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Growth and Characterization of Cu2MnSnS4 Thin Films Synthesized by Spray Pyrolysis under Air Atmosphere
Coatings ( IF 3.4 ) Pub Date : 2020-10-09 , DOI: 10.3390/coatings10100963
Sarra Dridi , Eric Aubry , Nabila Bitri , Fatma Chaabouni , Pascal Briois

The direct synthesis of chalcopyrite Cu2MnSnS4 (CMTS) thin films by a spray pyrolysis technique on glass substrates under oxidative conditions (ambient atmosphere and using compressed air as a carrier gas instead of nitrogen) was studied. The effect of the deposition temperature on the structural, chemical composition, and optical and electrical properties of thin films has been assessed. X-ray diffraction study reveals that the tetragonal stannite structure crystallizes with a [112] preferential orientation from 280 up to 360 °C, with its crystallinity correlated with the substrate temperature. However, in addition to its crystallization, traces of secondary phases are observed: a mixture of SnO and CuO at 360 °C prevails on the formation of CuS at 320 °C. Above 360 °C, the oxidant conditions combined with the loss in sulfur lead to the crystallization of only the tenorite CuO. The crystallization of sulfides by spray pyrolysis under air is possible only at relatively low deposition temperature for which the oxidation rate is inefficient compared to the sulfidation rate. Further optical studies of stannite films indicate a high absorption coefficient toward the visible range (>104 cm−1) and an optical band gap of about 1.64–1.85 eV, also depending on the substrate temperature. The CMTS thin films deposited below 360 °C exhibit a moderate electrical resistivity of about Ω·cm at room temperature. The properties of the stannite films synthesized using a spray pyrolysis technique in ambient air are comparable to those of films obtained by spray pyrolysis with nitrogen carrier gas despite the presence of oxides traces, an increase in the deposition temperature improving the microstructure, and its related optical and electrical properties.

中文翻译:

大气条件下喷雾热解法合成Cu2MnSnS4薄膜的生长与表征

黄铜矿Cu 2 MnSnS 4的直接合成研究了在氧化条件(环境气氛和使用压缩空气代替氮气作为载气)下通过喷雾热解技术在玻璃基板上制备的(CMTS)薄膜。已经评估了沉积温度对薄膜的结构,化学组成以及光学和电学性质的影响。X射线衍射研究表明,从280到360°C,四方锡矿结构以[112]优先取向结晶,其结晶度与基板温度相关。但是,除了其结晶外,还观察到了次级相的痕迹:在320°C下形成CuS时,在360°C下存在SnO和CuO的混合物。高于360°C,氧化剂条件与硫的损失相结合,仅导致球铁矿CuO的结晶。仅在相对较低的沉积温度下才可通过空气中的喷雾热解来硫化硫化物的结晶,因为相对于硫化速度而言,氧化温度低。锡石薄膜的进一步光学研究表明,在可见光范围内,吸收系数较高(> 104 cm -1)和大约1.64–1.85 eV的光学带隙,这也取决于基板温度。低于360°C沉积的CMTS薄膜在室温下显示出大约Ω·cm的中等电阻率。尽管存在氧化物痕迹,沉积温度的提高改善了微观结构及其相关的光学性质,但在环境空气中使用喷雾热解技术合成的锡矿薄膜的性能与用氮气载气喷雾热解获得的薄膜的性能相当。和电性能。
更新日期:2020-10-11
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