Dr. Bernard A. Weinstein

Photo of Professor B. A. Weinstein  

Professor, Ph.D. Brown (1974)

Office: 209 Fronczak Hall,  (716) 645-6730
Lab: 217A Fronczak Hall,  (716) 645-2904
Email: phyberni@buffalo.edu
link to personal website for more info

Education

  Ph.D. -- Brown University (1974)
B.S. -- University of Rochester (1968)

Research Interests

 
  • Effects of pressure/strain on phonon and electron states in semiconductor and oxide systems
  • Vibron modes and anharmonic interactions in nanocrystals under pressure
  • Photo-induced crystallization in amorphous Se and chalcogenide glasses
  • Deep defects and localization in crystalline and disordered semiconductors
Experimental research is carried out on the high-pressure and optical properties of intrinsic and defect states in semiconductors and their nanostructures. This includes studies of: vibrational properties -- especially phonon-phonon and electron-phonon interactions; localized electronic states in defective crystals and disordered systems; photostructural changes and metastable bonding; and high-pressure phase transitions. Students conduct Raman scattering, luminescence, and other visible/IR spectroscopies to probe these phenomena in bulk semiconductors and wide-gap oxides, III-V and II-VI heterostructures in layer or nanoparticle form, III-V-N alloys and chalcogen glasses. Diamond-anvil pressure cells applying ~0.1-0.5Mbar at room - and cryogenic-temperatures are used in many studies.

Selected Publications

  1. Pressure Dependence of Raman Active Vibrations in InP-CdS Hybrid Nanoparticles, R. Tallman, B.A. Weinstein, C. Trallero-Giner, Y. Sahoo, P. Prasad, Physica Status Sol.(b), 246 No.3, 477-481(2009).
  2. Similarities in kinetics of photocrystallization and photodarkening in a-Se, R. E. Tallman, A. Reznik, B. Weinstein, S. D. Baranovskii, J. A. Rowlands, Applied Physics Letters, 93 212103(1-3) (2008).
  3. Photocrystallization in a-Se imaging targets: Raman studies of competing effects, R. Tallman, B. A. Weinstein, A. Reznik, M. Kubota, K. Tanioka, J. Rowlands, J. of Non-Crystal. Solids 354, 4577 (2008)
  4. Exciton Emission in alpha-PTCDA Thin Films under Uniaxial Pressure, V. Gangilenka, A. DeSilva, H. Wagner, R.E. Tallman, B. A. Weinstein, Phys. Rev. B 77, 1152006(1-8) (2008).
  5. Raman Spectroscopy under Pressure in Semiconductor Nanoparticles, B. A. Weinstein, Physica Status Solidi (b) 244, 368-379 (2007), invited review.
  6. Effect of Crystal Structure and Dopant Concentration on the Luminescence of Cr3+ in Al2O3 Nanocrystals, A. Patra, R. E. Tallman, and B. A. Weinstein, Optical Materials 27, 1396-1401 (2005).
  7. Raman scattering in beta-ZnS, J. Serrano, A. Cantarero, M. Cardona, N. Garro, R. Lauck, R. E. Tallman, T. M. Ritter, and B. A. Weinstein, Physical Review B 69, 014301(1-12) (2004).
  8. Evidence for selective delocalization of N-pair states in dilute GaAs1-xNx B. A. Weinstein, S. R. Stambach, T. M. Ritter, J. O. Maclean and D. J. Wallis, Phys. Rev. B 68, 035336 (2003).