Controlled growth of hematite (α-Fe2O3) nanorod array on fluorine doped tin oxide: Synthesis and photoelectrochemical properties

被引：84

作者：

Mulmudi, H. K. ^{[1
]}

Mathews, N. ^{[1
]}

Dou, X. C. ^{[1
]}

Xi, L. F. ^{[1
]}

Pramana, S. S. ^{[1
]}

Lam, Y. M. ^{[1
]}

Mhaisalkar, S. G. ^{[1
,2
]}

机构：

[1] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore, Singapore

[2] Nanyang Technol Univ, Energy Res Inst NTU ERI N, Singapore, Singapore

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2011年 / 13卷 / 09期

基金：

新加坡国家研究基金会;

关键词：

Hematite nanorods; Electrochemical impedance spectroscopy; Photoelectrochemical solar cell; Minority charge carriers; ELECTRODES; SIZE;

D O I：

10.1016/j.elecom.2011.06.008

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Hematite nanorods were grown on fluorine doped tin oxide (FTO) substrates by hydrothermal means utilizing urea as a pH regulating agent. XRD for nanorods revealed pure hematite phase after annealing at 500 degrees C for 30 min with preferential orientation in the [110] direction. Electrochemical impedance spectroscopy was carried out to investigate the electrical properties. Using Mott-Schottky analysis, charge carrier density was estimated to be 5.62 x 10(19) cm(-3) in the hematite nanorod array. Among the nanostructures, the n-type hematite nanorod array showed the best conversion efficiency among the samples studied in a two electrode photoelectrochemical cell. Photocurrent measurements versus light intensity were performed to investigate the device performance and the limiting factors to the performance were attributed to the short diffusion length of minority charge carriers. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：951 / 954

页数：4

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