Quantum-coupled borophene-based heterolayers for excitonic and molecular sensing applications

Vishwakarma, Kavita; Rani, Shivani; Chahal, Sumit; Lu, Chia-Yen; Ray, Soumya Jyoti; Yang, C. C.; Kumar, Prashant

doi:10.1039/d2cp01712a

Cited by 21 publications

(11 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As we discussed in the above sections that NPC was widely observed in various types of materials. ,,,,− Different origin has been proposed for NPC generation, which can be suitable for various kind of applications. The NPC effect has been used for the fabrication of humidity and light sensors, highly sensitive photodetectors, and nonvolatile memories. ,− Qin et al demonstrated that the NPC in nanodiamonds can be applied for humidity sensors with the sensitivity of 1.26 × 10 6 %, which is the highest in carbon-based humidity sensors . Zhuang et al showed the application of NPC in humidity sensors with a responsivity of 418.1 μAW –1 (at high humid RH = 90%) .…”

mentioning

confidence: 99%

Negative Photoconductivity: Bizarre Physics in Semiconductors

Tailor

Aranda

Saliba

et al. 2022

ACS Materials Lett.

View full text Add to dashboard Cite

Many gadgets in our daily life work on the photodetection principle. These photodetectors (such as silicon (Si), gallium arsenide (GaAs), and indium gallium arsenide (InGaAs)) work on the principle of positive photoconductivity (PPC), where conductivity increases with light illumination. However, an opposite phenomenon, where the conductivity decreases with light exposure, also known as negative photoconductivity (NPC), has been reported in various inorganic (doped-Si, PbTe, 2D materials), organic (graphene, carbon nanotubes), and organic–inorganic hybrid (halide perovskites) materials. The origin of NPC phenomena in a semiconductor is still debated though its application potential has recently reached far beyond photodetection. Here, we have critically analyzed the fundamental photophysics of NPC phenomena in semiconductors, discussed its mechanistic origin in detail, and demonstrated how it depends on various external factors, such as temperature, illumination intensity, humidity, doping concentration, etc. We also highlight the recent progress of NPC in ultrasensitive detection applications. Finally, we discussed the existing challenges and provided a roadmap about how NPC can be helpful in next-generation semiconductor optoelectronics.

show abstract

mentioning

confidence: 99%

Negative Photoconductivity: Bizarre Physics in Semiconductors

Tailor

Aranda

Saliba

et al. 2022

ACS Materials Lett.

View full text Add to dashboard Cite

show abstract

“…In fact, room temperature electrical signal is very noisy. Therefore, room-temperature diagnosis tools such as scanning tunneling microscopy (STM) or current force microscopy (CAFM) based electrical signals for evaluating the quality of interfaces are being developed [ 253 ].…”

Section: Primary Challengesmentioning

confidence: 99%

2D materials: increscent quantum flatland with immense potential for applications

et al. 2022

Self Cite

View full text Add to dashboard Cite

Quantum flatland i.e., the family of two dimensional (2D) quantum materials has become increscent and has already encompassed elemental atomic sheets (Xenes), 2D transition metal dichalcogenides (TMDCs), 2D metal nitrides/carbides/carbonitrides (MXenes), 2D metal oxides, 2D metal phosphides, 2D metal halides, 2D mixed oxides, etc. and still new members are being explored. Owing to the occurrence of various structural phases of each 2D material and each exhibiting a unique electronic structure; bestows distinct physical and chemical properties. In the early years, world record electronic mobility and fractional quantum Hall effect of graphene attracted attention. Thanks to excellent electronic mobility, and extreme sensitivity of their electronic structures towards the adjacent environment, 2D materials have been employed as various ultrafast precision sensors such as gas/fire/light/strain sensors and in trace-level molecular detectors and disease diagnosis. 2D materials, their doped versions, and their hetero layers and hybrids have been successfully employed in electronic/photonic/optoelectronic/spintronic and straintronic chips. In recent times, quantum behavior such as the existence of a superconducting phase in moiré hetero layers, the feasibility of hyperbolic photonic metamaterials, mechanical metamaterials with negative Poisson ratio, and potential usage in second/third harmonic generation and electromagnetic shields, etc. have raised the expectations further. High surface area, excellent young’s moduli, and anchoring/coupling capability bolster hopes for their usage as nanofillers in polymers, glass, and soft metals. Even though lab-scale demonstrations have been showcased, large-scale applications such as solar cells, LEDs, flat panel displays, hybrid energy storage, catalysis (including water splitting and CO2 reduction), etc. will catch up. While new members of the flatland family will be invented, new methods of large-scale synthesis of defect-free crystals will be explored and novel applications will emerge, it is expected. Achieving a high level of in-plane doping in 2D materials without adding defects is a challenge to work on. Development of understanding of inter-layer coupling and its effects on electron injection/excited state electron transfer at the 2D-2D interfaces will lead to future generation heterolayer devices and sensors.

