Exceptional transport property in a rolled-up germanium tube

Guo, Qinglei; Wang, Gang; Chen, Da; Li, Gongjin; Huang, Gaoshan; Zhang, Miao; Wang, Xi; Mei, Yongfeng; Di, Zengfeng

doi:10.1063/1.4978692

Cited by 12 publications

(14 citation statements)

References 35 publications

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“…According to the bending theory [54] and considering the rolling-up process of GeSn/Ge bilayer [16], the outer and inner surfaces of the microcavities are in tension and compression, respectively. Additionally, the theoretical strain distributions along the radial direction can be approximated as linear dependence [15]. In this way, the strain values of rolled-up GeSn/Ge microcavities are calculated and highlighted by the red line in figure 3(f), which are comparable with the values obtained from micro-Raman spectroscopy.…”

Section: Resultssupporting

confidence: 59%

“…It should be noted that the penetration depth of a laser into a certain type of material depends on its wavelength [51]. As schematically illustrated in figure 3(b), the penetration depth of 514 nm laser in Ge is 17.74 nm, while for 325 nm laser the penetration depth is 8.70 nm [15]. Thus, only surface signal can be collected for the 325 nm laser, while signal detected for the 514 nm laser represents an average value in much greater depth.…”

Section: Resultsmentioning

confidence: 99%

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Infrared tubular microcavity based on rolled-up GeSn/Ge nanomembranes

Tian

Cong

et al. 2018

Nanotechnology

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Germanium-Tin (GeSn) alloys have attracted great amounts of attention as these group IV semiconductors present direct band-gap behavior with high Sn content and are compatible with current complementary metal oxide semiconductor technology. In this work, three dimensional tubular GeSn/Ge micro-resonators with a diameter of around 7.3 μm were demonstrated by rolling up GeSn nanomembranes (NM) grown on a Ge-on-insulator wafer via molecular beam epitaxy. The microstructural properties of the resonators were carefully investigated and the strain distributions of the rolled-up GeSn/Ge microcavities along the radial direction were studied by utilizing micro-Raman spectroscopy with different excitation laser wavelengths. The values of the strains calculated from Raman shifts agree well with the theoretical prediction. Coupled with fiber tapers, as-fabricated devices present a high quality factor of up to 800 in the transmission spectral measurements. The micro-resonators fabricated via rolled-up nanotechnology and GeSn/Ge NMs in this work may have great potential in photonic micro- and nanodevices.

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Section: Resultssupporting

confidence: 59%

Section: Resultsmentioning

confidence: 99%

Infrared tubular microcavity based on rolled-up GeSn/Ge nanomembranes

Tian

Cong

et al. 2018

Nanotechnology

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“…Rolled‐up inorganic nanomembrane–based 3D architectures, such as nanoscrolls and nanosprings, have great potential in applications of supercapacitors, optical microcavity, actuators, resistive random access memory, motors, etc., because of their distinct properties arising from 3D geometry. In this work, a 3D tubular photodetector is proposed to increase the photoresponsivity of 2D materials benefiting from the significantly enhanced light absorption.…”

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confidence: 99%

Rolling up MoSe₂ Nanomembranes as a Sensitive Tubular Photodetector

Zhou

Tian

Kim

et al. 2019

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which is located in the near-infrared and visible region. [9] Bandgaps in TMDCs are tunable by applying external electric field or mechanical strain. Combined with broad-band optical absorption and mechanical flexibility, TMDCs are one of appealing materials for the application in optoelectronic devices such as field effect transistors, photodetectors, and light-emitting diodes. Photodetectors based on molybdenum disulfide (MoS 2 ), [1,3] tungsten disulfide (WS 2 ), [10,11] molybdenum diselenide (MoSe 2 ), [7,8] and their heterojunctions [12] were constructed and exhibited photoresponsivity ranging from a few mA W −1 to several hundred A W −1 , which is related to the materials selected, layer numbers, and device contacts. Intrinsically, the photoresponsivity is restricted by their absorption cross section and present lower values because of small thickness of TMDCs. [9] Integration of TMDC materials into photonic structures such as photonic crystals and microcavities offers a solution to enhance the photoresponsivity. [13][14][15] For example, Fano-resonant photonic crystals could significantly boost light absorption in monolayer MoS 2 and the absorption can reach up to 90% at the resonant wavelength. [13] Another typical approach to enhancing photoresponsivity is to hybridize TMDCs with plasmonic structures. A MoS 2 photodetector hybridized with Ag nanowire network was demonstrated and presented greatly enhanced photocurrent over the pristine MoS 2 photodetectors because of surface plasmon coupling. [5] However, the photoresponsivity can be only enhanced at designed and selected wavelength in these hybrid photodetectors mentioned above. It is promising that 3D mesostructures could enhance light absorption over wide range due to its circular geometry and thus improve photoelectric performance. [16][17][18][19] Rolled-up inorganic nanomembrane-based 3D architectures, [20][21][22] such as nanoscrolls and nanosprings, have great potential in applications of supercapacitors, [23] optical microcavity, [24][25][26] actuators, [27,28] resistive random access memory, [29] motors, [30] etc., because of their distinct properties arising from 3D geometry. In this work, a 3D tubular photodetector is proposed to increase the photoresponsivity of 2D materials benefiting from the significantly enhanced light absorption. We introduce this tubular microstructure into the MoSe 2based photodetector for improved detection performance. 3D photodetector based on rolled-up MoSe 2 nanomembrane was Transition metal dichalcogenides, as a kind of 2D material, are suitable for near-infrared to visible photodetection owing to the bandgaps ranging from 1.0 to 2.0 eV. However, limited light absorption restricts photoresponsivity due to the ultrathin thickness of 2D materials. 3D tubular structures offer a solution to solve the problem because of the light trapping effect which can enhance optical absorption. In this work, thanks to mechanical flexibility of 2D materials, self-rolled-up technology is applied to build up a 3D tubular structure ...

