PbS Quantum Dots/ZnO Nanosheets Composite Films: Preparation and Photoelectrochemical Performance

doi:10.3724/SP.J.1077.2012.00059

Journal of Inorganic Materials ›› 2012, Vol. 27 ›› Issue (1): 59-63.DOI: 10.3724/SP.J.1077.2012.00059

• Orginal Article • Previous Articles Next Articles

PbS Quantum Dots/ZnO Nanosheets Composite Films: Preparation and Photoelectrochemical Performance

LIAO Xin¹, YANG Feng¹, PU Ming-Hua¹, ZHAO Yong^1,2, CHENG Cui-Hua^1,2

(1. Superconductivity and New Energy R&D Center (SRDC), Key Laboratory of Advanced Technology of Materials (Ministry of Education), Southwest Jiaotong University, Chengdu 610031, China; 2. School of Materials Science and Engineering, University of New South Wales, Sydney 2052, NSW, Australia)

Received:2011-04-02 Revised:2011-05-12 Published:2012-01-09 Online:2011-12-19
Supported by:
National Natural Science Foundation of China (50588201, 50872116);Fundamental Research Funds for the Central Universities (2009QK46, SWJTU09ZT24);National High-tech R&D Program of China (863 Program) (2007AA03Z203);Research Fund for the Doctoral Program of Higher Education of China (SRFDP200806130023);the PCSIRT of the Ministry of Education of China (IRT0751)

Abstract

Abstract:

PbS quantum dots(QDs)/ZnO nanosheets composite films were synthesized via a two-step method. ZnO nanosheet films were firstly grown on fluorine-doped SnO₂ conducting glass(FTO) by electrodeposition techniques, then PbS QDs were decorated on ZnO nanosheets to form composite films by sequential chemical bath deposition. The morphology and crystalline phase of obtained films were detailedly characterized by scanning electron microscope (SEM), X-ray diffraction (XRD). The UV-Vis absorption, photoelectrochemical and surface photovoltage properties of ZnO nanosheets and PbS QDs/ZnO nanosheets composite films were investigated respectively. The results show that the absorption and surface photovoltage response region of PbS QDs/ZnO nanosheets composite films are more abroad than that of pristine ZnO nanosheets, extended from UV to visible light region. The photoelectrochemical property of PbS QDs/ZnO nanosheets composite films is dramatically enhanced compared to non-decorated ZnO nanosheets films, from 0.1 to 0.7 mA/cm² of short circuit current density (J_sc), from 0.04% to 0.57% of convert efficiency. Compared with ZnO nanosheets, the surface photovoltage response intensity is enhanced in PbS QDs/ZnO nanosheets, indicating heterojunction formed between PbS and ZnO. Photo-generated charge can effectively separate through this heterojunction, that is the reason for enhancement in photoelectric properties of PbS QDs/ZnO nanosheets composite films.

Key words: ZnO nanosheets, PbS quantum dots, quantum dots sensitized solar cells

CLC Number:

TQ174

LIAO Xin, YANG Feng, PU Ming-Hua, ZHAO Yong, CHENG Cui-Hua. PbS Quantum Dots/ZnO Nanosheets Composite Films: Preparation and Photoelectrochemical Performance[J]. Journal of Inorganic Materials, 2012, 27(1): 59-63.

Figures/Tables 5

Fig. 1 XRD patterns of as-prepared ZnO nanosheets

Fig. 2 SEM images of ZnO nanosheets

Fig. 3 UV-visible spectra of ZnO nanosheets

Fig. 4 I-V curves of ZnO nanosheets

Fig. 5 Surface photovoltage spectra of ZnO nanosheets

References 18

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PbS Quantum Dots/ZnO Nanosheets Composite Films: Preparation and Photoelectrochemical Performance

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