Bulletin of Materials Science

, 41:151 | Cite as

Highly enhanced solar conversion efficiency of novel layer-by-layer PbS:Hg and CdS quantum dots-sensitized ZnO thin films prepared by sol–gel spin coating

  • JIGNASA V GOHELEmail author


Owing to superior optical properties, ZnO thin films have immense potential in solar cell preparation. ZnO thin films were prepared by sol–gel technology. However, this is prolonged technique and it necessitates a complex precursor solution. In the present work, ZnO thin films are prepared by sol–gel spin coating with simple precursor, zinc acetate. A very remarkable feature of the method is that polycrystalline, non-abrasive and translucent films were obtained. Additionally, novel PbS:Hg quantum dots (QDs) and CdS QDs are successfully synthesized. Moreover, both types of QDs are deposited layer-by-layer over pure ZnO and Ag:ZnO thin films. The films are characterized by X-ray diffraction, and crystallinity continuation is observed even after the addition of QDs layer. Presence of synthesized QDs over thin films is also confirmed. The films were also characterized by scanning electron microscopy (SEM) and UV–Vis spectroscopy. Uniform, dense and porous surface morphology is clearly revealed. Sensitized thin films show a huge decline in band gap and large enhancement in efficiency. Superior current density (\(10.87~\hbox {mA}~\hbox {cm}^{-2})\) is achieved with PbS:Hg/CdS/Ag:ZnO, which leads to enhancement in overall solar conversion efficiency by 6.34 times.


Ag:ZnO film PbS:Hg quantum dots CdS quantum dots sol–gel 



We would like to thank Chemical Engineering Department, S.V. National Institute, for providing facilities to carry out experimental work and sophisticated analytical instrument facility, S.V. National Institute of Technology, for rendering analytical service for this work.


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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Department of Chemical EngineeringSardar Vallabhbhai National Institute of TechnologySuratIndia

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