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Pyran‐Bridged Indacenodithiophene as a Building Block for Constructing Efficient A–D–A‐Type Nonfullerene Acceptors for Polymer Solar Cells
Author(s) -
Wen Shuguang,
Wu Yao,
Wang Yingying,
Li Yi,
Liu Ling,
Jiang Huanxiang,
Liu Zhitian,
Yang Renqiang
Publication year - 2018
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201701917
Subject(s) - acceptor , pyran , thiophene , organic solar cell , polymer solar cell , photochemistry , active layer , chemistry , materials science , tandem , polymer , polymer chemistry , nanotechnology , stereochemistry , organic chemistry , layer (electronics) , physics , thin film transistor , composite material , condensed matter physics
In recent years, nonfullerene acceptors have attracted much attention, owing to their great potential for use in high‐performance polymer solar cells.The ladder‐type building block, pyran‐bridged indacenodithiophene (PDT), was used for constructing A–D–A nonfullerene acceptors through introduction of oxygen atoms into an indacenodithiophene (IDT) unit. The synthesis of PDT is accomplished by a BBr 3 ‐mediated tandem cyclization–deprotection reaction to construct the pyran ring. Hence, molecular acceptor PTIC was synthesized and used in a polymer solar cell device. Compared to the IDT‐based acceptor, PTIC exhibits higher HOMO levels and wider optical band gap at 550–800 nm. Devices fabricated with poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene)‐co‐(1,3‐di(5‐thiophene‐2‐yl)‐5,7‐bis(2‐ethylhexyl)‐benzo[1,2‐c:4,5‐c′]dithiophene‐4,8‐dione)] (PBDB‐T):PTIC as the active layer give a power conversion efficiency (PCE) of 7.66 %.