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Issue 41, 2013
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Synthesis and characterization of two carbazole-based alternating copolymers with 4-nitrophenylcyanovinylene pendant groups and their use as electron donors for bulk heterojunction solar cells

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Abstract

Two new carbazole-based copolymers PT and PP carrying thienyl or phenyl, respectively, alternating segments and 4-nitrophenylcyanovinylene pendant groups attached to the carbazole nitrogen were synthesized and characterized. Their optical and electrochemical properties were investigated. Both copolymers showed broad absorption bands in the longer wavelength region, which is complementary to those of PC61BM and PC71BM acceptors, and showed optical band gaps about 1.64 eV and 1.69 eV for PT and PP, respectively. The deep lying HOMO energy level benefited a high open circuit voltage (Voc), leading to an overall power conversion efficiency (PCE) of 2.19%, 2.98% 2.02% and 2.54% for bulk heterojunction (BHJ) solar cells based on PT:PC61BM, PT:PC71BM, PP:PC61BM and PP:PC71BM blends, respectively, processed from tetrahydrofuran (THF) solvent. The BHJ solar cells based on PT:PC71BM and PP:PC71BM blends processed from THF and 1-chloronaphthalene (CN) mixed solvents showed overall PCE of about 5.39% and 4.20%, respectively. The increase in the overall PCE for the BHJ devices based on solvent additives was attributed to the balanced charge transport in the devices.

Graphical abstract: Synthesis and characterization of two carbazole-based alternating copolymers with 4-nitrophenylcyanovinylene pendant groups and their use as electron donors for bulk heterojunction solar cells

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Publication details

The article was received on 09 May 2013, accepted on 05 Aug 2013 and first published on 06 Aug 2013


Article type: Paper
DOI: 10.1039/C3RA42299B
Citation: RSC Adv., 2013,3, 18821-18834
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    Synthesis and characterization of two carbazole-based alternating copolymers with 4-nitrophenylcyanovinylene pendant groups and their use as electron donors for bulk heterojunction solar cells

    G. D. Sharma, M. Singh, R. Kurchania, E. N. Koukaras and J. A. Mikroyannidis, RSC Adv., 2013, 3, 18821
    DOI: 10.1039/C3RA42299B

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