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Title: Synergistic Effects of Side-Chain Engineering and Fluorination on Small Molecule Acceptors to Simultaneously Broaden Spectral Response and Minimize Voltage Loss for 13.8% Efficiency Organic Solar Cells

Abstract

In this paper, three small molecule (SM)-acceptors (POIT-IC, POIT-IC2F, and POIT-IC4F) are developed by combining the side-chain engineering located on the sp3-hybridized carbon atoms of the fused-ring core and the fluorination of end groups. From ITIC to POIT-IC, POIT-IC2F, and then to POIT-IC4F, the SM-acceptors show gradually broadened absorption spectra, increased maximum extinction coefficient, crystallinity, and electron mobilities due to the synergistic effects of side-chain engineering and fluorination. Compared with nonfluorinated ITIC and POIT-IC, as fluorination broadens the molecular spectra, POIT-IC2F and POIT-IC4F with alkoxyphenyl side chains show less decreased LUMO levels than IT-IC2F and IT-IC4F with alkylphenyl side chains, which are conducive to both higher Voc and J sc for organic solar cells (OSCs). Combined with polymer donor PM6, the POIT-IC4F-based OSCs achieve a device efficiency of up to 13.8% with a high Voc of 0.91 V and Jsc of 20.9 mA cm–2, which are significantly higher than that of the control OSCs based on ITIC (8.9%), POIT-IC (10.1%), or IT-IC4F (12.2%). An efficiency of 13.8% is one of the highest PCEs reported for the annealing-free OSCs. Our results show that the synergistic effects of side-chain engineering and fluorination on SM-acceptor can simultaneously broaden spectral response and minimize voltagemore » loss of OSCs and ultimately achieve high device efficiency.« less

Authors:
 [1];  [1];  [2];  [1];  [3];  [1];  [4];  [3]; ORCiD logo [5];  [6]
  1. Soochow Univ., Suzhou (China). College of Chemistry
  2. Department of Physics and Astronomy and Collaborative InnovationCenter of IFSA (CICIFSA)Shanghai Jiaotong University Shanghai 200240 China
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
  4. Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy
  5. Soochow Univ., Suzhou (China). College of Chemistry; Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy
  6. Soochow Univ., Suzhou (China). College of Chemistry; Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Chemistry
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); US Department of the Navy, Office of Naval Research (ONR)
OSTI Identifier:
1634057
Grant/Contract Number:  
AC02-05CH11231; 51573120; 51773142; 91633301; N00014-15-1-2244
Resource Type:
Accepted Manuscript
Journal Name:
Solar RRL
Additional Journal Information:
Journal Volume: 3; Journal Issue: 11; Journal ID: ISSN 2367-198X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; fluorination; organic solar cells; power conversion efficiency; side-chain engineering; small molecule acceptors

Citation Formats

Fan, Qunping, Su, Wenyan, Zhang, Ming, Wu, Jingnan, Jiang, Yufeng, Guo, Xia, Liu, Feng, Russell, Thomas P., Zhang, Maojie, and Li, Yongfang. Synergistic Effects of Side-Chain Engineering and Fluorination on Small Molecule Acceptors to Simultaneously Broaden Spectral Response and Minimize Voltage Loss for 13.8% Efficiency Organic Solar Cells. United States: N. p., 2019. Web. https://doi.org/10.1002/solr.201900169.
Fan, Qunping, Su, Wenyan, Zhang, Ming, Wu, Jingnan, Jiang, Yufeng, Guo, Xia, Liu, Feng, Russell, Thomas P., Zhang, Maojie, & Li, Yongfang. Synergistic Effects of Side-Chain Engineering and Fluorination on Small Molecule Acceptors to Simultaneously Broaden Spectral Response and Minimize Voltage Loss for 13.8% Efficiency Organic Solar Cells. United States. https://doi.org/10.1002/solr.201900169
Fan, Qunping, Su, Wenyan, Zhang, Ming, Wu, Jingnan, Jiang, Yufeng, Guo, Xia, Liu, Feng, Russell, Thomas P., Zhang, Maojie, and Li, Yongfang. Fri . "Synergistic Effects of Side-Chain Engineering and Fluorination on Small Molecule Acceptors to Simultaneously Broaden Spectral Response and Minimize Voltage Loss for 13.8% Efficiency Organic Solar Cells". United States. https://doi.org/10.1002/solr.201900169. https://www.osti.gov/servlets/purl/1634057.
@article{osti_1634057,
title = {Synergistic Effects of Side-Chain Engineering and Fluorination on Small Molecule Acceptors to Simultaneously Broaden Spectral Response and Minimize Voltage Loss for 13.8% Efficiency Organic Solar Cells},
author = {Fan, Qunping and Su, Wenyan and Zhang, Ming and Wu, Jingnan and Jiang, Yufeng and Guo, Xia and Liu, Feng and Russell, Thomas P. and Zhang, Maojie and Li, Yongfang},
abstractNote = {In this paper, three small molecule (SM)-acceptors (POIT-IC, POIT-IC2F, and POIT-IC4F) are developed by combining the side-chain engineering located on the sp3-hybridized carbon atoms of the fused-ring core and the fluorination of end groups. From ITIC to POIT-IC, POIT-IC2F, and then to POIT-IC4F, the SM-acceptors show gradually broadened absorption spectra, increased maximum extinction coefficient, crystallinity, and electron mobilities due to the synergistic effects of side-chain engineering and fluorination. Compared with nonfluorinated ITIC and POIT-IC, as fluorination broadens the molecular spectra, POIT-IC2F and POIT-IC4F with alkoxyphenyl side chains show less decreased LUMO levels than IT-IC2F and IT-IC4F with alkylphenyl side chains, which are conducive to both higher Voc and J sc for organic solar cells (OSCs). Combined with polymer donor PM6, the POIT-IC4F-based OSCs achieve a device efficiency of up to 13.8% with a high Voc of 0.91 V and Jsc of 20.9 mA cm–2, which are significantly higher than that of the control OSCs based on ITIC (8.9%), POIT-IC (10.1%), or IT-IC4F (12.2%). An efficiency of 13.8% is one of the highest PCEs reported for the annealing-free OSCs. Our results show that the synergistic effects of side-chain engineering and fluorination on SM-acceptor can simultaneously broaden spectral response and minimize voltage loss of OSCs and ultimately achieve high device efficiency.},
doi = {10.1002/solr.201900169},
journal = {Solar RRL},
number = 11,
volume = 3,
place = {United States},
year = {2019},
month = {7}
}

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Cited by: 6 works
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Figures / Tables:

Scheme 1 Scheme 1: A schematic diagram of the molecular structure optimization of ITIC derivatives: the blue arrow is side-chain engineering in fused-ring core and the red arrow is fluorination in end groups.

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