Ultrathin Single‐Crystalline Boron Nanosheets for Enhanced Electro‐Optical Performances

Large‐scale single‐crystalline ultrathin boron nanosheets (UBNSs, ≈10 nm) are fabricated through an effective vapor–solid process via thermal decomposition of diborane. The UBNSs have obvious advantages over thicker boron nanomaterials in many aspects. Specifically, the UBNSs demonstrate excellent f...

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Bibliographic Details
Published in:Advanced science 2015-06, Vol.2 (6), p.1500023-n/a
Main Authors: Xu, Junqi, Chang, Yangyang, Gan, Lin, Ma, Ying, Zhai, Tianyou
Format: Article
Language:English
Subjects:
Boron
Chemical vapor deposition
field emission
field‐effect transistors
Graphene
Lasers
Nanomaterials
photoelectricity
Science
Semiconductors
Silicon wafers
Spectrum analysis
Transmission electron microscopy
ultrathin nanosheets
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Summary:Large‐scale single‐crystalline ultrathin boron nanosheets (UBNSs, ≈10 nm) are fabricated through an effective vapor–solid process via thermal decomposition of diborane. The UBNSs have obvious advantages over thicker boron nanomaterials in many aspects. Specifically, the UBNSs demonstrate excellent field emission performances with a low turn‐on field, E to, of 3.60 V μm−1 and a good stability. Further, the dependence of (turn‐on field) E to/(threshold field) E thr and effective work function, Φ e, on temperature is investigated and the possible mechanism of temperature‐dependent field emission phenomenon has been discussed. Moreover, electronic transport in a single UBNS reveals it to be an intrinsic p‐type semiconductor behavior with carrier mobility about 1.26 × 10−1 cm2 V−1 s−1, which is the best data in reported works. Interestingly, a multiconductive mechanism coexisting phenomenon has been explored based on the study of temperature‐dependent conductivity behavior of the UBNSs. Besides, the photodetector device fabricated from single‐crystalline UBNS demonstrates good sensitivity, reliable stability, and fast response, obviously superior to other reported boron nanomaterials. Such superior electronic‐optical performances are originated from the high quality of single crystal and large specific surface area of the UBNSs, suggesting the potential applications of the UBNSs in field‐emitters, interconnects, integrated circuits, and optoelectronic devices. Large‐scale high‐quality single‐crystalline ultrathin boronnanosheets are fabricated through an effective vapor–solid process via thermal decomposition of diborane. The field‐emission, electronic transport, and photoconductive properties are then investigated. The strong combination of low turn‐on field, high current density, good stability, favorable electron transport characteristics, high sensitivity and fast response time reveals potential applications in field‐emitters, interconnects, integrated circuits, and optoelectronic devices.
ISSN:2198-3844
2198-3844
DOI:10.1002/advs.201500023