TiO2 photoanode sensitized with nanocrystalline Bi2S3: the effect of sensitization time and annealing on its photovoltaic performance

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• 作者：Anil N. Kulkarni ; M. B. Rajendra Prasad ; Habib M. Pathan…
• 关键词：Bi2S3 ; Photosensitization ; TiO2 ; Heterojunction ; Solar cell
• 刊名：Applied Nanoscience
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：6
• 期：4
• 页码：567-574
• 全文大小：1,764 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Nanotechnology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：2190-5517

文摘

This work deals with the sensitization of the porous TiO₂ films of thickness about 4 µm deposited on fluorine-doped tin oxide with nanocrystalline Bi₂S₃ for photovoltaic application. The sensitization was achieved for four different sensitization times employing chemical solution deposition with bismuth nitrate and sodium thiosulphate as precursors for Bi3+ and S2−, respectively. The unsensitized and sensitized photoelectrodes were characterized using X-ray diffractometry, scanning electron microscopy and diffused reflectance spectroscopy. XRD patterns show the signatures of both anatase TiO₂ and orthorhombic Bi₂S₃ in the sensitized photoanodes. However, crystallinity of Bi₂S₃ increased with increase in sensitization time from 10 to 40 min. The temporal effect of sensitization and annealing on the photovoltaic performance of the solar cells fabricated using four different photoelectrodes was studied using the photocurrent density versus photovoltage curves. Annealing apparently improved the photovoltaic performance of photoanodes. The best performance was obtained for cell fabricated using annealed TiO₂/Bi₂S₃ photoanode after 30 min sensitization time showing V _oc ~ 0.37 mV, J _sc ~ 0.52 mA/cm2, FF ~ 68 and 0.43 %.