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Band alignment of Sb2O3and Sb2Se3
Journal of Applied Physics ( IF 2.7 ) Pub Date : 2021-06-16 , DOI: 10.1063/5.0055366
Huw Shiel 1 , Theodore D. C. Hobson 1 , Oliver S. Hutter 2 , Laurie J. Phillips 1 , Matthew J. Smiles 1 , Leanne A. H. Jones 1 , Thomas J. Featherstone 1 , Jack E. N. Swallow 3 , Pardeep K. Thakur 4 , Tien-Lin Lee 4 , Jonathan D. Major 1 , Ken Durose 1 , Tim D. Veal 1
Affiliation  

Antimony selenide (Sb 2Se 3) possesses great potential in the field of photovoltaics (PV) due to its suitable properties for use as a solar absorber and good prospects for scalability. Previous studies have reported the growth of a native antimony oxide (Sb 2O 3) layer at the surface of Sb 2Se 3 thin films during deposition and exposure to air, which can affect the contact between Sb 2Se 3 and subsequent layers. In this study, photoemission techniques were utilized on both Sb 2Se 3 bulk crystals and thin films to investigate the band alignment between Sb 2Se 3 and the Sb 2O 3 layer. By subtracting the valence band spectrum of an in situ cleaved Sb 2Se 3 bulk crystal from that of the atmospherically contaminated bulk crystal, a valence band offset (VBO) of 1.72 eV is measured between Sb 2Se 3 and Sb 2O 3. This result is supported by a 1.90 eV VBO measured between Sb 2O 3 and Sb 2Se 3 thin films via the Kraut method. Both results indicate a straddling alignment that would oppose carrier extraction through the back contact of superstrate PV devices. This work yields greater insight into the band alignment of Sb 2O 3 at the surface of Sb 2Se 3 films, which is crucial for improving the performance of these PV devices.

中文翻译:

Sb2O3和Sb2Se3的能带对齐

硒化锑(Sb 2 3)由于其适合用作太阳能吸收器的特性和可扩展性的良好前景,在光伏(PV)领域具有巨大潜力。先前的研究报告了天然氧化锑(Sb 2 3) 层在 Sb 表面 2 3 沉积过程中的薄膜和暴露在空气中,这会影响 Sb 之间的接触 2 3和后续层。在这项研究中,光电发射技术被用于 Sb 2 3 大块晶体和薄膜来研究 Sb 之间的能带排列 2 3 和 Sb 2 3层。通过减去原位裂解的 Sb的价带谱 2 3 来自大气污染块状晶体的块状晶体,价带偏移(VBO)为 - 1.72 eV 是在 Sb 之间测量的 2 3 和锑 2 3. 这一结果得到了一个 - 1.90 在 Sb 之间测量的 eV VBO 2 3 和锑 2 3通过 Kraut 方法制备薄膜。这两个结果都表明跨越式排列会阻碍载流子通过顶板 PV 器件的背接触提取。这项工作更深入地了解 Sb 的带对齐 2 3 在 Sb 表面 2 3 薄膜,这对于提高这些光伏器件的性能至关重要。
更新日期:2021-06-21
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