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Abstract A novel D2-A-D1-A-D2-type donor–acceptor conjugated small molecule (DTPA-Q-BDT-Q-DTPA) with a benzo[1,2- b :4,5- b ′]dithiophene (BDT) core and two D2-A arms has been synthesized and employed as electron donor… Click to show full abstract
Abstract A novel D2-A-D1-A-D2-type donor–acceptor conjugated small molecule (DTPA-Q-BDT-Q-DTPA) with a benzo[1,2- b :4,5- b ′]dithiophene (BDT) core and two D2-A arms has been synthesized and employed as electron donor for organic solar cells. Solution-processed organic photovoltaic (OPV) devices were fabricated with a configuration of ITO/PEDOT:PSS/DTPA-Q-BDT-Q-DTPA:[6,6]-phenyl-C 61 -butyric acid methyl ester (PC 61 BM)/LiF/Al. A power conversion efficiency (PCE) of 1.22% with an open-circuit voltage ( V OC ) of 0.64 V, a short-circuit current ( J SC ) of 6.10 mA cm −2 , and a fill factor ( FF ) of 31.0% was achieved. The PCE is 2.9 times higher than that in the other devices using D2-A-type small molecule TPA-Q-TPA as donor.
Journal Title: Chemical Physics Letters
Year Published: 2017
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