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Durham University

Institute of Medieval and Early Modern Studies (IMEMS)

Staff and Governance

Core Staff

The day-to-day running of IMEMS is the responsibility of the Core Executive Committee, comprising the Director and Associate Directors and the Administrator. 

Publication details for Prof Brian Tanner

Mullins, J. T., Dierre, F., Halliday, D. P., Tanner, B. K., Radley, I., Kang, Z. & Summers, C. J. (2017). Structural and optical properties of oxygen doped single crystal ZnTe grown by multi-tube physical vapour transport. Journal of Materials Science: Materials in Electronics 28(16): 11950-11960.

Author(s) from Durham

Abstract

Bulk single crystals of zinc telluride up to 10 mm thick have been grown by the Multi-Tube Physical Vapour Transport technique and doped, in-situ during growth, with oxygen. Following hetero-epitaxial nucleation and buffer growth on 100 mm diameter GaAs seed wafers, oxygen was introduced to the quartz growth envelope, using nitrous oxide as a precursor, via a novel gas injection system. Mass spectra from a residual gas analyser sampling the gases exiting the growth envelope indicated that the nitrous oxide had been cracked at the operating temperature of the furnace releasing oxygen into the growth region. The structural perfection of the grown crystals was assessed by synchrotron based X-ray diffraction measurements and found to be extremely high, improving significantly with distance from the seed. Rocking curve widths, measured over a 4 mm × 7 mm area, as low as 20 arcsec were observed. No evidence was found for a reduction in crystalline quality resulting from the incorporation of oxygen. Luminescence studies (4–300 K) showed strong red luminescence at 680 nm persisting up to room temperature indicating that oxygen had been incorporated substitutionally onto tellurium sites. This material is highly transparent at the red emission wavelength with absorption coefficients of approximately 2 cm−1. Under alpha radiation from a 241Am source, scintillation was observed from the doped material with approximately 12,700 photons/MeV and a full width at half height maximum of 27%. The material is a potential candidate for large volume scintillation based radiation detectors.


Full Executive Committee

Our Full Executive Committee is made up of the Core Executive Committee, listed above, plus a number of executive members including:


International Advisory Board

We are extremely fortunate to have be able to call on the help and guidance of colleagues from around the world who help to shape and guide our direction, strategy and international reach. Our current Advisory Board members are: