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Exploration of impact of Cr-doping on physical and optical properties of CdS thin films in hybrid photovoltaic cells

Salih Yılmaz, Ahmet Ünverdi, Murat Tomakin, Melek Altay, İsmail Polat, Emin Bacaksız

Abstract


This paper searches for varying Cr-doping on both physical, optical properties of CdS thin films and their photovoltaic applications. CdS:Cr thin films with Cr atoms from 0 to 8% are produced by chemical bath deposition. X-ray diffraction conclusion shows that all samples grow in cubic structure and Cr-doping leads to formation of nanocrystalline CdS structure. Scanning electron microscopy data demonstrates that a reduction in grain size is obtained by Cr-doping. P3HT layer is almost uniformly coated on N3-modified CdS or CdS:Cr surfaces. 2% and 8% Cr-doped CdS thin films exhibit better transparency than that of CdS sample in the visible region. Band gap values increase from 2.98 eV to 3.36 eV when Cr-doping concentration alters from 0% to 4%, which could be probably due to the quantum confinement effect. Absorbance of CdS-based device decreases after Cr-doping. Photoluminescence curves illustrate that peak intensity increases upon Cr-doping that is ascribed to radiative recombination induced by Cr atoms. Photoluminescence data displays that Cr-doped CdS-based devices have higher peak intensity than that of CdS. It is obtained from photovoltaic measurements that CdS-based hybrid solar cell demonstrates a power conversion efficiency of 0.296%. 

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