A self-powered ultraviolet detector based on a single ZnO microwire/p-Si film with double heterojunctions.

Recently, self-powered devices based on a p-n heterojunction have been widely reported, but there are few reports about self-powered UV detectors based on a single ZnO microwire/p-Si film with double heterojunctions. Compared with the common p-n heterojunction type devices, the fabricated devices with double heterojunctions based on a single n-type ZnO microwire and a p-type Si film exhibited excellent electrical performance such as an ideal rectification behaviour and a low turn-on voltage. At zero bias, the fabricated device can deliver a photocurrent of 71 nA, a high photosensitivity of about 3.17 × 10(3) under UV light (0.58 mW cm(-2)) illumination and a fast rising and falling time of both less than 0.3 s. Furthermore, the photocurrent increased with the rising of the optical intensity at low power intensities. The physical mechanism has been explained by energy band diagrams.

[1]  Qingliang Liao,et al.  Scanning Probe Study on the Piezotronic Effect in ZnO Nanomaterials and Nanodevices , 2012, Advanced materials.

[2]  Zhong Lin Wang,et al.  Large-Scale Hexagonal-Patterned Growth of Aligned ZnO Nanorods for Nano-optoelectronics and Nanosensor Arrays. , 2004, Nano letters.

[3]  U. Chung,et al.  Fabrication and device characterization of omega-shaped-gate ZnO nanowire field-effect transistors. , 2006, Nano letters.

[4]  Woong Kim,et al.  ZnO nanowire field‐effect transistor as a UV photodetector; optimization for maximum sensitivity , 2009 .

[5]  J. Myoung,et al.  Junction properties of Au/ZnO single nanowire Schottky diode , 2010 .

[6]  W. Marsden.  I and J , 2012 .

[7]  Yue Zhang,et al.  ZnO nanowire array ultraviolet photodetectors with self-powered properties , 2013 .

[8]  Zhong Lin Wang,et al.  Spontaneous Polarization-Induced Nanohelixes, Nanosprings, and Nanorings of Piezoelectric Nanobelts , 2003 .

[9]  K. S. Stevens,et al.  Photoconductive ultraviolet sensor using Mg‐doped GaN on Si(111) , 1995 .

[10]  Yue Zhang,et al.  Self-powered ultraviolet photodetector based on a single Sb-doped ZnO nanobelt , 2010 .

[11]  Zhong Lin Wang,et al.  Enhancing light emission of ZnO microwire-based diodes by piezo-phototronic effect. , 2011, Nano letters.

[12]  W. Park,et al.  Electroluminescence in n‐ZnO Nanorod Arrays Vertically Grown on p‐GaN , 2004 .

[13]  Giorgio Sberveglieri,et al.  Stable and highly sensitive gas sensors based on semiconducting oxide nanobelts , 2002 .

[14]  L. Dai,et al.  Self-powered high performance photodetectors based on CdSe nanobelt/graphene Schottky junctions , 2012 .

[15]  Eicke R. Weber,et al.  Catalytic Growth of Zinc Oxide Nanowires by Vapor Transport , 2001 .

[16]  C. Soci,et al.  ZnO nanowire UV photodetectors with high internal gain. , 2007, Nano letters.

[17]  Zhong Lin Wang,et al.  Self-powered nanowire devices. , 2010, Nature nanotechnology.

[18]  Zhong Lin Wang,et al.  Direct-Current Nanogenerator Driven by Ultrasonic Waves , 2007, Science.

[19]  Zhong-Lin Wang.  Towards Self‐Powered Nanosystems: From Nanogenerators to Nanopiezotronics , 2008 .

[20]  M. A. Mahdi,et al.  High sensitivity and fast response and recovery times in a ZnO nanorod array/p-Si self-powered ultraviolet detector , 2012 .

[21]  Qingliang Liao,et al.  A self-powered strain senor based on a ZnO/PEDOT:PSS hybrid structure , 2013 .

[22]  Nuanyang Cui,et al.  High‐Performance Integrated ZnO Nanowire UV Sensors on Rigid and Flexible Substrates , 2011 .

[23]  L. Dai,et al.  Self‐Powered, Ultrafast, Visible‐Blind UV Detection and Optical Logical Operation based on ZnO/GaN Nanoscale p‐n Junctions , 2011, Advanced materials.

[24]  M. Meyyappan,et al.  Single Crystal Nanowire Vertical Surround-Gate Field-Effect Transistor , 2004 .

[25]  N. Cheung,et al.  Extraction of Schottky diode parameters from forward current-voltage characteristics , 1986 .

[26]  Zhiyong Fan,et al.  Three-dimensional nanopillar-array photovoltaics on low-cost and flexible substrates. , 2009, Nature materials.

[27]  Jinhui Song,et al.  Nanowire Piezoelectric Nanogenerators on Plastic Substrates as Flexible Power Sources for Nanodevices , 2007 .

[28]  Effect of asymmetric Schottky barrier on GaN-based metal-semiconductor-metal ultraviolet detector , 2011 .

[29]  Yue Zhang,et al.  Transport Property Tuned by Gate Irradiation in ZnO Nanotetrapod Devices , 2012 .

[30]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[31]  Yue Zhang,et al.  Size effect in a cantilevered ZnO micro/nanowire and its potential as a performance tunable force sensor , 2013 .