Development and characterization of (Zn,Sn)O thin films for photovoltaic application as buffer layers

被引:3
|
作者
Gnenna, E. [1 ]
Khemiri, N. [1 ]
Kanzari, M. [1 ,2 ]
机构
[1] Univ Tunis EL Manar, Natl Engn Sch Tunis, Photovolta & Semicond Mat Lab, Tunis, Tunisia
[2] Univ Tunis, IPEITunis, Tunis, Tunisia
来源
SN APPLIED SCIENCES | 2020年 / 2卷 / 02期
关键词
ZTO; Thin film; Vacuum thermal evaporation; Annealing process; X-ray diffraction; Band gap energy; Impedance spectroscopy; GROWTH; SN; OPTIMIZATION; PERFORMANCE;
D O I
10.1007/s42452-020-1971-5
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
In order to study the Zinc Tin Oxide (ZTO) as an alternative buffer layer to replace CdS in thin films solar cells, we synthesized the (Zn,Sn)O material using the vacuum thermal evaporation of the metal compounds, Tin and Zinc, followed by annealing treatments. The obtained samples were divided into two groups according to the amount of Tin used during the thermal evaporation while the amount of Zinc remains invariant. The first group of ZTO thin films was made using a Tin amount of 0.312 g and annealed in air at different temperatures (samples A). The second group was made using a less amount of Tin (0.156 g) (samples B). Part of these samples were annealed in air atmosphere (samples B1) whereas the other sample was annealed under vacuum then annealed in air (sample B2). The annealing process was mainly dedicated to the oxidation treatment of Sn/Zn metallic bilayers but it also plays an important role to improve the crystallinity of the as-deposited films. The structural, optical and electrical properties of the prepared films were characterized using X-ray diffraction, UV-VIS-NIR spectrophotometry and impedance spectroscopy, respectively. We have succeeded to obtain a stable cubic spinel structure of Zn2SnO4 phase (sample B2). This thin film showed interesting properties such as a direct band gap energy of value of 3.20 eV, a high optical transmission of 80% and a n-type electrical conductivity.
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页数:9
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