Band Alignments of GeS and GeSe Materials

Here we present new findings of a comprehensive study of the fundamental physicochemical properties for GeS and GeSe in bulk form. UV and X-ray photoelectron spectroscopies (UPS/XPS) were employed for the experiments, which were carried out on in situ cleaned (100) surfaces free from contamination. This allowed to obtain reliable results, also unchanged by effects related to charging of the samples. The work functions, electron affinities and ionization energies as well as core level lines were found. The band gaps of the investigated materials were determined by photoreflectance and optical absorption methods. As a result, band energy diagrams relative to the vacuum level for GeS and GeSe were constructed. The diagrams provide information about the valence and conduction band offsets, crucial for the design of various electronic devices and semiconducting heterostructures.

Automated summary

In this study, we present new findings on the fundamental physicochemical properties of GeS and GeSe in bulk form. The experimental results obtained using UV and X-ray photoelectron spectroscopies provide reliable values of the work functions, electron affinities and ionization energies, as well as core level lines. The band gaps of the materials were determined by photoreflectance and optical absorption methods, and band energy diagrams relative to the vacuum level were constructed. These diagrams are crucial for the design of various electronic devices and semiconducting heterostructures.