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首页> 外文期刊>Journal of Applied Physics >Structure and optical band gap of ZnO_(1-x)S_x thin films synthesized by chemical spray pyrolysis for application in solar cells
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Structure and optical band gap of ZnO_(1-x)S_x thin films synthesized by chemical spray pyrolysis for application in solar cells

机译：化学喷雾热解合成ZnO_（1-x）S_x薄膜的结构和光学带隙在太阳能电池中的应用

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摘要

Highly crystalline c-axis oriented and homogeneous ZnO_(1-x)S_x films with sulfur composition 0.05 ≤ x ≤ 0.9 without phase separation were deposited using spray pyrolysis of aqueous precursors. A mechanism of film growth is proposed which envisages a slower kinetics of ZnO precursor decomposition and its specific by-products combined with S-precursor decomposition which enables homogeneous ZnO_(1-x)S_x phase formation over a wide S-composition range 0.05 ≤ x ≤ 0.9. This is achieved by controlling the substrate temperature to ≤ 300 ℃ and the spray rate at ~ 3ml/min. The ZnO_(1-x)S_x films primarily form by S~(2-) substitution at the O~(2-) lattice sites which is confirmed by detailed analysis of the Zn2p, S2p and Ols x-ray photoelectron spectroscopy peaks. With the increasing of S-content, a structural transformation is observed in ZnO_(1-x)S_x films; for x<0.3, the ZnO_(1-x)S_x films in the oxygen-rich phase are in ZnO wurtzite crystal structure and for x≥0.44, the ZnO_(1-x)S_x films lie in the sulfur-rich phase with β-ZnS structure. At threshold x = 0.3, in the structural transition state, diffraction peaks corresponding to both structural phases are observed. The optical transmission spectra at the band gap transition energy position shift to the red side for 0.05 ≤ x < 0.52 and towards the blue side with the further increase in S-content in the 0.52 < x ≤ 0.9 range. Optical band gap energy determined for ZnO_(1-x)S_x films show strong band gap bowing over the entire S-composition range, 0.05 ≤ x ≤ 0.9. The band gap modulation with increased S-content is inconsistent with the use of a single bowing parameter. A bowing parameter of 2.5 eV shows a closer fit for 0.05 ≤ x < 0.52. By accounting for additional effect of the strain energy on the band gap due to addition of excess S-content, a closer fit for the observed variation in the band gap is explained in the 0.52
机译：使用含水前驱物的喷雾热解沉积了高结晶度的c轴取向且均质的ZnO_（1-x）S_x膜，其硫成分为0.05≤x≤0.9，没有相分离。提出了一种膜生长机制，该机制设想了ZnO前体分解及其特定副产物与S前体分解相结合的动力学较慢，这使得能够在宽的S组成范围内形成ZnO_（1-x）S_x相均匀，且≤0.05 ≤0.9。这是通过将基材温度控制在≤300℃并将喷涂速度控制在〜3ml / min来实现的。 ZnO_（1-x）S_x薄膜主要由O〜（2-）晶格处的S〜（2-）取代形成，这通过对Zn2p，S2p和Ols X射线光电子能谱峰的详细分析得到证实。随着S含量的增加，在ZnO_（1-x）S_x薄膜中观察到结构转变。当x <0.3时，富氧相中的ZnO_（1-x）S_x薄膜为锌酸锌纤锌矿晶体结构，当x≥0.44时，ZnO_（1-x）S_x膜中的富硫相为β -ZnS结构。在阈值x ＝ 0.3时，在结构转变状态下，观察到与两个结构相对应的衍射峰。在0.05≤x <0.52的带隙跃迁能量位置处，随着S含量在0.52

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  • 来源
    《Journal of Applied Physics》 |2012年第6期|p.063708.1-063708.10|共10页
  • 作者

    Ratheesh R. Thankalekshmi; A. C. Rastogi;

  • 作者单位

    Electrical and Computer Engineering Department, Center for Autonomous Solar Power (CASP), Binghamton University, State University of New York, Binghamton, New York 13902, USA;

    Electrical and Computer Engineering Department, Center for Autonomous Solar Power (CASP), Binghamton University, State University of New York, Binghamton, New York 13902, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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