Jump to main content
Jump to site search

Issue 9, 2013
Previous Article Next Article

Application of solution processable squaraine dyes as electron donors for organic bulk-heterojunction solar cells

Author affiliations

Abstract

New low bandgap small molecules based on a squaraine (SQ) chromophore, bis[4-(2,6-di-tert-butyl)vinylpyrylium]squaraine (TBU-SQ), bis[2,6-di-tert-butyl-4-(prop-1-en-2-yl)pyrylium]squaraine (MeTBU-SQ) and bis[4-(but-1-en-2-yl)-2,6-di-tert-butylpyrylium]squaraine (EtTBU-SQ), were synthesized and used as electron donors along with PC70BM for their application in solution processed organic bulk-heterojunction (OBHJ) solar cell (SC). The long wavelength of these SQ dyes are located in between 650–750 nm in thin films and the optical bandgaps are about 1.64, 1.52 and 1.48 eV, respectively. The electrochemical properties of these SQ dyes indicate that they are well suited for the fabrication of OBHJSCs as electron donors along with fullerene derivatives as electron acceptors. The OBHJ photovoltaic (PV) devices fabricated with the blend of TBU-SQ:PC70BM, MeTBU-SQ:PC70BM and EtTBU-SQ:PC70BM cast from chloroform (CF) solvent exhibited a power conversion efficiency (PCE) of 1.71%, 2.15%, and 1.89%, respectively. The PCE of the OBHJSCs based on MeTBU-SQ:PC70BM blends cast from DIO–THF (DIO = 1,8-diiodooctane) additive solvent and cast from DIO–THF with subsequent thermal annealing have been further improved up to 2.73% and 3.14%, respectively. This enhancement in the PCE is attributed to the improvement in the crystalline nature of the blend and more balanced charge transport resulting from the higher hole mobility. All these results have been supported by the quantum chemical calculations.

Graphical abstract: Application of solution processable squaraine dyes as electron donors for organic bulk-heterojunction solar cells

Back to tab navigation

Publication details

The article was received on 13 Mar 2013, accepted on 15 May 2013 and first published on 16 May 2013


Article type: Paper
DOI: 10.1039/C3PP50087J
Photochem. Photobiol. Sci., 2013,12, 1688-1699

  •   Request permissions

    Application of solution processable squaraine dyes as electron donors for organic bulk-heterojunction solar cells

    B. Ananda Rao, K. Yesudas, G. Siva Kumar, K. Bhanuprakash, V. Jayathirtha Rao, G. D. Sharma and S. P. Singh, Photochem. Photobiol. Sci., 2013, 12, 1688
    DOI: 10.1039/C3PP50087J

Search articles by author

Spotlight

Advertisements