ZnO tetrapod Schottky photodiodes

被引:85
作者
Newton, Marcus C.
Firth, Steven
Warburton, Paul A.
机构
[1] UCL, Dept Elect & Elect Engn, London WC1E 7JE, England
[2] UCL, Dept Chem, London WC1H 0AJ, England
关键词
D O I
10.1063/1.2335949
中图分类号
O59 [应用物理学];
学科分类号
摘要
The fabrication of an ultraviolet photodiode employing a single ZnO tetrapod nanocrystal is reported. This diode structure is prepared by depositing W and Pt electrodes to form Ohmic and Schottky contacts, respectively. Dark current-voltage measurements show rectifying behavior. The properties of the metal-semiconductor interface are studied with above and below band gap illumination. It is found that with increasing UV excitation the device converts from a rectifying to an Ohmic behavior. This effect is attributed to a flattening of the energy bands due to the migration of photogenerated carriers within the space charge region at the metal-semiconductor interface. (c) 2006 American Institute of Physics.
引用
收藏
页数:3
相关论文
共 22 条
  • [1] [Anonymous], SEMICONDUCTOR SURFAC
  • [2] PHOTO-VOLTAIC PROPERTIES OF ZNO-CDTE HETEROJUNCTIONS PREPARED BY SPRAY PYROLYSIS
    ARANOVICH, JA
    GOLMAYO, D
    FAHRENBRUCH, AL
    BUBE, RH
    [J]. JOURNAL OF APPLIED PHYSICS, 1980, 51 (08) : 4260 - 4268
  • [3] Zinc oxide nanotetrapods
    Chen, Z
    Shan, ZW
    Cao, MS
    Lu, L
    Mao, SX
    [J]. NANOTECHNOLOGY, 2004, 15 (03) : 365 - 369
  • [4] Novel stabilization mechanism on polar surfaces: ZnO(0001)-Zn
    Dulub, O
    Diebold, U
    Kresse, G
    [J]. PHYSICAL REVIEW LETTERS, 2003, 90 (01) : 4 - 016102
  • [5] CONDITIONS FOR QUASI-EQUILIBRIUM IN A SEMICONDUDTOR SURFACE SPACE-CHARGE LAYER
    FRANKL, DR
    [J]. SURFACE SCIENCE, 1965, 3 (02) : 101 - &
  • [6] PHYSICAL THEORY OF SEMICONDUCTOR SURFACES
    GARRETT, CGB
    BRATTAIN, WH
    [J]. PHYSICAL REVIEW, 1955, 99 (02): : 376 - 387
  • [7] Pt/ZnO nanowire Schottky diodes
    Heo, YW
    Tien, LC
    Norton, DP
    Pearton, SJ
    Kang, BS
    Ren, F
    LaRoche, JR
    [J]. APPLIED PHYSICS LETTERS, 2004, 85 (15) : 3107 - 3109
  • [8] Effect of ozone cleaning on Pt/Au and W/Pt/Au Schottky contacts to n-type ZnO
    Ip, K
    Gila, BP
    Onstine, AH
    Lambers, ES
    Heo, YW
    Baik, KH
    Norton, DP
    Pearton, SJ
    Kim, S
    LaRoche, JR
    Ren, F
    [J]. APPLIED SURFACE SCIENCE, 2004, 236 (1-4) : 387 - 393
  • [9] Photocurrent in ZnO nanowires grown from Au electrodes
    Keem, K
    Kim, H
    Kim, GT
    Lee, JS
    Min, B
    Cho, K
    Sung, MY
    Kim, S
    [J]. APPLIED PHYSICS LETTERS, 2004, 84 (22) : 4376 - 4378
  • [10] Kim SH, 2005, APPL PHYS LETT, V86, DOI [10.1063/1.1862772, 10.1063/1.1839285]