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Photodeposition of Ag2S on TiO2 nanorod arrays for quantum dot-sensitized solar cells

Hongwei Hu1, Jianning Ding12*, Shuai Zhang12, Yan Li1, Li Bai1 and Ningyi Yuan12*

Author Affiliations

1 Center for Low-Dimensional Materials, Micro-nano Devices and System, Changzhou University, Changzhou, 213164, China

2 Jiangsu Key Laboratory for Solar Cell Materials and Technology, Changzhou, 213164, China

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Nanoscale Research Letters 2013, 8:10  doi:10.1186/1556-276X-8-10

Published: 3 January 2013

Abstract

Ag2S quantum dots were deposited on the surface of TiO2 nanorod arrays by a two-step photodeposition. The prepared TiO2 nanorod arrays as well as the Ag2S deposited electrodes were characterized by X-ray diffraction, scanning electron microscope, and transmission electron microscope, suggesting a large coverage of Ag2S quantum dots on the ordered TiO2 nanorod arrays. UV–vis absorption spectra of Ag2S deposited electrodes show a broad absorption range of the visible light. The quantum dot-sensitized solar cells (QDSSCs) based on these electrodes were fabricated, and the photoelectrochemical properties were examined. A high photocurrent density of 10.25 mA/cm2 with a conversion efficiency of 0.98% at AM 1.5 solar light of 100 mW/cm2 was obtained with an optimal photodeposition time. The performance of the QDSSC at different incident light intensities was also investigated. The results display a better performance at a lower incident light level with a conversion efficiency of 1.25% at 47 mW/cm2.

Keywords:
Ag2S; Quantum dot-sensitized solar cell; Photodeposition; TiO2 nanorod