Journal
MACROMOLECULES
Volume 48, Issue 3, Pages 562-568Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ma502132t
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Funding
- Air Force Office of Scientific Research (AFOSR) [FA9550-12-1-0074]
- ONR [N00014-11-1-0250]
- Link Foundation Energy Fellowship
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A selenophene-modified PTB7, PBDTSe-TT, is reported. The structure adjustment carried out by alkylselenophene substitution on the BDT building block is shown to slightly affect the polymers electronic property, and an enlarged V-OC of the resulting photovoltaic device is observed. More importantly, the PBDTSe-TT:PC71BM bulk-heterojunction thin film morphology can be optimized through this modification. As a result, an efficient PCE of 8.8% is achieved without using any solvent additive or special interfacial layer. In addition, the PBDTSe-TT-based device is relatively stable under thermal stress, making it a good candidate for fabricating stacking cells. Finally, a similar to 10% PCE tandem device is demonstrated by using identical PBDTSe-TT:PC71BM subcells.
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