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BODIPY-diketopyrrolopyrrole-porphyrin conjugate Small Molecules for Use in Bulk Heterojunction Solar Cells

Abstract

Two small molecules denoted as BD-pPor and BD-tPor composed of a central BODIPY core, surrounded with two DPP and two porphyrin units have been designed and synthesized. In BD pPor and BD-tPor, porphyrins are linked to the central BODIPY by phenyl and thiophene bridges, respectively. The optical and electrochemical properties were systematically investigated in order to employ them as donor along with PC71BM as acceptor, for the solution processed bulk heterojunction organic solar cells. After the optimization of the active layer, the organic solar cells based on BD-pPor and BD-tPor exhibit overall power conversion efficiencies of 6.67% and 8.98% with energy loss of 0.63 eV and 0.50 eV. The low value of energy loss for BD-tPor may be related to the low LUMO offset between the BD-tPor and PC71BM (0.31 eV) as compared to that between BD-pPor and PC71BM (0.36 eV). The low energy loss also leads to the higher value of open-circuit voltage for BD-tPor based OSC than BD-pPor counterpart, despite of slightly deeper HOMO energy level of BD-pPor. The enhanced values of Jsc and FF of the BD-tPor based OSCs may be related to the better exciton dissociation and charge transport, as confirmed from the PL spectra and charge carrier mobility. These results indicate that combination of BODIPY, DPP and Porphyrin in a same conjugate is very promising for the small molecule organic solar cells.

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Publication details

The article was received on 07 Feb 2018, accepted on 06 Apr 2018 and first published on 10 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01291A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    BODIPY-diketopyrrolopyrrole-porphyrin conjugate Small Molecules for Use in Bulk Heterojunction Solar Cells

    G. D. Sharma, L. Bucher, N. Desbois, E. Koukaras, C. H. Devillers, S. Biswas and C. P. Gros, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01291A

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