Tasaki Takeshi, Jimbo Kazuo, Motai Daiki, Takahashi Masaya, Araki Hideaki
National Institute of Technology (KOSEN), Nagaoka College, Nagaoka 940-8532, Japan.
Materials (Basel). 2024 Apr 19;17(8):1886. doi: 10.3390/ma17081886.
CuSnGeS (CTGS) is a compound composed of relatively abundant elements in the crust of the earth. The band gap of CTGS can be tuned by substituting elements at the Sn and Ge sites, making it an attractive material for low-environmental-impact solar cells. In this study, CTGS thin films were fabricated with a controlled [Ge]/([Ge] + [Sn]) composition ratio (x) by combining the co-evaporation method and sulfurization in an infrared furnace. Furthermore, the effect of Na on the CTGS and changes in the solar cell properties were investigated by stacking and sulfurizing NaF on the precursor fabricated using the co-evaporation method. As a result, CTGS with varying x was successfully fabricated by varying the deposition time of the CuGeS layer using co-evaporation. Additionally, CTGS prepared by doping with Na showed enlarged CTGS crystals compared to Na-free CTGS. The fabricated CTGS solar cells achieved a power conversion efficiency of more than 4.5% after doping with Na.
CuSnGeS（CTGS）是一种由地壳中相对丰富的元素组成的化合物。CTGS的带隙可以通过在Sn和Ge位点上进行元素替代来调节，这使其成为用于低环境影响太阳能电池的有吸引力的材料。在本研究中，通过将共蒸发法与在红外炉中硫化相结合，制备了具有可控[Ge]/([Ge] + [Sn])组成比（x）的CTGS薄膜。此外，通过在使用共蒸发法制备的前驱体上堆叠并硫化NaF，研究了Na对CTGS的影响以及太阳能电池性能的变化。结果，通过改变共蒸发法中CuGeS层的沉积时间，成功制备了具有不同x的CTGS。此外，与无Na的CTGS相比，通过Na掺杂制备的CTGS显示出更大的CTGS晶体。在进行Na掺杂后，所制备的CTGS太阳能电池实现了超过4.5%的功率转换效率。