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“…Compared with the bulk counterpart, XOI system exhibits less parasitic capacitance and lower power consumption, which makes it an excellent platform for high‐performance electronic devices . The compound nanomembranes can be semiconductors such as silicon and germanium, or insulators such as nanocrystalline diamond and vanadium dioxide (VO 2 ) . Other materials could be further deposited on the topmost nanomembranes to achieve more properties.…”

Section: Release Methodsmentioning

confidence: 99%

Rolled‐up Nanotechnology: Materials Issue and Geometry Capability

Huang

et al. 2018

Adv Materials Technologies

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chemical vapor deposition (CVD). When it comes to on-chip integrations, these strategies are limited by accessible materials and slow processing rate, [31] and the generated defects in the produced amorphous materials placed restrictions to its further applications in high-performance devices. [32] Therefore, novel approaches and methods of fabricating 3D micro/ nanostructures are highly demanded.Rolled-up nanotechnology is an alternative technique that fabricates 3D nanostructures out of planar films called nanomembranes. Nanomembranes are defined as planar thin films with thicknesses between one to a few hundred nanometers. [33] These nanomembrane materials behave like soft materials while maintaining excellent properties like their bulk counterpart and therefore is an ideal platform for fabricating 3D nanostructures. Inspired by concepts of origami and kirigami, [34][35][36][37] researchers folded and rolled these nanomembranes into a number of fascinating 3D structures. [17,[38][39][40][41][42][43][44] Several review articles have been published with emphasis on nanomembranes thinning and manufacture, mechanical deformation, fundamental studies, and their practical applications. [33,41,[45][46][47] By releasing strain-engineered planar functional nanomembranes on sacrificial layers, complex rolled-up structures including tubes, [48][49][50][51][52][53][54] rings, [54][55][56] and helices [42,[57][58][59] can be constructed (for instance, see Figure 1f). This approach can be applied to engineer a wide range of organic and inorganic materials and their combinations, including metals, insulators, traditional semiconductor families, and recently emerged 2D materials. Given its compatibility to standard CMOS fabrication process and ability to manufacture large periodic arrays with precise geometric control, rolled-up nanotechnology further expands the applications of 3D nanostructures to a number of areas, including optical resonators, [60,61] photodetectors, [62,63] micromotors, [64][65][66] energy storage, [67] drug delivery, [68] gas detection, [53] and environmental decontamination. [69] The versatility in the materials design and geometric tuning in rolled-up nanotechnology presents tremendous opportunities for further developing sophisticated 3D fine structures.In this review, we focus on the materials perspective and fabrication process of rolled-up nanotechnology. First, we give a brief introduction of rolled-up mechanism, as well as its fabrication techniques and control strategies. We summarize and highlight recent advances of different materials systems and their corresponding rolling methodologies. Second, Rolled-up nanotechnology is an appealing technique that tunes planar films into complex 3D fine structures. The rolling-up mechanism and methodology of a huge variety of materials and their combinations are summarized, including metals, insulators, traditional semiconductor families, polymers, and recently emerged 2D materials. The basic principles of strain induction, fabrication methods, and techni...

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Exceptional transport property in a rolled-up germanium tube

Cited by 12 publications

References 35 publications

Infrared tubular microcavity based on rolled-up GeSn/Ge nanomembranes

Infrared tubular microcavity based on rolled-up GeSn/Ge nanomembranes

Rolling up MoSe₂ Nanomembranes as a Sensitive Tubular Photodetector

Rolled‐up Nanotechnology: Materials Issue and Geometry Capability

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Exceptional transport property in a rolled-up germanium tube

Cited by 12 publications

References 35 publications

Infrared tubular microcavity based on rolled-up GeSn/Ge nanomembranes

Infrared tubular microcavity based on rolled-up GeSn/Ge nanomembranes

Rolling up MoSe2 Nanomembranes as a Sensitive Tubular Photodetector

Rolled‐up Nanotechnology: Materials Issue and Geometry Capability

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Rolling up MoSe₂ Nanomembranes as a Sensitive Tubular Photodetector