Journal
MATERIALS CHEMISTRY FRONTIERS
Volume 2, Issue 1, Pages 136-142Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7qm00403f
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Funding
- National Basic Research Program of China (973 Program) [2014CB643502]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12010200]
- National Natural Science Foundation of China [91333113, 21572234, 61505225]
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A weak electron-donating ladder-type heteroarene, indacenodibenzothiophene (IDBT), is designed and synthesized for the development of acceptor-donor-acceptor (A-D-A)-type small-molecule acceptors featuring a large optical bandgap to match high-performance low-bandgap electron donors. Small-molecule acceptor NIDBT based on the IDBT core and 2-(2,3-dihydro-3-oxo-1H-inden-1ylidene) propanedinitrile as an electron-deficient end group is designed and synthesized. NIDBT shows a wide optical bandgap of 1.84 eV with a high absorption coefficient. A low-bandgap polymer PTB7-Th is selected as the donor to construct photovoltaic devices with NIDBT as the acceptor. After a thermalannealing treatment at 160 degrees C for 10 min, an optimal power conversion efficiency (PCE) of 4.45% with an open-circult voltage (V-oc) of 0.831 V, a short-circuit current (J(sc)) of 11.45 mA cm(-2) and a fill factor (FF) of 46.73% is realized.
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