Growth of Multilayer WSe₂/Bi₂O₂Se Heterostructures for Photodetection without Lithography

Abstract

Novel oxychalcogenides, such as Bi 2 O 2 Se, have many applications because of their interesting properties such as remarkable hall mobility, the presence of a bandgap, and high air stability. Among them, photodetectors based on Bi 2 O 2 Se are one of the best applicable devices. In addition, the Bi 2 O 2 Se heterostructure with other 2D materials can enhance the photoresponse of the device. In this study, we successfully fabricated the WSe 2 /Bi 2 O 2 Se heterostructure for photodetector application via in situ pulsed laser deposition. The band alignment of the as-grown WSe 2 /Bi 2 O 2 Se heterostructure was confirmed to be type II, which increases the photoresponse. Furthermore, the WSe 2 /Bi 2 O 2 Se photodetector exhibited an approximately 110% on/off ratio with a photoresponsivity of 0.96 mA/W even without using lithography for its fabrication.

Recent advances in bismuth oxychalcogenide nanosheets for sensing applications

“…In recent years, a few reports published the deposition of Bi 2 O 2 Se thin films by the PLD method. 57,58 Song et al reported the deposition of a single crystalline Bi 2 O 2 Se thin film on a single crystal SrTiO 3 substrate. 58 This technique offers a lower growth temperature for BOXs with good control of thickness and stoichiometry.…”

Fast detection of Staphylococcus aureus using thiol-functionalized WS2 quantum dots and Bi2O2Se nanosheets hybrid through a fluorescence recovery mechanism

“…80 In addition to those sharp peaks, we have observed two additional low-intensity peaks at 159.7 eV and 165.2 eV due to Bi 2 Se 3 bonding. 81…”

Programmable Interfacial Band Configuration in WS2/Bi2O2Se Heterojunctions

“…This arrangement promotes efficient electron–hole separation facilitated by an internal electrical field. This rapid separation process imparts excellent photon responsivity, making type-II heterojunctions ideal candidates for photodetectors and photovoltaic applications. − Hence, achieving a diverse control of band alignment can significantly change the applications of heterojunctions, profoundly influencing their optoelectronic properties.…”