Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 10, Pages 4324-4330Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta00368h
Keywords
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Funding
- National Natural Science Foundation of China [2170040201, 21325419, 91333204, 51673201]
- Chinese Academy of Sciences [XDB12030200]
- ONR grant [N00141512322]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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So far, the most successful and widely used solvents in polymer solar cells (PSCs) are chlorinated solvents like chloroform (CF), 1,2-dichlorobenzene (DCB) and chlorobenzene (CB), which are highly detrimental to human health and the environment. In this work, by the approach of manipulating flexible and conjugated side groups of a widely used polymer donor material (PBDB-T), two new polymers named PBDB-T-BO and PBDB-BzT are designed and synthesized to improve the solubility and fine-tune the aggregation property in tetrahydrofuran (THF), a much more benign solvent. As a result, an outstanding PCE of 12.10% was achieved with the THF-processed PBDB-BzT: IT-M device. The result in this work demonstrates the importance to modulate the aggregation effect of the polymer in solution by inserting conjugated groups and also suggests a feasible method to convert the main processing solvent of a highly efficient non-fullerene (NF)-PSC from CB into THF.
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