Journal
ADVANCED MATERIALS
Volume 30, Issue 27, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201706361
Keywords
alkylsilyl-thienyl conjugated side-chains; organic small-molecule donor materials; organic solar cells
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Funding
- Ministry of Science and Technology of China (973 project) [2014CB643501]
- National Natural Science Foundation of China [91633301, 21734008, 51673200]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12030200]
- Office of Naval Research (ONR) [N00141512322]
- University of North Carolina General Administration Research Opportunity Initiative (ROI) grant
- U.S. Department of Energy [DE-AC02-05CH11231]
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Two medium-bandgap p-type organic small molecules H21 and H22 with an alkylsily-thienyl conjugated side chain on benzo[1,2-b:4,5-b']dithiophene central units are synthesized and used as donors in all-small-molecule organic solar cells (SM-OSCs) with a narrow-bandgap n-type small molecule 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC) as the acceptor. In comparison to H21 with 3-ethyl rhodanine as the terminal group, H22 with cyanoacetic acid esters as the terminal group shows blueshifted absorption, higher charge-carrier mobility and better 3D charge pathway in blend films. The power conversion efficiency (PCE) of the SM-OSCs based on H22:IDIC reaches 10.29% with a higher open-circuit voltage of 0.942 V and a higher fill factor of 71.15%. The PCE of 10.29% is among the top efficiencies of nonfullerene SM-OSCs reported in the literature to date.
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