Synthesis and study of low-bandgap polymers containing the diazapentalene and diketopyrrolopyrrole chromophores for potential use in solar cells and near-infrared photodetectors

Gang Qian, Ji Qi, Zhi Yuan Wang

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

The two pairs of structurally related donor-acceptor polymers (P1-P4) derived from diketopyrrolopyrrole (DPP) and diazapentalene (DAP) building blocks were synthesized and compared for their optical and photovoltaic properties with potential applications in solar cells and near-infrared (NIR) photodetectors. Having the electron-rich fluorene and bis(2′-thienyl) pyrrole (TPT) units as donors, the synthesized donor-acceptor polymers have band gap levels in the range 1.22-1.79 eV. The solar cells based on the blend of P2 (DPP-TPT polymer) and PC 71BM exhibited the best performance, showing a V oc of 0.61 V, J sc of 10.38 mA cm -2, FF of 0.44 and PCE of 2.8%. The photodetector based on the NIR-absorbing P4 (DAP-TPT polymer) displayed a good photovoltaic response over a wide spectral range of 400-1100 nm and an EQE of 13% and detectivity of 2.3 × 10 10 Jones at 800 nm.

Original languageEnglish (US)
Pages (from-to)12867-12873
Number of pages7
JournalJournal of Materials Chemistry
Volume22
Issue number25
DOIs
StatePublished - Jul 7 2012

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