Premium
An Interlocking Fibrillar Polymer Layer for Mechanical Stability of Perovskite Solar Cells
Author(s) -
Jeong Seonju,
Lee Inhwa,
Kim TaekSoo,
Lee JungYong
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202001425
Subject(s) - materials science , perovskite (structure) , polymer , layer (electronics) , photoactive layer , composite material , chemical engineering , optoelectronics , polymer solar cell , nanotechnology , engineering
Atmospheric and mechanical stability of perovskite solar cells (PSCs) must be guaranteed for successful commercialization. A fibrillar polymer, poly[ N ‐9′‐heptadecanyl‐2,7‐carbazole‐alt‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)] (PCDTBT), is reported as an efficient hole transfer layer (HTL) which significantly improves air and mechanical stability of perovskite solar cells (PSCs). PCDTBT fibrils formed at the grain boundaries of perovskite layer induce the highest fracture energies in the PSCs, which provide extrinsic reinforcement and shielding for enhanced mechanical and chemical stability. Debonding energy increases by 30% for the PSCs with PCDTBT fibrils, which fractures at 2.66 J m −2 , compared to the devices without PCDTBT fibrils at 2.09 J m −2 ; more importantly, the threshold debonding driving force of the PCDTBT fibril‐based devices is greatly improved by twofold under ambient conditions.