Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202206311
Keywords
Chromium; Dithienophthalimide; Donor; Polymer; Solar Cells
Categories
Funding
- National Natural Science Foundation of China [22071114, 22022103, 21871146]
- Haihe Laboratory of Sustainable Chemical Transformations
- National Key Research and Development Program of China [2019YFA0210500]
- Frontiers Science Center for New Organic Matter Nankai University [63181206]
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Imide-functionalized arenes have shown great potential as acceptor units in organic solar cells (OSCs). However, the use of dithienophthalimide (DPI) has been limited due to the high cost of synthesis. In this study, the synthesis of DPI skeleton was simplified and the cost was significantly reduced using chromium-mediated cyclization. Two nonhalogenated D-A copolymers based on DPI were successfully synthesized. The binary OSCs based on pBDTT-DPI-Me : Y6 achieved a high power conversion efficiency of 16.55%, demonstrating DPI as an attractive A-unit for further exploration in OSCs.
Imide-functionalized arenes have been one of the most promising acceptor (A) units in organic solar cells (OSCs). However, dithienophthalimide (DPI), a hybrid of thieno-[3,4-c]pyrrole-4,6-dione (TPD) and bithiophene imide (BTI) units, has not been revisited since its first synthesis, likely owing to the high synthetic cost of the reported method. In this work, we simplified the synthetic procedure of the DPI skeleton with a significant reduction of the synthetic cost by using chromium-mediated cyclization as the key chemistry. Using this method, two DPI-based nonhalogenated D-A copolymers are synthesized. The binary OSCs based on pBDTT-DPI-Me : Y6 achieves a power conversion efficiency as high as 16.55 %, highlighting DPI as an attractive A-unit for further exploration in OSCs.
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