کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9812433 | 1518113 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Point defects and transport mechanisms in transparent conducting oxides of intermediate conductivity
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Point defects and transport mechanisms in transparent conducting oxides of intermediate conductivity Point defects and transport mechanisms in transparent conducting oxides of intermediate conductivity](/preview/png/9812433.png)
چکیده انگلیسی
The layered delafossite structure p-type transparent conducting oxides (TCOs) and the mayenite cage-structure n-type transparent conducting oxides represent enabling materials for novel technological applications. In the present work, isovalent replacement of the delafossite B-site cation (i.e., B=Sc and Y for Al in CuBO2) and isovalent substitution of the mayenite Ca-cations by Mg in C12A7 (12CaO·7Al2O3) were undertaken to probe the conduction mechanisms and defect structures of these novel materials. Both classes of materials exhibit small polaron conduction with comparable activation energies and conductivities. In the delafossites, increasing B-cation radius increases the hopping energy without changing the pre-exponential factors. An upper limit for mobility is estimated at â¼1 cm2 Vâ1 sâ1 for these materials. In terms of carrier generation mechanisms, there is a changeover from aluminum anti-site/oxygen interstitial associates in CuAlO2 to oxygen interstitials in CuScO2 and CuYO2. In Mg-doped mayenite, substitution produces no change in activation energy but a precipitous drop in the pre-exponential factor. This behavior is linked to magnesium ions blocking critical conduction paths in the mayenite structure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 486, Issues 1â2, 22 August 2005, Pages 86-93
Journal: Thin Solid Films - Volume 486, Issues 1â2, 22 August 2005, Pages 86-93
نویسندگان
B.J. Ingram, M.I. Bertoni, K.R. Poeppelmeier, T.O. Mason,