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

Fan, Qunping; Su, Wenyan; Zhang, Ming; Wu, Jingnan; Jiang, Yufeng; Guo, Xia; Liu, Feng; Russell, Thomas P.; Zhang, Maojie; Li, Yongfang

doi:10.1002/solr.201900169

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

Journal Article · Fri Jul 19 00:00:00 EDT 2019 · Solar RRL

DOI:https://doi.org/10.1002/solr.201900169· OSTI ID:1634057

Fan, Qunping ^[1]; Su, Wenyan ^[1]; Zhang, Ming ^[2]; Wu, Jingnan ^[1]; Jiang, Yufeng ^[3]; Guo, Xia ^[1]; Liu, Feng ^[4]; Russell, Thomas P. ^[3]; ^[5]; Li, Yongfang ^[6]

Soochow Univ., Suzhou (China). College of Chemistry
Department of Physics and Astronomy and Collaborative InnovationCenter of IFSA (CICIFSA)Shanghai Jiaotong University Shanghai 200240 China
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy
Soochow Univ., Suzhou (China). College of Chemistry; Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy
Soochow Univ., Suzhou (China). College of Chemistry; Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Chemistry

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 V_oc 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 V_oc of 0.91 V and J_sc 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NNSFC); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1634057

Journal Information:: Solar RRL, Journal Name: Solar RRL Journal Issue: 11 Vol. 3; ISSN 2367-198X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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