Photoelectrical properties of CdS/CdSe core/shell QDs modified anatase TiO2 nanowires and their application for solar cells.

Anatase TiO2 nanowire (NW) films modified with inverted type-I CdS/CdSe core/shell structure QDs have been successfully prepared by the post synthesis ligand-assisted technique. Surface photovoltage (SPV), transient photovoltage (TPV) and transient photocurrent (TPC) measurements demonstrate that CdS/CdSe core/shell structure QD-sensitized TiO2 NWs electrodes favor photoexicited electron injection and charge transfer due to the special photo-electronic features of CdS/CdSe core/shell structure QDs. With a polysulfide electrolyte, the maximum conversion efficiency was 2.18% for CdS/CdSe QDs with the CdSe shell being 4.4 nanometers thick; a PCE of 0.07% for CdS QDs and a PCE of 0.63% for CdSe QDs were obtained under illumination at 100 mW cm-2. The results reveal that the CdS/CdSe core/shell structure QDs sensitized TiO2 NW electrodes have promising applications in solar cells.

Citation

Qingqing Qiu, Ping Wang, Lingling Xu, Dejun Wang, Yanhong Lin, Tengfeng Xie. Photoelectrical properties of CdS/CdSe core/shell QDs modified anatase TiO2 nanowires and their application for solar cells. Physical chemistry chemical physics : PCCP. 2017 Jun 21;19(24):15724-15733

PMID: 28597886

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