Improved photovoltaic performance of 2,7-pyrene based small molecules via the use of 3-carbazole as terminal unit
2018
Abstract
Small moleculeof Py-2DTBTCz with an Ar(A–D) 2 framework was designed and synthesized as
photovoltaicdonor materials, in which 2,7-pyrene (Py) and benzothiadiazole (BT) were respectively used as central aryl (Ar) and arm acceptor (A), while 3-carbazole (Cz) as terminal donor (D). For comparison, an A–Ar–A type SM of Py-2DTBT without Cz terminal unit was also prepared. The effects of Cz on optical, electrochemical, hole mobility and
photovoltaicproperties were investigated. In solution-processed solar cells, it was observed that the Py-2DTBTCz based devices show significant improvement in
photovoltaicperformance compared to those of Py-2DTBT. Power conversion efficiency (PCE) of Py-2DTBTCz could be as high as 2.89% with a short-circuit current density ( J sc ) of 7.68 mAcm −2 . The results indicate that appending an enlarged Cz π-system to the terminal of A–Ar–A-type
small moleculesfor the construction of an Ar(A–D) 2 framework can significantly improve the
photovoltaicperformance of SMs.
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