Synthesis and studies of carbazole-based donor polymer for organic solar cell applications
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We have developed a carbazole-based electron donor material, containing extended thiophene π-conjugated through a cyanovinylene spacer in order to enhance the effective intramolecular charge transfer for bulk heterojunction polymer solar cell (BHJ-PSC) applications. The polymer was synthesized via FeCl3 oxidative polymerization method, namely poly(2E,2′E)-3,3′-(9-hexyl-9H-carbazole-3,6-diyl)bis(2-(5-methylthiophen-2yl)acrylonitrile (CN-PICTAN). The CN-PICTAN formation was confirmed by Fourier transformed infrared, nuclear magnetic resonance spectroscopy, and gel permeation chromatography techniques. The CN-PICTAN showed a broad absorption and emission range with optical band gap (Egopt) of 2.1 eV. The CN-PICTAN exhibited a high thermal stability with 5% weight loss at 356 °C and deep-lying highest occupied molecular orbital level of − 5.23 eV. The BHJ-PSC device fabricated with CN-PICTAN:PC61BM (1:1.5) showed a power conversion efficiency of 1.23%, which was enhanced to 1.73% after the device was annealed at 100 °C.
KeywordsCarbazole Low band gap Organic solar cell Polymer BHJ device
We are thankful to VIT Management for providing the laboratory facilities and VIT SIF for spectral study. The characterizations were carried out at CSIR-CECRI, Karaikudi.
The financial support of DST for this project (Ref. SB/FT/CS-185/2011 dated 01.08.2013) and Solar Energy Research Initiative (SERI) Programme (DST/TM/SERI/FR/172(G)) is highly appreciated by the authors. The research is supported by the South African Research Chairs Initiative of the Department of Science and Technology and the National Research Foundation of South Africa (84415). The financial assistance from the University of the Free State is highly recognized.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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