Effect of annealing on photovoltaic characteristics of nanostructured p-Cu₂S/n-CdS thin film

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• 作者：Vidya S. Taur^a ; Rajesh A. Joshi^a ; Anil V. Ghule^b ; Ramphal Sharma^a ;   ; ^{rps.phy@gmail.com} ;   ; ^{ramphalsharma@yahoo.com}
• 关键词：Nanostructured heterojunction ; Thin films ; Ion exchange reaction ; Structural properties ; Photovoltaic applications
• 刊名：Renewable Energy
• 出版年：2012
• 出版时间：February 2012
• 年：2012
• 卷：38
• 期：1
• 页码：219-223
• 全文大小：737 K

文摘

Nanostructured heterojunction solar cells of CdS/Cu₂S were grown by simple chemical ion exchange reaction by immersing the CdS thin films in Cu ion solution at room temperature. The as-grown nanostructured thin films were annealed at 250?¡ãC in air for improving the interface and crystallinity of the heterojunction. These as grown and annealed nanostructured heterojunction were characterized for photovoltaic and other optoelectronic characteristics. Increase in conversion efficiency is obtained from annealed (¦Ç?=?0.24 % ) than the as grown heterojunction (¦Ç?=?0.09 % ), on illuminating to 100?mW/cm² light source. The X-ray diffraction (XRD) pattern confirms improvement in crystallinity with increase in crystallite size from 29 to 32?nm on annealing. The optical absorbance strength observed to be increased along with red shift in energy band gap value from E_g?=?2.02?.20?eV after annealing.