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Issue 4, 2014
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8-Hydroxylquinoline-conjugated porphyrins as broadband light absorbers for dye-sensitized solar cells

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Abstract

Three porphyrin dyes, DPZn-HOQ, PZn-HOQ and DPZn-COOH, were synthesized and characterized for dye-sensitized solar cells. Both DPZn-HOQ and DPZn-COOH exhibited a donor–π–acceptor configuration with N,N-dimethylaniline as a donor and 8-hydroxylquinoline (HOQ) and para-benzoic acid (BZA) as acceptors, respectively. PZn-HOQ is an analogue of DPZn-HOQ without a donor. It was found that DPZn-HOQ exhibited broader and stronger light absorption capability in the red region than DPZn-COOH. Theoretical calculations showed that the electrons were delocalized to the 8-hydroxylquinoline ring in DPZN-HOQ. The DPZn-HOQ-sensitized solar cells exhibited higher energy conversion efficiency (3.09%) than DPZn-COOH-sensitized solar cells (1.76%) under the same conditions. The results were consistent with the incident photon to current conversion efficiency (IPCE) spectra. The electrochemical impedance spectroscopy studies revealed that HOQ-conjugated porphyrin exhibited high electron recombination resistance and a long electron lifetime, which was attributed to the effective shielding of DPZn-HOQ from the electrolyte due to its tilted orientation on the surface of TiO2 nanoparticles. The efficiency of DPZn-HOQ-sensitized solar cells was further increased to 3.41% when a complementary dye BET was used.

Graphical abstract: 8-Hydroxylquinoline-conjugated porphyrins as broadband light absorbers for dye-sensitized solar cells

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Publication details

The article was received on 26 Dec 2013, accepted on 28 Jan 2014 and first published on 28 Jan 2014


Article type: Paper
DOI: 10.1039/C3NJ01643A
New J. Chem., 2014,38, 1565-1572

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    8-Hydroxylquinoline-conjugated porphyrins as broadband light absorbers for dye-sensitized solar cells

    L. Si, H. He and K. Zhu, New J. Chem., 2014, 38, 1565
    DOI: 10.1039/C3NJ01643A

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