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- W2133234562 abstract "We have developed a method of improving minority carrier lifetime by use of HCN treatments. Metal contaminants, Fe, Ni, and Cu, are introduced during slicing Si ingots to produce Si wafers, and also during alkaline etching processes for removal of a damaged layer and formation of mat-textured surfaces. The concentrations of metal contaminants are greatly decreased by cleaning with HCN solutions having pH of 12, while they are decreased only slightly by pH 9 HCN solutions. Two kinds of metal contaminants, i.e., contaminants present deeply in saw damaged regions and on the surface due to re-adsorption during alkaline etching, can be removed by pH 12 HCN solutions while only the latter can be by pH 9 HCN solutions. The minority carrier lifetime is increased by removal of a damaged layer by alkaline etching but decreased below that of as-sliced wafers after formation of mat-textured surfaces. The lifetime is increased by the HCN treatment and it is attributed to i) removal of metal contaminants and ii) passivation of interface states by the formation of Si-CN bonds from Si dangling bonds." @default.
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- W2133234562 date "2013-01-01" @default.
- W2133234562 modified "2023-09-23" @default.
- W2133234562 title "Improvement of Minority Carrier Lifetime by HCN Treatments" @default.
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- W2133234562 doi "https://doi.org/10.1149/2.026307jss" @default.
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