Selective Growth of WSe2 with Graphene Contacts

Abstract

Nanoelectronics of two-dimensional (2D) materials and related applications are hindered with critical contact issues with the semiconducting monolayers. To solve these issues, a fundamental challenge is selective and controllable fabrication of p-type or ambipolar transistors with a low Schottky barrier. Most p-type transistors are demonstrated with tungsten selenides (WSe 2) but a high growth temperature is required. Here, we utilize seeding promoter and low pressure CVD process to enhance sequential WSe 2 growth with a reduced growth temperature of 800°C for reduced compositional fluctuations and high hetero-interface quality. Growth behavior of the sequential WSe 2 growth at the edge of patterned graphene is discussed. With optimized growth conditions, high-quality interface of the laterally stitched WSe 2-graphene is achieved and characterized with transmission electron microscopy (TEM). Device fabrication and electronic performances of the laterally stitched WSe 2-graphene are presented.

Computational investigation on the photovoltaic performance of an efficient GeSe-based dual-heterojunction thin film solar cell

“…Several kinds of p-WSe 2 CVD are reviewed by Cheng et al [38]. These CVD methods are likely to produce a real, high-performance solar cell; however, the costs of CVD production may be prohibitive; therefore, alternative film-growth approaches with lower costs, such as drop cast as used in Si soar cells [39], selenization method [40], and low temperature CVD of WSe 2 [41], may be used. However, there are very few reports of the use of WSe 2 as a back surface field (BSF) layer in GeSe solar cells.…”

Hybrid Alkali Salt Catalysts‐Promoted CVD Growth of 2D MoSe2–WSe2 and WSe2–MoSe2 Lateral Heterostructures

“…Furthermore, PTAS has been used as an aromatic molecule seed at various temperatures growth; it assists the formation of a heterogeneous nucleation (gas and liquid phase), accelerating the growth of the WSe 2 core. [33][34][35][36][37] This hybrid catalyst approach yields lateral heterostructures in both configu- rations, exhibiting similar optoelectronic properties (see Figure S10, Supporting Information). Therefore, we will employ the MoSe 2 -WSe 2 configuration for further analysis.…”

Nano-WSe2 Is Absorbable and Transformable by Rice Plants

“…It is used in photovoltaic devices and ultra-thin LEDs and is an additive in lubricants due to its flake structure with small friction coefficient [11]. The reconfiguration or doping on WSe 2 with other atoms [12] enhances its applications in environmental engineering [13] and chemical engineering [14]. The wide application of nano-WSe 2 increases the possibility of its release into the environment.…”