Ultranarrow Bandgap Naphthalenediimide-Dialkylbifuran-Based Copolymers with High-Performance Organic Thin-Film Transistors and All-Polymer Solar Cells
- Authors
- 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
- Issue Date
- Jun-2020
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- absorption coefficients; all-polymer solar cells; polymer acceptors; ultranarrow bandgap
- Citation
- MACROMOLECULAR RAPID COMMUNICATIONS, v.41, no.12
- Indexed
- SCIE
SCOPUS
- Journal Title
- MACROMOLECULAR RAPID COMMUNICATIONS
- Volume
- 41
- Number
- 12
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/55439
- DOI
- 10.1002/marc.202000144
- ISSN
- 1022-1336
- Abstract
- 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 x 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.
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