Flat-band potential of a semiconductor: using the Mott-Schottky equation

被引:1033
作者
Gelderman, K. [1 ]
Lee, L. [1 ]
Donne, S. W. [1 ]
机构
[1] Univ Newcastle, Discipline Chem, Callaghan, NSW 2308, Australia
关键词
D O I
10.1021/ed084p685
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this experiment, suitable for fourth-year undergraduate and graduate students, we have explored the nature of semiconductor materials through determination of the flat-band potential using the Mott-Schottky equation. Experimentally, a technique was developed for preparing a suitable polycrystalline ZnO electrode for study. Note that a similar approach could be used for other semiconductor electrodes. Electrochemical impedance spectroscopy was then employed to examine the semiconductor-electrolyte, 7 × 10-4 M K3[Fe(CN)6] (1 M KCl), interface as a function of applied voltage. To achieve this a modified Randle's circuit was developed to interpret the impedance data, from which a value for the interfacial capacitance was determined. A Mott-Schottky plot was then constructed that allowed a flat-band potential of -0-316 ± 0.033 V versus SCE to be determined. The number of carriers, ND, was also determined: ND = 2 × 1024 m-3. Both results were comparable to literature data emphasizing the soundness of the technique.
引用
收藏
页码:685 / 688
页数:4
相关论文
共 10 条
[1]  
Bockris J.O., 1970, Modern Electrochemistry, V1, DOI [10.1007/978-1-4615-8600-5, DOI 10.1007/978-1-4615-8600-5]
[2]  
Bockris J. OM., 1970, Modern electrochemistry: an introduction to an interdisciplinary area [by], V2
[3]  
Boukamp B.A., 1986, SOLID STATE IONICS, V20, P30
[4]   A PACKAGE FOR IMPEDANCE ADMITTANCE DATA-ANALYSIS [J].
BOUKAMP, BA .
SOLID STATE IONICS, 1986, 18-9 (pt 1) :136-140
[5]   MECHANISM OF CATHODIC PROCESSES ON SEMICONDUCTOR ZINC OXIDE [J].
FREUND, T ;
MORRISON, SR .
SURFACE SCIENCE, 1968, 9 (01) :119-&
[6]  
Macdonald J. R., 1987, IMPEDANCE SPECTROSCO
[7]  
Morrison SR, 1980, US
[8]   KINETICS OF RAPID ELECTRODE REACTIONS [J].
RANDLES, JEB .
DISCUSSIONS OF THE FARADAY SOCIETY, 1947, 1 :11-19
[9]  
SHOCKLEY WB, 1998, P ELECTROCHEM SOC, V981, P26
[10]  
West AnthonyR., 1984, SOLID STATE CHEM ITS