Doping Process of 2D Materials Based on the Selective Migration of Dopants to the Interface of Liquid Metals

Abstract

The introduction of trace impurities within the doping processes of semiconductors is still a technological challenge for the electronics industries. By taking advantage of the selective enrichment of liquid metal interfaces, and harvesting the doped metal oxide semiconductor layers, the complexity of the process can be mitigated and a high degree of control over the outcomes can be achieved. Here, a mechanism of natural filtering for the preparation of doped 2D semiconducting sheets based on the different migration tendencies of metallic elements in the bulk competing for enriching the interfaces is proposed. As a model, liquid metal alloys with different weight ratios of Sn and Bi in the bulk are employed for harvesting Bi2O3‐doped SnO nanosheets. In this model, Sn shows a much stronger tendency than Bi to occupy surface sites of the Bi–Sn alloys, even at the very high concentrations of Bi in the bulk. This provides the opportunity for creating SnO 2D sheets with tightly controlled Bi2O3 dopants. By way of example, it is demonstrated how such nanosheets could be made selective to both reducing and oxidizing environmental gases. The process demonstrated here offers significant opportunities for future synthesis and fabrication processes in the electronics industries.

Polydopamine Shell as a Ga3+ Reservoir for Triggering Gallium–Indium Phase Separation in Eutectic Gallium–Indium Nanoalloys

“…Tunable nanostructures with accessible surfaces can serve as gas-sensing materials, whose performance is greatly influenced by their interfacial properties. ,, In this work, in order to assess the proof-of-concept gas-sensing properties of the synthesized nanoalloy@PDAs, these materials were exposed to NO 2 gas at room temperature and their interactions were studied. These gas sensors were fabricated by drop-casting the synthesized nanoalloy@PDAs onto an interdigitated transducer made of a silver–palladium (Ag–Pd) electrode printed on alumina substrates.…”

2D Ultrawide Bandgap Semiconductors: Odyssey and Challenges

“…[ 58,59 ] Then, the study quickly expand to other chalcogenide and has further inspired attention on other compounds, such as metal oxyhalides, metal nitrides, metal oxides, and Dion–Jacobson perovskite oxides. [ 28,33–35,60–74 ] Atomically thin 2D UWBG semiconductor materials have sky‐rocketing developed into a unique subdiscipline in the last decade, offering new possibilities for designing and fabricating (opto)electronic devices with novel functionalities at the nanoscale ( Figure ). Up to date, studies on 2D UWBG semiconductors have covered the crystal structures, synthesis methods, properties, and device applications.…”

“…[58,59] Then, the study quickly expand to other chalcogenide and has further inspired attention on other compounds, such as metal oxyhalides, metal nitrides, metal oxides, and Dion-Jacobson perovskite oxides. [28,[33][34][35][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74] Atomically thin 2D UWBG semiconductor materials have sky-rocketing developed into a unique subdiscipline in the last decade, offering new possibilities for designing and fabricating (opto)electronic devices with novel functionalities at the nanoscale (Figure 1). Up to date, studies on 2D 2D ultrawide bandgap (UWBG) semiconductors have aroused increasing interest in the field of high-power transparent electronic devices, deep-ultraviolet photodetectors, flexible electronic skins, and energy-efficient displays, owing to their intriguing physical properties.…”

Liquid Metal Based Nano-Composites for Printable Stretchable Electronics

“…However, due to the inconvenient process, it is difficult for selective printing technology to be generalized in large-scale production. Recently, from a material standpoint, the multi-scale (from micro to nano) combination [ 20 ] of other materials with LM (e.g., the composites of metals [ 21 ], magnetic materials [ 22 ], elastomers [ 23 ], and 2D materials [ 22 , 24 ]) has become a popular approach to further enrich and improve its functions, as shown in Figure 1 . Enhanced by compositing, these liquid metal-based nano-composites exhibit sufficient capabilities to meet the requirements of printable stretchable electronics.…”