Platinum Schottky contacts on single-crystal ZnO with hydrogen peroxide treatment

Chia Hung Tsai, Shi Xiong Lin, Chen I. Hung, Chien Chih Liu, Mau Phon Houng

研究成果: Article

4 引文 斯高帕斯(Scopus)

摘要

Platinum (Pt) Schottky contacts (SCs) on hydrothermal grown Zn-terminated (0001) ZnO substrates with the different hydrogen peroxide (H2 O 2) treatment time are investigated. Under the treatment in room temperature, effective SCs are made for 45 min and longer time and the electrical characteristics show the dependence on treatment time. The irregular humps on ZnO surface with roughness measured by atomic force microscope differ as the treatment time and roughness exhibits the large variation between 0.368 and 3.566 nm, indicating the etching effect and near-surface defects related to the lattice imperfections. The evaluated barrier height has the value at 0.89-0.96 eV with the saturation current density in the range of 2.21× 10-10 -3.31× 10-9 A/ cm2. The effective donor concentration calculated from capacitance-voltage (C-V) measurement decreases as treatment time, implying the widening of the space charge region after H2 O2 treatment. The improved SC characteristics are attributed to the product of the wider bandgap and low-conductivity ZnO2 via grazing-incidence x-ray diffraction analysis. The rectifying behavior has the threshold dependence on the treatment time and has the reverse trend toward the surface asperities.

原文English
文章編號093702
期刊Journal of Applied Physics
106
發行號9
DOIs
出版狀態Published - 2009 十一月 30

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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