Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 1, Pages 915-922Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b02005
Keywords
ester-substituted pentathiophene; benzotriazole; semitransparent polymer photovoltaic cells; building windows; organic photovoltaic
Funding
- Fundamental Research Funds for the Central Universities [201822002]
- Natural Science Foundation of Shandong Province [ZR2018MEM023]
- National Natural Science Foundation of China [U1806223]
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For oligothiophene-based donor polymers, the reports of pentathiophene are rare, while other oligothiophenes (bi-, ter-, and quaterthiophene) have been broadly studied. Here, we synthesized one wide-band-gap (1.88 eV) polymer PFTzTT-3TC, based on ester-substituted pentathiophene and benzotriazole. PFTzTT-3TC:ITIC (1.0:1.0)-based polymer photovoltaic cells exhibited the best PCE of 8.21% and V-oc of 0.90 V without an additive (such as DIO, 1-CN) or post-treatment. These are the highest PCE and V-oc for ester-substituted pentathiophene-based devices to date. Furthermore, semitransparent polymer photovoltaic cells with an active blend of PFTzTT-3TC:ITIC (1.0:1.0) demonstrate a similar V-oc of 0.89 V and a PCE of 6.43% with an AVT of 26.77% and an AT of 30.58% and CIE (0.25, 0.21). The sky-blue of semitransparent devices is useful for photosynthesis in plants and visual comfort for humans and makes this material suitable for building windows.
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