| Original Articles |
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A Novel Contactless Method for Characterization of Semiconductors: Surface Electron Beam Induced Voltage in Scanning Electron Microscopy
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| ZHU Shi-Qiu1;E. I. RAU2;YANG Fu-Hua1;ZHENG Hou-Zhi1 |
| 1National Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083
2Department of Physics, Moscow State University, Moscow 119899, Russia |
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| Cite this article: |
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ZHU Shi-Qiu, E. I. RAU, YANG Fu-Hua et al 2002 Chin. Phys. Lett. 19 1329-1332 |
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Abstract We present a novel contactless and nondestructive method called the surface electron beam induced voltage (SEBIV) method for characterizing semiconductor materials and devices. The SEBIV method is based on the detection of the surface potential induced by electron beams of scanning electron microscopy (SEM). The core part of the SEBIV detection setup is a circular metal detector placed above the sample surface. Capacitance between the circular detector and whole surface of the sample is estimated to be about 0.64 pf. It is large enough for the detection of the induced surface potential. The irradiation mode of electron beam (e-beam) influences the signal generation. When the e-beam irradiates on the surface of semiconductors continuously, a differential signal is obtained. The real distribution of surface potentials can be obtained when a pulsed e-beam with a fixed frequency is used for irradiation and a lock-in amplifier is employed for detection. The polarity of induced potential depends on the structure of potential barriers and surface states of samples. The contrast of SEBIV images in SEM changes with irradiation time and e-beam intensity.
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| Keywords:
72.20.Jv
73.25.+i
68.37.Hk
81.70.Ex
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Published: 01 September 2002
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| PACS: |
72.20.Jv
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(Charge carriers: generation, recombination, lifetime, and trapping)
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73.25.+i
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(Surface conductivity and carrier phenomena)
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68.37.Hk
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(Scanning electron microscopy (SEM) (including EBIC))
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81.70.Ex
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(Nondestructive testing: electromagnetic testing, eddy-current testing)
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