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Author: joseph kopanski

Displaying records 41 to 50 of 107 records.
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41. Determination of surface barrier height and surface state density in GaN films grown on sapphire substrates
Published: 3/24/2005
Authors: Seong-Eun Park, Joseph J Kopanski, Youn-Seon Kang, Lawrence H Robins, Hyun-Keel Shin
Abstract: Photoreflectance (PR) modulation spectroscopy was performed to investigate surface properties of GaN films grown on sapphire substrates. From the period of the Franz-Keldysh oscillations, the surface electric field across the GaN space charge region ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31874

42. Surface photovoltage spectroscopy of minority carrier diffusion lengths in undoped and Si-doped GaN epitaxial films
Published: 3/24/2005
Authors: Seong-Eun Park, Joseph J Kopanski, Youn-Seon Kang, Lawrence H Robins
Abstract: Undoped and Si-doped GaN epitaxial films have been grown on sapphire substrates by metal-organic chemical vapor deposition. Variable angle spectroscopic ellipsometry (VASE) and surface photovoltage (SPV) spectroscopy were used to determine the minori ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31729

43. Experimental investigation of interface states and photovoltaic effects on the scanning capacitance microscopy measurement for p-n junction dopant profiling
Published: 12/20/2004
Authors: Jihui Yang, Joseph J Kopanski, A Postula, M Bialkowski
Abstract: A special scanning capacitance microscopy (SCM) sample preparation method is exploited to make unipolar and p-n junction samples with different interface state densities and an identical oxide thickness. Using these samples, the interface states effe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31743

44. Experimental investigation of the dielectric-semiconductor interface with scanning capacitance microscopy
Published: 12/20/2004
Authors: Jihui Yang, Joseph J Kopanski, A Postula, M Bialkowski
Abstract: An experimental investigation of how interface states effect scanning capacitance microscopy (SCM) measurements is presented. Different sample polishing procedures were used to make SCM samples that would have different interface state densities, but ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31737

45. Semiconductor Dopant Profiling and Dielectric Characterization with Scanning Capacitance Microscopy
Published: 11/30/2004
Author: Joseph J Kopanski
Abstract: Scanning capacitance microscopy (SCM) has been commonly used to image dopant gradients in silicon and other semiconductors. As a mobile, high-resolution (to 10 nm) metal-oxide-semiconductor (MOS) probe, SCM also is a non-destructive, contactless tool ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31861

46. Influence of Interface Traps and Surface Mobility Degradation on Scanning Capacitance Microscopy Measurement
Published: 9/1/2004
Authors: Y. D. Hong, Tong Yeow Yeow, W. K. Chim, K. M. Wong, Joseph J Kopanski
Abstract: Scanning Capacitance Microscopy (SCM) is based on metal-oxide-semiconductor (MOS) theory. However, instead of the standard 100 kHz to 1 MHz signal used in conventional MOS capacitance-voltage measurement, SCM uses signal at 915 MHz. At this high freq ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31417

47. Quantitative Interpretation of Scanning Capcitance Microscope Images as Two-Dimensional Dopant Profiles
Published: 3/10/2004
Authors: Joseph J Kopanski, Jay F. Marchiando
Abstract: Scanning capacitance microscopy (SCM) is used as a qualitative analysis tool with multiple applications for failure analysis. SCM can measure the shape of dopant profiles, can ascertain if certain implants have been completed, can verify the conducti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31471

48. On calculating scanning capacitance microscopy data for a dopant profile in semiconductors
Published: 2/1/2004
Authors: Jay F. Marchiando, Joseph J Kopanski
Abstract: While the calculating the dopant profile from SCM data (the inverse problem) can be formulated as a regularized nonlinear least-squares optimization problem, wherein Poisson equations are solved within the quasi-static approximation in each iteration ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31368

49. PSPICE Analysis of a Scanning Capacitance Microscope Sensor
Published: 2/1/2004
Authors: Gyoung Ho Buh, Chi Tran, Joseph J Kopanski
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31655

50. Towards reproducible SCM Image Interpretation
Published: 2/1/2004
Authors: Joseph J Kopanski, Jay F. Marchiando, Brian G. Rennex, David S Simons, R P Chaudhury
Abstract: SCM images, and the two-dimensional (2-D) dopant profiles extracted from them, show poor reproducibility from laboratory to laboratory. Major factors contributing to SCM image variability include: poor sample surface and oxide quality, excess carrier ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=31404



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