Chemical bath deposition of nanocrystalline (111) textured Ag₂Se thin films

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• 作者：Pejova ; Biljana ; Najdoski ; Metodija ; Grozdanov ; Ivan ; Dey ; Sandwip K.
• 关键词：Ag₂Se films ; Chemical bath deposition ; Semiconductors ; Textured thin films ; Nanocrystalline thin films ; Size quantization effects
• 刊名：Materials Letters
• 出版年：2000
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：May, 2000
• 卷：43
• 期：5-6
• 页码：269-273
• 文件大小：81.3 K

摘要

An inexpensive chemical bath technique for nanocrystalline Ag₂Se thin films deposition on transparent polyester sheets is developed. The deposition process is essentially based on a hydrolytic decomposition of selenosulfate. The deposited films were characterized by X-ray analysis, and also optical and electrical investigations were performed. X-ray analysis of the films confirmed that the deposited material is (111) textured silver selenide, with an average crystal size of 9.2 nm. The sheet resistance of the annealed films is about 10 Ω/square, while for the as-deposited ones, it is about 20 times higher. The optical investigations show that the films exhibit gradually increasing transparency in the 320–820 nm region. Using the optical absorption data, the optical band gap for the deposited thin films was determined to be 1.8 eV. Such somewhat higher value than the previously reported ones is attributed to size quantization effects.