Journal
ACS ENERGY LETTERS
Volume 2, Issue 9, Pages 1971-1977Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00551
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Funding
- SUSTech
- Recruitment Program of Global Youth Experts of China
- National Basic Research Program of China [2013CB834805]
- Natural Science Foundation of Guangdong Province [2016A030313637]
- Shenzhen Fundamental Research Programs [JCYJ20160504151731734]
- Shenzhen Key Lab Funding [ZDSYS201505291525382]
- Shenzhen Peacock Program [KQTD20140630110339343]
- U.S. Department of Energy, Office of Science, Materials Science and Engineering Division
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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The chlorinated polymer, PBTCI, has been found to be an efficient donor in nonfullerene polymer solar cells (PSCs), which showed a blue-shifted absorbance compared to that of its fluorine analogue (PTB7-th) and resulted in more complementary light absorption with a nonfullerene acceptor, such as ITIC. Meanwhile, chlorine substitution lowered the HOMO level of PBTCI, which increased the open-circuit voltage of the corresponding polymer-based devices. The 2D GIWAXS analysis illustrated that the PBTCI/ITIC blend film exhibited a face-on orientation and scattering features of both PBTCI and ITIC, suggesting that the blend of PBTCI and ITIC was phase-separated and formed individual crystalline domains of the donor and acceptor, which promoted charge transfer in the bicontinuous film and eventually elevated the solar energy conversion efficiency. The PBTCI-based nonfullerene PSC exhibited a maximum PCE of 7.57% with a V-oc of 0.91 V, which was an approximately 13% increasing in the PCE compared to that of the fluorine-analogue-based device.
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