Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 44, Pages 30320-30327Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b06405
Keywords
organic solar cells; star-type small molecules; fluorine-substituted benzothiadiazole; triphenylamine; photovoltaics
Funding
- National Natural Science Foundation of China [91233112, 51403178, 21172187, 51673031]
- Program for Innovative Research Cultivation Team in University of Ministry of Education of China [1337304]
Ask authors/readers for more resources
To simultaneously improve both open-circuit voltage (V-oc) and short-circuit current density (J(sc)) for organic solar cells, a novel D(A-pi-Ar)(3) type of photovoltaic small molecules of TPA(FxBT-T-3Cz)(3) was designed and synthesized, which contain central triphenylamine (TPA), terminal carbazole (Cz), armed fluorine-substituted benzothiadiazole (FxBT, where x = 1 or 2), and bridged thiophene (T) units. A narrowed ultraviolet visible absorption and a decreasing highest occupied molecular orbital energy level were observed from TPA(F1BT-T-3Cz)(3) to TPA(F2BT-T-3Cz)(3) with increasing fluorine substitution. However, the TPA(F2BT-T-3Cz)(3)/PC71BM-based solar devices showed a rising V-oc of 1.01 V and an enhanced J(sc) of 10.84 mA cm(-2) as well as a comparable power conversion efficiency of 4.81% in comparison to the TPA(F1BT-T-3Cz)(3)/PC71BM-based devices. Furthermore, in comparison to the parent TPA(BT-T-3Cz)(3) molecule without fluorine substitution, the fluorine-substituted TPA(FxBT-T-3Cz)(3) molecules exhibited significantly incremental V-oc and J(sc) values in their bulk heterojunction organic solar cells, owing to fluorine incorporation in the electron-deficient benzothiadiazole unit.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available