Controllable Thin‐Film Approaches for Doping and Alloying Transition Metal Dichalcogenides Monolayers. Issue 9 (26th February 2021)

• Record Type: Journal Article
• Authors: Lin, Yu‐Chuan; Torsi, Riccardo; Geohegan, David B.; Robinson, Joshua A.; Xiao, Kai
• Is Part Of: Advanced science. Volume 8:Issue 9(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-02-26
• Subjects: 2D materials -- alloy -- doping -- implantation -- laser -- thin‐film techniques -- transition metal dichalcogenides; Science -- Periodicals; 505
• DOI: 10.1002/advs.202004249
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Two‐dimensional (2D) transition metal dichalcogenides (TMDs) exhibit exciting properties and versatile material chemistry that are promising for device miniaturization, energy, quantum information science, and optoelectronics. Their outstanding structural stability permits the introduction of various foreign dopants that can modulate their optical and electronic properties and induce phase transitions, thereby adding new functionalities such as magnetism, ferroelectricity, and quantum states. To accelerate their technological readiness, it is essential to develop controllable synthesis and processing techniques to precisely engineer the compositions and phases of 2D TMDs. While most reviews emphasize properties and applications of doped TMDs, here, recent progress on thin‐film synthesis and processing techniques that show excellent controllability for substitutional doping of 2D TMDs are reported. These techniques are categorized into bottom–up methods that grow doped samples on substrates directly and top–down methods that use energetic sources to implant dopants into existing 2D crystals. The doped and alloyed variants from Group VI TMDs will be at the center of technical discussions, as they are expected to play essential roles in next‐generation optoelectronic applications. Theoretical backgrounds based on first principles calculations will precede the technical discussions to help the reader understand each element's likelihood of substitutional doping and the expected impact on the material properties. Abstract : Doping and alloying two‐dimensional (2D) materials offer tremendous opportunities for tuning their properties and adding new functionalities. In this review, recent progress on the non‐equilibrium thin‐film techniques that can provide scalable, large‐area synthesis and good degrees of controllability for the compositional engineering of 2D materials are summarized, especially focusing on semiconducting transition metal dichalcogenides including methods from bottom–up synthesis to top–down processing.