Recent advances in 2D TMD circular photo-galvanic effects

Abstract

Two-dimensional (2D) layered semiconductors are appealing materials for high-specific-power photovoltaic systems, which is due to their unique optoelectronic properties. 2D materials can be naturally thin, and their properties can be...

Room-Temperature Geometrical Circular Photocurrent in Few-Layer MoS2

“…A promising method to achieve this is by detecting the valley-coupled photocurrent. In particular, due to the coupling between circular polarization and valley in a TMD, valley-coupled photocurrent can manifest as a circular photocurrent (CPC), i.e., the photocurrent that depends on optical chirality. − This correspondence between optical chirality and valley current allows a convenient optical characterization of the valley information in the TMD, underlining the potential of these materials in developing high-performance opto-spintronic and photovoltaic devices . However, although such a method has been demonstrated in monolayer TMD, its demonstration in a more industry-scalable thick-layered TMD material has not been reported.…”

“…12−14 This correspondence between optical chirality and valley current allows a convenient optical characterization of the valley information in the TMD, underlining the potential of these materials in developing high-performance opto-spintronic and photovoltaic devices. 15 However, although such a method has been demonstrated in monolayer TMD, its demonstration in a more industry-scalable thick-layered TMD material has not been reported.…”

Tunable optical bistability of two-dimensional tilted Dirac system

“…Investigations of the nonlinear responses of two-dimensional materials to the light beams have geared up in recent years due to immense applications in optoelectronics like optical switching [1,2], signal processing [3], optical transistors [4], modulators [5], slow light devices [6] and logic gates [7,8]. In particular, research has focused on photovoltaic [9], secondharmonic [10][11][12], third-harmonic [13,14], circular photogalvanic effects [15], etc for time-reversal and inversion symmetric systems [16]. Moreover, the third-order nonlinear optical effects have also been studied in nanostructured systems using the two-wave mixing process considering the first and second harmonic beams [17].…”

Asymmetric contact-induced selective doping of CVD-grown bilayer WS2 and its application in high-performance photodetection with an ultralow dark current

“…There is an ever-growing demand for advancements in the development of energy-efficient optoelectronic devices with low power consumption [1][2][3] for diverse applications ranging from optoelectronics to point-of-care usage. [4][5][6] 2D layered materials such as graphene, transition metal dichalcogenides (TMDs), and MXenes have attracted attention due to their capability to scale down electronic devices to the atomic level.…”