4.6 Article

Quantum dot sensitized solar cell based on TiO2/CdS/Ag2S heterostructure

期刊

OPTICAL MATERIALS
卷 66, 期 -, 页码 644-650

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2017.03.011

关键词

Quantum dot sensitized solar cell (QDSSC); Successive ionic layer adsorption and reaction (SILAR); CdS/Ag2S; Cascade structure; XPS; Efficiency

资金

  1. Korea Evaluation Institute of Industrial Technology (KEIT) grant - Korea government (MOTIE) [10052824]
  2. Korea Evaluation Institute of Industrial Technology (KEIT) [10052824] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Quantum dot sensitized solar cell (QDSSC) is fabricated based on a stepwise band structure of TiO2/CdS/Ag2S to improve the photoconversion efficiency of TiO2/CdS system by incorporating a low band gap Ag2S QDs. Vertically aligned TiO2 nanorods assembly is prepared by a simple hydrothermal technique. The formation of CdS and Ag2S QDs over TiO2 nanorods assembly as a photoanode is carried out by successive ionic layer adsorption and reaction (SILAR) technique. The synthesized electrode materials are characterized by XRD, XPS, field emission scanning electron microscopy (FE-SEM), Optical, solar cell and electrochemical performances. The results designate that the QDs of CdS and Ag2S have efficiently covered exterior surfaces of TiO2 nanorods assembly. A cautious evaluation between TiO2/CdS and TiO2/CdS/Ag2S sensitized cells tells that CdS and Ag2S synergetically helps to enhance the light harvesting ability. Under AM 1.5G illumination, the photoanodes show an improved power conversion efficiency of 1.87%, in an aqueous polysulfide electrolyte with short-circuit photocurrent density of 7.03 mA cm(-2) which is four fold higher than that of a TiO2/CdS system. (C) 2017 Elsevier B.V. All rights reserved.

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