کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5369471 | 1388433 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Electrodeposition and characterization of thin selenium films modified with lead ad-atoms Electrodeposition and characterization of thin selenium films modified with lead ad-atoms](/preview/png/5369471.png)
The deposition and characterization of Se films doped with Pb underpotentially deposited (UPD) ad-atoms was studied in this work. The employed experimental techniques were cyclic voltammetry, chronoamperometry, electrochemical impedance spectroscopy, UV-vis spectroscopy and atomic force microscopy. The initial deposition of Se film by chronoamperometry yielded a thin film composed of approximately 700 layers. The Pb UPD on Se was achieved by chronoamperometry in a potential value previously determined in voltammetric experiments. This deposition yielded a deposition charge of approximately 7.5% of the total one. The film resistance altered from 320 Ω cmâ2 for Se to 65 Ω cmâ2 for the Se/Pb one. Flat band potential values and number of acceptors and donors were also calculated for both films and the values obtained were +0.95 and â0.51 V for Se and Se/Pb, respectively. The Se coating presented 1.2 Ã 1017 cmâ3 acceptors while the Se/Pb one presented 3.2 Ã 1017 cmâ3 donors. The band gap values for both films were 2.4 eV and 1.9 eV, correspondingly.
Journal: Applied Surface Science - Volume 254, Issue 17, 30 June 2008, Pages 5612-5617