Havryliuk Yevhenii, Dzhagan Volodymyr, Karnaukhov Anatolii, Selyshchev Oleksandr, Hann Julia, Zahn Dietrich R T
Semiconductor Physics, Chemnitz University of Technology, 09107 Chemnitz, Germany.
Center for Materials, Architectures, and Integration of Nanomembranes (MAIN), 09126 Chemnitz, Germany.
Nanomaterials (Basel). 2022 Dec 22;13(1):41. doi: 10.3390/nano13010041.
CuZnSnS (CZTS) is an intensively studied potential solar cell absorber and a promising thermoelectric (TE) material. In the form of colloidal nanocrystals (NCs), it is very convenient to form thin films on various substrates. Here, we investigate composites of CZTS NCs with PEDOT:PSS, a widely used photovoltaics polymer. We focus on the investigation of the structural stability of both NCs and polymers in composite thin films with different NC-to-polymer ratios. We studied both pristine films and those subjected to flash lamp annealing (FLA) or laser irradiation with various power densities. Raman spectroscopy was used as the main characterization technique because the vibrational modes of CZTS NCs and the polymer can be acquired in one spectrum and thus allow the properties of both parts of the composite to be monitored simultaneously. We found that CZTS NCs and PEDOT:PSS mutually influence each other in the composite. The thermoelectric properties of PEDOT:PSS/CZTS composite films were found to be higher compared to the films consisting of bare materials, and they can be further improved by adding DMSO. However, the presence of NCs in the polymer deteriorates its structural stability when subjected to FLA or laser treatment.
铜锌锡硫（CZTS）是一种受到广泛研究的潜在太阳能电池吸收体和一种很有前景的热电（TE）材料。以胶体纳米晶体（NCs）的形式，在各种衬底上形成薄膜非常方便。在此，我们研究了CZTS NCs与聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）（一种广泛使用的光伏聚合物）的复合材料。我们专注于研究不同NC与聚合物比例的复合薄膜中NCs和聚合物的结构稳定性。我们研究了原始薄膜以及经过闪光灯退火（FLA）或不同功率密度激光辐照的薄膜。拉曼光谱被用作主要表征技术，因为CZTS NCs和聚合物的振动模式可以在一个光谱中获得，从而能够同时监测复合材料两部分的性质。我们发现CZTS NCs和PEDOT:PSS在复合材料中相互影响。发现PEDOT:PSS/CZTS复合薄膜的热电性能比由纯材料组成的薄膜更高，并且通过添加二甲基亚砜（DMSO）可以进一步提高。然而，聚合物中NCs的存在会使其在接受FLA或激光处理时结构稳定性变差。
