Abstract
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.
Original language | English |
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Pages (from-to) | 644-650 |
Number of pages | 7 |
Journal | Optical Materials |
Volume | 66 |
DOIs | |
State | Published - 1 Apr 2017 |
Keywords
- Cascade structure
- CdS/AgS
- Efficiency
- Quantum dot sensitized solar cell (QDSSC)
- Successive ionic layer adsorption and reaction (SILAR)
- XPS