Broad-Band Photodetector Based on a Lateral MoTe₂ 1T-2H-1T Homojunction

Abstract

The use of a two-dimensional (2D) layered molybdenum ditelluride (MoTe 2 ) nanosheet in electronic devices can be enhanced by transforming its electrode to a metallic phase, forming a 1T-2H-1T heterogeneous structure. This, however, leads to the formation of a junction between the electrode and the channel which can reduce the effectiveness of the device. To address this issue, this paper proposes a novel method of creating 1T-2H-1T MoTe 2 optoelectronic devices using oxygen mild plasma preparation. Transmission electron microscopy testing and first-principles calculations have confirmed that this treatment results in the loss of some Te atoms, thus lowering their energy bands and creating metallic properties. The electrical and optoelectronic performance testing at varying temperatures and wavelengths has revealed improved mobility and responsiveness, with a maximum mobility of 30 cm 2 /V s and a responsivity of 0.6 A/W under a 940 nm laser irradiation, being 25 times higher than the intrinsic one. This research provides an efficient phase engineering technique for the accurate and undamaged fabrication of optoelectronic devices using two-dimensional materials.

Dual Design on Hierarchically Hollow MoTe2/C with Ion/Electron Channel Engineering for High-Performance Sodium Storage

“…As a family member of TMDs, molybdenum telluride (MoTe 2 ) is a very promising type of material for electronic or electrochemical applications. − Similar to its analogues such as MoS 2 and MoSe 2 , MoTe 2 also exhibits excellent sodium-storage performance because of its unique layered structure and rich active sites. − Moreover, MoTe 2 has more potential due to its larger interlayer distance (0.699, 0.646, and 0.615 nm for MoTe 2 , MoSe 2 , and MoS 2 , respectively) and weaker interlayer force, which are beneficial for the rapid Na + intercalation/deintercalation . However, bond breakage and layered structure collapse are also issues that cannot be ignored.…”