Sulfur-K X-Ray Spectra and Electronic Structure of a Semiconductor Ag₂S

Abstract

The Kβ emission and K-absorption spectra of sulfur in Ag2S are carefully measured and compared with the sulfur Kβ emission and K-absorption spectra of Cu1.8S reported previously. The spectra of Ag2S clearly show the existence of the energy gap in semiconducting Ag2S in contrast to the metallic phase Cu1.8S where the Kβ band edge overlaps with the K absorption edge. The sulfur-Kβ emission spectrum of Ag2S consists of two prominent peaks. The intensity of the high-energy peak is much greater than that of the low-energy peak, contrary to the sulfur-Kβ emission spectrum of Cu1.8S. It is suggested that the bottom of the conduction band of Ag2S arises mainly from the sulfur 4p states.

On the Reactivity of Sulfosalts in Cyanide Aqueous Media: Structural, Bonding and Electronic Aspects

“…This process involve the S 3p states of the highest occupied orbital of the VB. [39] Consequently, the anodic peaks of the polarization curve are due to superficial oxidation of S species from a-Ag 2 S (Figure 8 a). Therefore, it is assumed that the initial oxidation of the Ag 3 AsS 3 -Ag 3 SbS 3 series (Figures 8 d-g) corresponds to the oxidation of sulfur species.…”

Pressure tuning the lattice and optical response of silver sulfide

“…10,11 In contrast, Ag 2 S is a semiconductor with band-gap ~ 1 eV. 12,13 Ag 2 S devices enable fabrication of quantized conductance atomic switches that can largely overcome the limitation of current semiconductor devices 14 and Ag 2 S quantum dots can be applied in high sensitivity cancer imaging. 15 The ability to tune semiconductors' electronic structures away from their pristine states is fundamental to semiconductor research, because this capability could lead to novel electronics and opto-electronics applications.…”

Classification of direct optical signal inputs by Ag2S island network reservoir

“…Ag 2 S has been used to demonstrate various functions, such as switching among quantized conductances, 28) short-term plasticity, long-term potentiation-based learning, 29) and volatile and non-volatile selective switching. 30) Since Ag 2 S is an n-type semiconductor with a band gap of about 1 eV, 31,32) excitation of electrons in the valence band to the conduction band, such as by light irradiation, increases the conductivity of the material. In fact, several studies have been conducted on Ag 2 S-based optical sensing devices.…”