Presentation Information
[11a-A22-4]Terahertz Time-Domain Ellipsometry Study of Ligand-Dependent Electrical Conductive Properties in Colloidal Copper Sulfide Nanocrystal Assemblies
〇(M1)Asato Sakashita1, Daichi Eguchi1,2, Kousaku Kato1, Verdad C. Agulto1, Thanh Nhat Khoa Phan1, Toshiyuki Iwamoto1,3, Nakajima Makoto1 (1.ILE, Univ. Osaka, 2.Grad. Sch. Eng., Univ. Hyogo, 3.Nippo Precision)
Keywords:
THz spectroscopy,nanocrystal,ligand exchange
Colloidal nanocrystals (NCs), which consist of an inorganic core covered with organic ligands, have attracted considerable attention as low-cost printable materials for a wide range of device applications. Colloidal copper sulfide (CuS) NCs have been proposed as promising materials for printable and transparent infrared (IR) optical sensors. Since NCs exist as assemblies in such devices, it is important to investigate the electrical conductive properties. Although terahertz (THz) spectroscopy is a powerful method to investigate the electrical and dielectric properties of materials, those of NC assemblies remain largely unexplored. Furthermore, while surface ligands play a key role in determining these properties, their specific effects, probed by THz spectroscopy, are still unclear. In this study, we investigated the electrical and dielectric properties of CuS NC assemblies with different ligands using terahertz time-domain ellipsometry (THz-TDE).