Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 776, Issue -, Pages 1056-1062Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.10.285
Keywords
Ni-doped CdS thin films; Chemical bath deposition technique; Structural properties; Refractive index; Heterostructure ideality factor; Solar cell efficiency
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Funding
- Research Center for Advanced Material Science (RCAMS) at King Khalid University, Abha, Saudi Arabia [RCAMS/KKU/008-18]
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In the present work a cheap chemical bath deposition technique has been employed to prepare Ni-doped CdS (Ni: CdS) thin films and Ni: CdS/p-Si heterojunctions using different Ni concentrations varied from 0 to 7 wt %. The X-ray diffraction study confirms the cubic crystal structure for CdS and Ni: CdS thin films. The linear optical parameters of the CdS and Ni: CdS thin films were estimated via the transmission and reflection measurements at the wavelength range 400-2500 nm. The optical band gap was evaluated for the CdS and Ni: CdS thin films via Tauc's extrapolation procedure and were located to decrease from 2.49 to 2.21 by increasing the Ni doping concentrations from 0 to 7 wt %. The dark and illuminated currentvoltage characteristics of the Ni: CdS/p-Si heterojunctions were studied at a temperature of 300 K. The influence of Ni doping concentration on the heterostructure parameters of the Ni: CdS/p-Si heterojunctions has been studied using thermionic emission theory. The ideality factor (n) of the fabricated Nidoped CdS/p-Si heterojunctions were decreased from 3.46 to 2.59 by increasing the Ni doping concentration from 0 to 7 wt %. Both of sheet and shunt resistances were decreased by increasing the Ni doping concentration. The J-V measurements indicate that addition of Ni-doping to the CdS/p-Si heterojunction improve the photovoltaic parameters like the fill factor (FF), open circuit voltage (V-OC), and the solar efficiency (eta). (C) 2018 Published by Elsevier B.V.
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