Two‐Dimensional Van Der Waals Thin Film and Device

Abstract

In the rapidly evolving field of thin‐film electronics, the emergence of large‐area flexible and wearable devices has been a significant milestone. Although organic semiconductor thin films, which can be manufactured through solution processing, have been identified, their utility is often undermined by their poor stability and low carrier mobility under ambient conditions. However, inorganic nanomaterials can be solution‐processed and demonstrate outstanding intrinsic properties and structural stability. In particular, a series of two‐dimensional (2D) nanosheet/nanoparticle materials have been shown to form stable colloids in their respective solvents. However, the integration of these 2D nanomaterials into continuous large‐area thin with precise control of layer thickness and lattice orientation still remains a significant challenge. This review paper undertakes a detailed analysis of van der Waals thin films, derived from 2D materials, in the advancement of thin‐film electronics and optoelectronic devices. The superior intrinsic properties and structural stability of inorganic nanomaterials are highlighted, which can be solution‐processed and underscor the importance of solution‐based processing, establishing it as a cornerstone strategy for scalable electronic and optoelectronic applications. A comprehensive exploration of the challenges and opportunities associated with the utilization of 2D materials for the next generation of thin‐film electronics and optoelectronic devices is presented.

Advancements in transition metal dichalcogenides (TMDCs) for self-powered photodetectors: challenges, properties, and functionalization strategies

“…For a variety of optoelectronic applications, the remarkable optical properties of MoS 2 , WS 2 , and MoSe 2 have sparked a lot of interest. 98 Because of their unique optical characteristics, these materials are interesting choices for a variety of optoelectronic applications, including solar cells, photodetectors, LEDs, and more. Because of strong absorption coefficients of MoS 2 in the visible and near-infrared parts of the spectrum, it is a great option for solar cells and photodetectors.…”

Solution-Processable and Printable Two-Dimensional Transition Metal Dichalcogenide Inks

“…By contrast, 2D TMD nanosheets are free of dangling bonds since the crystal surface is fully saturated with their intrinsic layered crystal structure. In the assembled thin film, 2D nanosheet crystals form a nonbonding vdW interface between each other, which is atomically clean and free of chemical disorders that typically plague the films based on 0D and 1D nanostructures. ,, Therefore, the charge transport across the grain boundaries is expected to be greatly improved, which would boost the overall electrical performance of the assembled thin film. Furthermore, the 2D TMD nanosheet crystals have been demonstrated to possess excellent mechanical flexibility that can be bent to a large extent without breaking the crystal lattice or losing the intrinsic electronic performance. , For all these merits, the solution-processable 2D TMD ink materials and thin films are promising for the large-area and cost-effective fabrication of high-performance flexible electronic devices.…”

“…In the assembled thin film, 2D nanosheet crystals form a nonbonding vdW interface between each other, which is atomically clean and free of chemical disorders that typically plague the films based on 0D and 1D nanostructures. 30,48,49 Therefore, the charge transport across the grain boundaries is expected to be greatly improved, which would boost the overall electrical performance of the assembled thin film. Furthermore, the 2D TMD nanosheet crystals have been demonstrated to possess excellent mechanical flexibility that can be bent to a large extent without breaking the crystal lattice or losing the intrinsic electronic performance.…”

Visible-Light Self-Powered Photodetector with High Sensitivity Based on the Type-II Heterostructure of CdPSe3/MoS2

“…In the past two decades, layered van der Waals (vdW) materials have demonstrated great potential in a wide range of applications for next-generation optoelectronic, spintronic, and energy devices. − Due to their unique structures, mechanical flexibility, and excellent physical properties, such materials typically possess strong in-plane covalent bonds and weak interlayer vdW interactions, making them easily exfoliate into thin layers and freely stack together to form so-called vdW heterostructures. − Compared with traditional heterojunctions, the interfaces of vdW heterojunctions are dangling bond-free, which will greatly inhibit the recombination of photogenerated electron–hole pairs. So far, a variety of vdW materials and related heterostructures have been employed in optoelectronic devices, and their emerging properties have been attracting increasing attention. − …”