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Issue 46, 2013
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Indolocarbazoles end-capped with diketopyrrolopyrroles: impact of regioisomerism on the solid-state properties and the performance of solution-processed bulk heterojunction solar cells

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Abstract

Two regioisomeric indolo[3,2-b]carbazoles end-substituted with diketopyrrolopyrrole dyes (3,9-TDPPIC and 2,8-TDPPIC) were synthesized, and their solid-state properties and performance as donor materials for bulk heterojunction solar cells using [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) as an acceptor material were evaluated. Depending on the regiochemistry of backbone linkages (3,9- or 2,8-linkage), these two compounds showed quite different solid-state aggregation behaviors (crystalline versus amorphous), leading to a significant difference in the degree of phase separation upon blending with PCBM. As a result, a distinct effect of thermal annealing on the device parameters of solar cells (Voc and Jsc) was observed for these compounds although both the devices showed almost the same power conversion efficiency (PCE) of ca. 0.7% with thermal annealing at 130 °C. For 3,9-TDPPIC, the highest PCE of 1.8% was achieved by further optimization of the device.

Graphical abstract: Indolocarbazoles end-capped with diketopyrrolopyrroles: impact of regioisomerism on the solid-state properties and the performance of solution-processed bulk heterojunction solar cells

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Publication details

The article was received on 03 Jul 2013, accepted on 06 Oct 2013 and first published on 08 Oct 2013


Article type: Paper
DOI: 10.1039/C3TA12579C
Citation: J. Mater. Chem. A, 2013,1, 14686-14691
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    Indolocarbazoles end-capped with diketopyrrolopyrroles: impact of regioisomerism on the solid-state properties and the performance of solution-processed bulk heterojunction solar cells

    X. Lin, Y. Tani, R. Kanda, K. Nakayama and S. Yagai, J. Mater. Chem. A, 2013, 1, 14686
    DOI: 10.1039/C3TA12579C

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