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Ultranarrow Bandgap Naphthalenediimide‐Dialkylbifuran‐Based Copolymers with High‐Performance Organic Thin‐Film Transistors and All‐Polymer Solar Cells
Author(s) -
Shi Shengbin,
Chen Peng,
Wang Hang,
Koh Chang Woo,
Uddin Mohammad Afsar,
Liu Bin,
Liao Qiaogan,
Feng Kui,
Woo Han Young,
Xiao Guomin,
Guo Xugang
Publication year - 2020
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202000144
Subject(s) - materials science , polymer , band gap , polymer solar cell , bathochromic shift , acceptor , organic solar cell , electron mobility , thin film , optoelectronics , crystallinity , energy conversion efficiency , polymer chemistry , chemical engineering , nanotechnology , optics , composite material , physics , engineering , fluorescence , condensed matter physics
A new polymer acceptor poly{( N ,N′‐bis(2‐ethylhexyl)‐1,4,5,8‐naphthalenedicarboximide‐2,6‐diyl)‐ alt ‐5,5‐(3,3′‐didodecyl‐2,2′‐bifuran)} (NDI‐BFR) made from naphthalenediimide (NDI) and furan‐derived head‐to‐head‐linked 3,3′‐dialkyl‐2,2′‐bifuran (BFR) units is reported in this study. Compared to the benchmark polymer poly(naphthalenediimide‐ alt ‐bithiophene) (N2200), NDI‐BFR exhibits a larger bathochromic shift of absorption maxima (842 nm) with a much higher absorption coefficient (7.2 × 10 4 m −1 cm −1 ), leading to an ultranarrow optical bandgap of 1.26 eV. Such properties ensure good harvesting of solar light from visible to the near‐infrared region in solar cells. Density functional theory calculation reveals that the polymer acceptor NDI‐BFR possesses a higher degree of backbone planarity versus the polymer N2200. The polymer NDI‐BFR exhibits a decent electron mobility of 0.45 cm 2 V −1 s −1 in organic thin‐film transistors (OTFTs), and NDI‐BFR‐based all‐polymer solar cells (all‐PSCs) achieve a power conversion efficiency (PCE) of 4.39% with a very small energy loss of 0.45 eV by using the environmentally friendly solvent 1,2,4‐trimethylbenzene. These results demonstrate that incorporating head‐to‐head‐linked BFR units in the polymer backbone can lead to increased planarity of the polymer backbone, reduced optical bandgap, and improved light absorbing. The study offers useful guidelines for constructing n‐type polymers with narrow optical bandgaps.