Personal profile

Research Interests

Our laboratory develops thin films and nanostructures for electronic, magnetic, and photonic materials applications, with emphasis on semiconductor and ferroic oxide thin films. We are now developing a new class of widegap compound semiconductors including perovskites for x-ray and gamma ray detection.  Semiconductor photodetectors are fabricated and their opto-electronic properties determined. The charge transport properties are determined by photoluminescence,  and photo-induced current transient spectroscopy measurements. Gamma ray detectors are fabricated and their response to hard radiation measured.

We have synthesized epitaxial oxides by metal-organic vapor phase epitaxy for applications in nanophotonics and nanomagnetics.  Emphasis is currently on the development of ferroelectric  oxide epitaxial thin films and photonic crystals. We measure their optical properties as well as their electro-optic properties. The ferroelectric domain structure is determined from electro-optical and microwave property measurements. Development of thin film photonic crystals for electro-optic modulators, and optical amplifiers for photonic integrated circuits (PICs) is under way.

Education / Academic qualification

Materials Science, PhD, Massachusetts Institute of Technology

… → 1973

Metallurgy and Materials Science, BS, University of Pennsylvania

… → 1968

Fingerprint Fingerprint is based on mining the text of the persons scientific documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

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thin films Physics & Astronomy
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electro-optics Physics & Astronomy
photoluminescence Physics & Astronomy
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Photoluminescence Chemical Compounds

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Research Output 1974 2018

Cu2I2Se6: A Metal-Inorganic Framework Wide-Bandgap Semiconductor for Photon Detection at Room Temperature

Lin, W., Stoumpos, C. C., Kontsevoi, O. Y., Liu, Z., He, Y., Das, S., Xu, Y., McCall, K. M., Wessels, B. W. & Kanatzidis, M. G. Feb 7 2018 In : Journal of the American Chemical Society. 140, 5, p. 1894-1899 6 p.

Research output: Contribution to journalArticle

Semiconductors
Photons
Energy gap
Metals
X-Rays
1 Citations

Role of Stoichiometry in the Growth of Large Pb2P2Se6 Crystals for Nuclear Radiation Detection

Xu, Y., Fu, X., Zheng, H., He, Y., Lin, W., McCall, K. M., Liu, Z., Das, S., Wessels, B. W. & Kanatzidis, M. G. Feb 21 2018 In : ACS Photonics. 5, 2, p. 566-573 8 p.

Research output: Contribution to journalArticle

nuclear radiation
Stoichiometry
stoichiometry
Gamma Rays
X-Rays
3 Citations

Cascaded spintronic logic with low-dimensional carbon

Friedman, J. S., Girdhar, A., Gelfand, R. M., Memik, G., Mohseni, H., Taflove, A., Wessels, B. W., Leburton, J. P. & Sahakian, A. V. Jun 5 2017 In : Nature Communications. 8, 15635

Research output: Contribution to journalArticle

Magnetoelectronics
Carbon Nanotubes
logic
Graphite
graphene
5 Citations

Charge Transport and Observation of Persistent Photoconductivity in Tl6SeI4 Single Crystals

Das, S., Peters, J. A., Lin, W., Kostina, S. S., Chen, P., Kim, J. I., Kanatzidis, M. G. & Wessels, B. W. Apr 6 2017 In : Journal of Physical Chemistry Letters. 8, 7, p. 1538-1544 7 p.

Research output: Contribution to journalArticle

Photoconductivity
Charge transfer
Single crystals
Quenching
Energy gap
5 Citations

Defect Antiperovskite Compounds Hg3Q2I2 (Q = S, Se, and Te) for Room-Temperature Hard Radiation Detection

He, Y., Kontsevoi, O. Y., Stoumpos, C. C., Trimarchi, G. G., Islam, S. M., Liu, Z., Kostina, S. S., Das, S., Kim, J. I., Lin, W., Wessels, B. W. & Kanatzidis, M. G. Jun 14 2017 In : Journal of the American Chemical Society. 139, 23, p. 7939-7951 13 p.

Research output: Contribution to journalArticle

Radiation
Defects
Temperature
Vacancies
Gamma Rays