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PROFESSOR
Fellow of American Physical Society


EDUCATION
B.S., National Taiwan University (1954)
M.S., Oklahoma State University (1957)
Ph.D., Columbia University (1962)

Studies of semiconductor layered structures, quantum dots, and photovoltaic materials using synchrotron radiation


FOCUS 

Semiconductors of reduced dimensionality (quantum wells, superlattices, arrays of quantum wires and quantum dots) exhibit many intriguing physical properties not found in bulk materials. These systems are of great interest for fundamental studies and for technological applications. X-rays from synchroton radiation can provide unique tools for probing the microscopic structure in these materials. A variety of X-ray techniques is applied to the study of semiconductor systems important for the development of electronic and photonic devices, as well as high-efficiency solar cells.

SELECTED PROJECTS

  • Study of impurities in quantum dots
  • Investigation of interface microstructure in semiconductor layered materials
  • Studies of heterojunction photovoltaic materials using synchrotron radiation

PUBLICATIONS

  • Y. L. Soo, S. W. Huang, Y. H. Kao, and A. D. Compaan. Annealing effects and Te mixing of CdTe/CdS heterojunctions. Appl. Phys. Lett. 74:218 (1999).
  • Y. L. Soo, S. W. Huang, Y. H. Kao, and A. D. Compaan. Investigation of interface morphology and composition mixing in CsTe/CdS heterojunction photovoltaic materials using synchrotron radiation. J. Appl. Phys. 83:4173 (1998).
  • Y. L. Soo, S. W. Huang, Z. H. Ming, Y. H. Kao, G. C. Smith, E. Goldhurst, R. Hodel, B. Kulkarni, J. V. D. Veliadis, and R. Bhargava. X-ray-excited luminescence and local structures in Tb-doped Y2O3 nanocrystals. J. Appl. Phys. 83:5404 (1998).
  • Y. H. Kao. Probing the microstructure in semiconductor layer materials using synchrotron radiation. Ch. J. Phys. 35:353 (1997).
  • Y. L. Soo, S. W. Huang, Z. H. Ming, Y. H. Kao, H. Munekata, and L. L. Chang. III-V diluted magnetic semiconductors: Substitutional doping of Mn in InAs. Phys. Rev. B 53:4905 (1996).

 

  

 

Fig. 1 Studies of doped quantum dots using X-ray-excited luminescence (XEL) technique developed in this laboratory.

(a) XEL results around the Tb L-edges in Y2O3: Tb quantum dots.

(b) XEL results around the Y K-edge.

 


 

Fig. 2 Studies of heterojunction photovoltaic materials using the angular dependence of X-ray fluorescence (ADXRF) technique developedin this laboratory.

  

a) Normalized X-ray fluorescence at various
angles from a CdTe/CdS heterojunction.

(b) Angular dependence of Te K X-ray fluorescence
for a glass/CdTe/CdS junction solar cell.

Last Updated: January 7, 2002
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