High-Performance All-Polymer Solar Cells Enabled by n-Type Polymers with an Ultranarrow Bandgap Down to 1.28 eV
- Authors
- Feng, Kui; Huang, Jiachen; Zhang, Xianhe; Wu, Ziang; Shi, Shengbin; Thomsen, Lars; Tian, Yanqing; Woo, Han Young; McNeill, Christopher R.; Guo, Xugang
- Issue Date
- 7월-2020
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- all-polymer solar cells; electron mobility; n-type polymers; power conversion efficiency; ultranarrow bandgap
- Citation
- ADVANCED MATERIALS, v.32, no.30
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED MATERIALS
- Volume
- 32
- Number
- 30
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/54841
- DOI
- 10.1002/adma.202001476
- ISSN
- 0935-9648
- Abstract
- Compared to organic solar cells based on narrow-bandgap nonfullerene small-molecule acceptors, the performance of all-polymer solar cells (all-PSCs) lags much behind due to the lack of high-performance n-type polymers, which should have low-aligned frontier molecular orbital levels and narrow bandgap with broad and intense absorption extended to the near-infrared region. Herein, two novel polymer acceptors, DCNBT-TPC and DCNBT-TPIC, are synthesized with ultranarrow bandgaps (ultra-NBG) of 1.38 and 1.28 eV, respectively. When applied in transistors, both polymers show efficient charge transport with a highest electron mobility of 1.72 cm(2) V-1 s(-1) obtained for DCNBT-TPC. Blended with a polymer donor, PBDTTT-E-T, the resultant all-PSCs based on DCNBT-TPC and DCNBT-TPIC achieve remarkable power conversion efficiencies (PCEs) of 9.26% and 10.22% with short-circuit currents up to 19.44 and 22.52 mA cm(-2), respectively. This is the first example that a PCE of over 10% can be achieved using ultra-NBG polymer acceptors with a photoresponse reaching 950 nm in all-PSCs. These results demonstrate that ultra-NBG polymer acceptors, in line with nonfullerene small-molecule acceptors, are also available as a highly promising class of electron acceptors for maximizing device performance in all-PSCs.
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