Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 95, Issue 7, Pages 1731-1740Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2011.01.041
Keywords
Bulk heterojunction solar cell; Small molecule; Molecular engineering
Funding
- WCU (the Ministry of Education and Science) [R31-2008-000-10035-0]
- Ministry of Information and Communication, Korea under ITRC [IITA 2008 C 10900904 0013]
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New symmetrical low band-gap small molecule materials, DPP-bis[ter-3HT-TPA] and DPP-bis[ter-3HT] as novel derivatives of Diketopyrrolopyrrole-thiophene with/without triphenylamine (TPA) end group have been synthesized and characterized. And the effects of TPA moiety were investigated. Compared to DPP-bis[ter-3HT], DPP-bis[ter-3HT-TPA] shows red-shifted absorption and significantly higher molar absorption coefficient. And the HOMO level of DPP-bis[ter-3HT-TPA] is elevated than DPP-bis[ter-3HT]. Moreover, DPP-bis[ter-3HT-TPA] exhibited one order higher hole mobility than DPP-bis[ter-3HT], suggesting that TPA contributes to a better hole mobility. The bulk-heterojunction photovoltaic devices with DPP-bis[ter-3HT-TPA] showed better efficiencies than DPP-bis[ter-3HT], showing the best power-conversion efficiency (PCE) of 1.5% (+/- 0.12) under 100 mW/cm(2) with a short-circuit current (J(sc))=5.73 mA/cm(2), a fill factor (FF)=0.45, and an open-circuit voltage (V-oc)=0.59 mV. (C) 2011 Elsevier B.V. All rights reserved.
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