arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2107.05280cond-mat.mtrl-sci
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SnS薄膜中的n型导电

n-type electrical conduction in SnS thin films

Issei Suzuki, Sakiko Kawanishi, Sage R. Bauers, Andriy Zakutayev, Zexin Lin, Satoshi Tsukuda, Hiroyuki Shibata, Minseok Kim, Hiroshi Yanagi, Takahisa Omata

摘要:

由于受主型缺陷的形成焓较低,一硫化锡(SnS)通常表现为p型导电,因此至今还没有得到n型SnS薄膜。本研究首次利用射频磁控溅射技术,在沉积过程中掺杂Cl和硫等离子体源,实现了SnS薄膜的n型导电。N型SnS薄膜在本研究中使用的所有衬底温度(221-341 C)下获得,表现出载流子浓度和霍尔迁移率分别为~2 × 10 18 cm-3和0.1-1 cm V-1 s-1。另一方面,在没有硫等离子体源的情况下制备的膜尽管含有相当量的Cl供体,但仍表现出p型导电。这可能是由于p型薄膜中的硫缺乏引起的大量受体型缺陷,其表现为带隙内的宽光吸收。本研究中的n型SnS薄膜的演示是实现SnS同质结太阳能电池的突破,有望具有比传统异质结SnS太阳能电池更高的转换效率。

英文摘要:

Tin monosulfide (SnS) usually exhibits p-type conduction due to the low formation enthalpy of acceptor-type defects, and as a result n-type SnS thin films have never been obtained. This study realizes n-type conduction in SnS thin films for the first time by using RF-magnetron sputtering with Cl doping and sulfur plasma source during deposition. N-type SnS thin films are obtained at all the substrate temperatures employed in this study (221-341 C), exhibiting carrier concentrations and Hall mobilities of ~2 x 10 18 cm-3 and 0.1-1 cm V-1s-1, respectively. The films prepared without sulfur plasma source, on the other hand, exhibit p-type conduction despite containing a comparable amount of Cl donors. This is likely due to a significant amount of acceptor-type defects originating from sulfur deficiency in p-type films, which appears as a broad optical absorption within the band gap. The demonstration of n-type SnS thin films in this study is a breakthrough for the realization of SnS homojunction solar cells, which are expected to have a higher conversion efficiency than the conventional heterojunction SnS solar cells.

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