Effects of Thieno[3,2-<italic style="font-style: italic">b</italic>]thiophene Number on Narrow-Bandgap Fused-Ring Electron Acceptors

Tengfei Li; Guilong Cai; Yuze Lin; Xinhui Lu; Xiaowei Zhan

doi:10.1007/s10118-022-2735-z

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Effects of Thieno[3,2-b]thiophene Number on Narrow-Bandgap Fused-Ring Electron Acceptors

RESEARCH ARTICLE | Updated：2022-07-21

- Effects of Thieno[3,2-b]thiophene Number on Narrow-Bandgap Fused-Ring Electron Acceptors
- Chinese Journal of Polymer Science Vol. 40, Issue 8, Pages: 914-920(2022)
- Affiliations：
  
  a.Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, School of Materials Science and Engineering, Peking University, Beijing 100871, China
  b.Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
  c.Department of Physics, The Chinese University of Hong Kong, Hong Kong 999077, China
- Author bio：
  
  xwzhan@pku.edu.cn
- Funds：
- DOI：10.1007/s10118-022-2735-z
  CLC：
- Received：30 January 2022，
  
  Revised：2022-3-13，
  
  Accepted：14 March 2022，
  
  Online First：17 June 2022，
  
  Published：01 August 2022
- Accepted：
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Li, T.; Cai, G.; Lin, Y.; Lu, X.; Zhan, X. Effects of thieno[3,2-b]thiophene number on narrow-bandgap fused-ring electron acceptors. Chinese J. Polym. Sci. 2022, 40, 914–920

Tengfei Li, Guilong Cai, Yuze Lin, et al. Effects of Thieno[3,2-b]thiophene Number on Narrow-Bandgap Fused-Ring Electron Acceptors[J]. Chinese Journal of Polymer Science, 2022, 40(8): 914-920. DOI: 10.1007/s10118-022-2735-z.
Li, T.; Cai, G.; Lin, Y.; Lu, X.; Zhan, X. Effects of thieno[3,2-b]thiophene number on narrow-bandgap fused-ring electron acceptors. Chinese J. Polym. Sci. 2022, 40, 914–920 DOI： 10.1007/s10118-022-2735-z.

Tengfei Li, Guilong Cai, Yuze Lin, et al. Effects of Thieno[3,2-b]thiophene Number on Narrow-Bandgap Fused-Ring Electron Acceptors[J]. Chinese Journal of Polymer Science, 2022, 40(8): 914-920. DOI: 10.1007/s10118-022-2735-z. DOI：

摘要

Four narrow-bandgap fused-ring electron acceptor materials named as nTTIC (

= 2

and 5) with strong near-infrared absorption are synthesized and the effects of thieno[3

2-b]thiophene number on their photovoltaic performance are systematically studied. 3TTIC yields the best performance

while 5TTIC shows the lowest efficiency.

Abstract

We synthesize and compare four near-infrared absorbing fused-ring electron acceptors named as

TTIC (

and 5)

based on different number of thieno[3

]thiophene (TT) unit as the electron-donating core. With increasing the TT unit

absorption spectrum of the TTIC series red shifts

and the highest occupied molecular orbital (HOMO) upshifts notably. It is worth noting that 4TTIC and 5TTIC exhibit absorption edges approaching 1100 nm

which is the photoresponse limit of solar cells based on crystal silicon. When the TTIC series acceptors are blended with polymer donor PM6

the binary-blend organic solar cells based on 3TTIC show the best power conversion efficiency (PCE) of 13.1%. In contrast

2TTIC-based devices exhibit relatively lower PCE of 8.32%

mainly caused by the larger energy loss and blue-shifted absorption. Due to insufficient driving force of charge separation caused by very high HOMO

4TTIC and 5TTIC show poor PCEs lower than 3%.

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⁰

Effects of Thieno[3,2-b]thiophene Number on Narrow-Bandgap Fused-Ring Electron Acceptors

DOI：10.1007/s10118-022-2735-z

摘要

Abstract

关键词

Keywords

references