Conjugated donor–acceptor terpolymers entailing the Pechmann dye and dithienyl-diketopyrrolopyrrole as co-electron acceptors: tuning HOMO/LUMO energies and photovoltaic performances. Issue 23 (6th May 2016)

• Record Type: Journal Article
• Authors: Qi, Penglin; Wang, Zhijie; Liu, Zitong; Yang, Sifen; Yang, Yang; Yao, Jingjing; Zhang, Guanxin; Zhang, Deqing
• Is Part Of: Polymer chemistry. Volume 7:Issue 23(2016)
• Page Start: 3838
• Page End: 3847
• Publication Date: 2016-05-06
• Subjects: Polymers -- Periodicals; Macromolecules -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1039/c6py00400h
• Languages: English
• ISSNs: 1759-9954

Abstract

Abstract : Three new conjugated D–A terpolymers with the Pechmann dye derivative and dithienyl-diketopyrrolopyrrole as co-acceptors are presented for photovoltaic studies. Abstract : Three conjugated D–A terpolymersPBPD1, PBPD2, andPBPD3 with the Pechmann dye-derived electron acceptor and dithienyl-diketopyrrolopyrrole as co-acceptors are presented. Their HOMO/LUMO energies and absorptions can be tuned by varying the ratios of two acceptors. Importantly, HOMO energies of these terpolymers are lowered by increasing the content of the Pechmann dye-derived electron acceptor in the conjugated backbones. The thin blend films ofPBPD1, PBPD2, andPBPD3 with PC71 BM have been tested as active layers for polymer solar cells. The blend ofPBPD1 :PC71 BM shows a high power conversion efficiency of up to 5.21%, which is higher than that with the blend of the dithienyl-diketopyrrolopyrrole-based polymer without the Pechmann dye-derived electron acceptor and PC71 BM. In addition, the neat thin films ofPBPD1, PBPD2, andPBPD3 exhibit ambipolar semiconducting properties with hole and electron mobilities up to 0.604 cm 2 V −1 s −1 and 0.225 cm 2 V −1 s −1 .