Interfacial differences in enhanced schottky barrier height Au/n-GaAs diodes deposited at 77 K

详细信息    查看全文

• 作者：Andrew M. Herrero ; A.M. Gerger ; B.P. Gila ; S.J. Pearton ; Hung-Ta Wang ; S. Jang ; T. Anderson ; J.J. Chen ; B.S. Kang ; F. Ren ; et al.
• 关键词：GaAs ; Barrier height
• 刊名：Applied Surface Science
• 出版年：2007
• 出版时间：15 January 2007
• 年：2007
• 卷：253
• 期：6
• 页码：3298-3302
• 全文大小：706 K

文摘

The use of cryogenic temperatures (77 K) during Au Schottky contact deposition onto n-GaAs produces an increase in barrier height from 0.73 eV for room temperature diodes to 0.82 eV. Not all Schottky metals show this enhancement—for example Pt and Ti do not show any significant change in barrier height whereas Au, Pd and Ni show increases between 7 and 18 % . We used X-ray reflectivity to show that the main difference between Au deposited at 77 K and room temperature is a decreased metal roughness while the interfacial roughness between the Au and GaAs is basically the same. As the diodes are annealed to 300 °C both the difference in barrier height and interfacial roughness is lost. This is a simple method with potential for improving the performance of GaAs metal-semiconductor-field-effect-transistors (MESFETs).