initial value after 2400 h (100 days), which was among the ever reported best stability whereas, the reference device without HOFP shows rapid severe degradation after only a few days. The significantly improved stability of PSCs was mainly ascribed to the impermeable barrier properties of the HOFP layer, which protect the perovskite active layer against moisture and oxygen from the ambient atmosphere. Published by AIP Publishing.

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