show abstract

“…Graphene − and its inorganic analogues Xenes such as borophene, − phosphorene, stanene, and germanene, 2D-gold, transition metal dichalcogenides (TMDCs), metal oxides (2DMOs), and MXenes (metal nitrides, carbides, and carbonitrides) due to their fascinating behavior have revolutionized materials science and technology where the corresponding bulk or nanomaterials do not compete with their 2D forms. − They have successfully been employed in excitonics, in molecular sensing, as oxidation-resistant laminates, as a laser shield, and in manipulation of single-photon emission. − Even though straining and hybridization have already been implemented to manipulate material properties, substitutional doping is the apt strategy to change the material intrinsically and irreversibly. − Bandgap engineering in 2D materials is essential to meet the needs of electronic, optoelectronic, spintronic, and straintronic chips, as they are mechanically flexible at a few monolayer thicknesses. , While graphene gets oxidized, molybdenum disulfide (MoS 2 ) gets structurally degraded at elevated temperatures. Therefore, for high-temperature applications of these flexible, functional chips, one needs to explore 2D materials that can withstand high temperatures, keeping structural and chemical phase qualities intact.…”

Section: Introductionmentioning

confidence: 99%

Transition Metal-Doped Boron Nitride Atomic Sheets with an Engineered Bandgap and Magnetization

et al. 2022

Self Cite

View full text Add to dashboard Cite

Controlled doping of flat atomic sheets of boron nitride (BN) can in principle break charge and spin symmetries. In contrast to graphene that oxidizes at >500 °C, due to its high melting point (ca. 2700 K) and the electrically insulating nature (E g ∼ 5.5 eV), BN presents strong material candidature for flexible magnetic memory chips that are functional even under fire. Here, we report the transition metal (Fe and Cr) doping of BN by microwave and solvothermal methods. X-ray photoelectron spectroscopy reveals ∼17% doping by microwave (800 W) and <11% doping by the solvothermal method. Cr or Fe doping brings the bandgap down to ∼3.6 or ∼2.0 eV, respectively, for the doped BN samples. Cr doping by microwave results in intrinsic ferromagnetic ordering evident from the high Curie point (∼380 K) in contrast to orbital-mediated magnetic ordering in solvothermal Cr-doped BN systems. Fe doping raises magnetization values in particular. Spin-polarized DFT band structure calculations suggest vivid spin asymmetry caused by doping, supporting our experimental findings on doped BN samples.

show abstract

Quantum-coupled borophene-based heterolayers for excitonic and molecular sensing applications

Abstract: Borophene (B), possessing remarkably unique chemical binding in its crystallographic structural phases including anisotropic structures, theoretically has high Young’s modulus as well as thermal conductivity and moreover, it is metallic...

Cited by 21 publications

References 48 publications

Negative Photoconductivity: Bizarre Physics in Semiconductors

Negative Photoconductivity: Bizarre Physics in Semiconductors

2D materials: increscent quantum flatland with immense potential for applications

Transition Metal-Doped Boron Nitride Atomic Sheets with an Engineered Bandgap and Magnetization

Contact Info

Product

Resources

About