Table of Contents
Members of the 2D group VA semiconductors (phosphorene, arsenene, antimonene, and bismuthine) are gaining significant research interest due to their unique properties and potential applications. These materials, with their layered morphology, tunable direct bandgap, high charge carrier mobility, high stability, unique in-plane anisotropy, and negative Poisson’s ratio, offer exciting opportunities in the fields of electronics, optoelectronics, and batteries. In this comprehensive review, we analyze the most recent analytical and empirical developments in the fundamental characteristics, fabrication techniques, and potential implementation of 2D group VA materials. We also present insights and concerns for the future of this field.
Introduction
2D materials have attracted substantial interest in various sectors, including electronics and optoelectronic devices, due to their unique physiochemical characteristics such as large aspect ratios, quantum size effects, and mechanical flexibility [^1]. Among the 2D materials, members of the 2D group VA materials, including phosphorene (P), arsenene (As), antimonene (Sb), and bismuthene (Bi), are particularly appealing for applications in nanoelectronic devices that aim to reduce energy consumption [^2]. The advantages of group VA semiconductors include their tunable direct bandgap (0.3 to 2.62 eV) and high charge carrier mobility compared to other materials like transition metal dichalcogenides (TMDs) and semimetallic group IVA materials [^3]. These monoelemental semiconductor allotropes exhibit original and unique properties, making them highly attractive for various applications [^4].
Phosphorene, in particular, has been extensively studied and is known for its large tunable direct bandgap, from 0.3 eV in the bulk to 2.0 eV in monolayers [^5]. Its high charge carrier mobility (up to 10,000 cm−2 V−1 s−1) and good in-plane anisotropy further contribute to its suitability for semiconductor devices [^2][^7]. Arsenene and antimonene, the cousins of phosphorene, have also attracted attention due to their fascinating structures and interesting electronic properties. These materials expand the scope of applications in diverse fields and have fascinated the scientific community in recent years [^4][^6]. Bismuthene, with its strong spin-orbit coupling, quantum size effects, low carrier density, and long mean free path, offers unique properties that make it a versatile material [^6].
To synthesize 2D group VA layered materials, various approaches have been used, including mechanical exfoliation, vapor deposition techniques, liquid-phase exfoliation, molecular beam epitaxy, and plasma-assisted methods [^9]. These different fabrication techniques offer advantages for different research goals. Additionally, extensive density functional theory (DFT) simulations have been used to predict the diverse bandgaps of group VA elements, making them attractive for broad-spectrum photoresponse [^1].
In this review, we aim to provide a comprehensive analysis of the recent developments in the fundamental characteristics, fabrication techniques, and potential applications of 2D group VA materials. We will explore various functional nanostructures that can be created using these materials and discuss their unique properties and potential applications in electronics, optoelectronics, and batteries. Finally, we will address the future prospects and challenges for the field of 2D group VA materials.
Functional Nanostructures
2D group VA materials can be further modified to create a wide range of functional nanostructures for various applications. Hybrid heterostructures, atom molecule doping, and surface functionalization are all possible approaches to modify these materials and enhance their properties. By creating hybrid materials with other nanostructures, synergistic effects can be achieved, leading to enhanced physicochemical characteristics.
Surface modification is an effective method for enhancing the effectiveness of 2D group VA materials. Various functionalization methods, such as electrostatic functionalization, van der Waals functionalization, and covalent functionalization, can be used to modify the surfaces of these materials before practical applications. Lewis acids, such as alkali ions, transition metal ions, and organic molecules, can interact with the surfaces of 2D materials, leading to improved stability and enhanced long-term properties.
To modify the surfaces of 2D group VA materials, physical and chemical methods can be employed, including ball milling, thermal evaporation, assembling, vacuum deposition, solvent evaporation, impregnation, spin coating, self-assembly, photoreduction, chemical reaction, focused laser-induced oxidation, phase conversion, and more. These methods have been widely used to develop various optical, optoelectronic, and electronic devices, including Li-ion batteries, Na-ion batteries, junction FETs, memory devices, photodetectors, and more.
Future Prospect
While phosphorene has been extensively studied, more research is needed to address its Achilles’ heel, which is its quick oxidation tendency and light-induced breakdown in the presence of damp conditions. Future research should focus on reducing oxidation and improving long-term resilience under atmospheric conditions to accelerate the realization of phosphorene-based devices.
For arsenene, recent experimental studies have provided evidence for the successful fabrication of few-layered arsenene for electrochemical applications. This opens the door for further experimental studies on arsenene’s unique characteristics. Antimonene has also shown promise, with experiments confirming its environmental stability. The potential applications of antimonene in fields such as catalysis and biomedical engineering are expected to expand in the near future.
Bismuthene offers a range of unique properties, including strong spin-orbit coupling, quantum size effects, low carrier density, and long mean free path. The bandgap of bismuthene can be controlled by the number of layers, and its electrical state differs from that of its bulk 3D crystal. Bismuthene can be used in a wide range of electronic applications, including spintronic devices, computation and data communications, quantum spin Hall insulating materials, and saturable absorbers. Future research should focus on the development of insulators engineered with bismuthene.
The allotropic forms of 2D group VA materials, including phosphorene, arsenene, antimonene, and bismuthene, offer intriguing possibilities for diverse applications. The synthesis of these allotropic forms is critical for exploring their unique properties and potential applications. Future research should focus on the synthesis of these allotropic forms on a large scale using affordable and environmentally friendly methods.
Additionally, the exploration of functional nanostructures, including hybrids, heterostructures, and functionalized nanostructures, is crucial for expanding the range of applications for 2D group VA materials. These functional nanostructures can exhibit enhanced physicochemical characteristics and offer new opportunities for advanced nanodevices and intelligent systems.
In conclusion, 2D group VA materials, including phosphorene, arsenene, antimonene, and bismuthene, present exciting possibilities for various applications in electronics, optoelectronics, and batteries. These materials offer unique properties, such as tunable bandgaps, high charge carrier mobility, and in-plane anisotropic structures. While challenges remain in terms of large-scale synthesis and device stability, the future prospects for the field of 2D group VA materials are promising. Further research and development efforts are needed to fully explore the potential of these materials and bring them to practical applications.
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