Electrical, optical and structural properties of Li-doped SnO2 transparent conducting films deposited by the spray pyrolysis technique:: a carrier-type conversion study

被引:120
作者
Bagheri-Mohagheghi, MM [1 ]
Shokooh-Saremi, M
机构
[1] Damghan Univ Sci, Fac Phys, Solid State Phys Res Lab, Damghan, Iran
[2] Ferdowsi Univ Mashhad, Fac Engn, Dept Elect Engn, Mashhad, Iran
[3] Shahrood Univ Technol, Fac Elect Engn & Robot, Shahrood, Iran
关键词
D O I
10.1088/0268-1242/19/6/019
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, we investigate the electrical, optical and structural properties of Li-doped SnO2 transparent conducting films deposited on glass substrates by the spray pyrolysis technique. The SnO2:Li thin films were deposited at a substrate temperature of 480 degreesC using an aqueous ethanol solution consisting of tin and lithium chloride with various doping levels from 0 to 25 wt% in solution. The effect of increasing Li concentration on the electrical, optical and structural properties of SnO2 films has been studied. The results of x-ray diffraction have shown that the deposited films are polycrystalline without any second phases with preferential orientations along the (110) and (211) planes and an average grain size of 28.7 nm. Also, the Hall effect and resistivity measurements of the films show that for a specific acceptor dopant concentration of similar to2 wt% or [Li]/[Sn] atomic ratio equal to 37 at% in solution, the majority of carriers convert from electrons to holes and for a Li concentration of similar to15 wt% in solution, p-conductivity increases sharply. The optical absorption edge for undoped SnO2 films lies at 4.11 eV, whereas for high acceptor doped films it shifts towards lower energies (longer wavelengths) in the range of 4.11 to 3.61 eV.
引用
收藏
页码:764 / 769
页数:6
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