2D Oxides for Electronics and Optoelectronics

Abstract

In recent years, 2D oxides have attracted considerable attention due to their novel physical properties and excellent stability. With the efforts of researchers, significant progress has been made in the synthesis and electronics and optoelectronics application of 2D oxides. Herein, a systematic review focusing on the preparation of 2D oxides and their applications in electronics and optoelectronics is provided. First, 2D oxides are summarized and classified according to their elements. Then, common preparation methods to synthesize 2D oxides including exfoliation, liquid‐phase synthesis, vapor deposition, surface oxidation of metal, and so on are introduced. Further, the applications of 2D oxides in electronics and optoelectronics are presented. Finally, the current challenges and envisioned development of 2D oxides are commented and prospected.

Charge Steering in Heterojunction Photocatalysis: General Principles, Design, Construction, and Challenges

“…Graphene is a well-known material that possesses high surface area, high conductivity, and good adsorptive properties; these lead to improved accumulation of charge and effective charge separation. [20,[59][60][61][62][63][64] Williams et al synthesized a photoactive graphene-TiO 2 nanocomposite with graphene oxide (GO) suspended in ethanol. Upon UV light irradiation, photoexcited electrons transferred from TiO 2 to GO; this was confirmed by the reduction accompanying changes in the absorption of the GO, as evidenced by the shift in color of the suspension from brown to black.…”

“…Graphene is a well‐known material that possesses high surface area, high conductivity, and good adsorptive properties; these lead to improved accumulation of charge and effective charge separation. [ 20,59–64 ]…”

“…[16,17] In general, low-dimensional materials have shown appreciable differences in minimizing the recombination rate of electron-hole pairs as well as other electronic, catalytic, optical, and mechanical properties compared to their bulk counterparts. [18][19][20][21][22][23][24] Overall, the key issues for enhancing photocatalytic performance are the improvement of the light absorption characteristics of catalytic systems, the enhancement of the separation of effective charge carriers, and the enlargement of catalytic surface area-all of which are limited by the intrinsic nature of single semiconductors. Additional critical factors required by practical applications include high chemical stability, high precision and flexibility of combinations of crystal structures and defects, optimum photocatalyst band positions, and low-cost.…”

“…[ 16,17 ] In general, low‐dimensional materials have shown appreciable differences in minimizing the recombination rate of electron–hole pairs as well as other electronic, catalytic, optical, and mechanical properties compared to their bulk counterparts. [ 18–24 ]…”

Synthesis and Selenization of Thickness-Controllable In2O3 Films by Printed Oxide Skin of Liquid Metals

“…In recent years, two-dimensional (2D) metal oxides have attracted great attention for their novel electronic and optoelectronic properties. − Most 2D metal oxides, represented by indium oxide (In 2 O 3 ), tin oxide, and gallium oxide, possess nonlayered structures and strong chemical bonds, which result in numerous surface dangling bonds with high-activity and high-energy surfaces. , Owing to their complex lattice structure and surface chemistry, the fabrication of atomically thin metal oxides on a substrate remains a big challenge …”