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Issue 16, 2014
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High performance photoelectrochemical hydrogen generation and solar cells with a double type II heterojunction

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Abstract

We report on the fabrication of CdSe quantum dot (QD) sensitized electrodes by direct adsorption of colloidal QDs on mesoporous TiO2 followed by 3-mercaptopropionic acid (MPA) ligand exchange. High efficiency photoelectrochemical hydrogen generation is demonstrated by means of these electrodes. The deposition of ZnS on TiO2/CdSe further improves the external quantum efficiency from 63% to 85% at 440 nm under −0.5 V vs. SCE. Using the same photoelectrodes, solar cells with the internal quantum efficiency approaching 100% are fabricated. The ZnS deposition increases the photocurrent and chemical stability of the electrodes. Investigation of the carrier dynamics of the solar cells shows that ZnS enhances the exciton separation rate in CdSe nanocrystals, which we ascribe to the formation of a type II heterojunction between ZnS and CdSe QDs. This finding is confirmed by the dynamics of the CdSe photoluminescence, which in the presence of ZnS becomes noticeably faster.

Graphical abstract: High performance photoelectrochemical hydrogen generation and solar cells with a double type II heterojunction

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Publication details

The article was received on 31 Dec 2013, accepted on 21 Feb 2014 and first published on 21 Feb 2014


Article type: Paper
DOI: 10.1039/C4CP00632A
Citation: Phys. Chem. Chem. Phys., 2014,16, 7531-7537
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    High performance photoelectrochemical hydrogen generation and solar cells with a double type II heterojunction

    L. Lai, W. Gomulya, L. Protesescu, M. V. Kovalenko and M. A. Loi, Phys. Chem. Chem. Phys., 2014, 16, 7531
    DOI: 10.1039/C4CP00632A

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