Journal
JOURNAL OF APPLIED PHYSICS
Volume 130, Issue 17, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0063365
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) [EP/L015390/1]
- University College London [PR16195]
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Metal oxides are being studied as an alternative to metal contacts on thallium bromide (TlBr) radiation detectors, forming a type-II staggered heterojunction between TlBr and metal oxides upon contact. The valence band offsets (VBO) and conduction band offsets for SnO2/TlBr and ITO/TlBr heterojunctions have been determined using the Kraut method. The I-V response of symmetric In/SnO2/TlBr and In/ITO/TlBr planar devices is nearly Ohmic with low leakage current.
Metal oxides are investigated as an alternative to metal contacts on thallium bromide (TlBr) radiation detectors. X-ray photoelectron spectroscopy studies of SnO2/TlBr and ITO/TlBr devices indicate that a type-II staggered heterojunction forms between TlBr and metal oxides upon contacting. By using the Kraut method of valence band offset (VBO) determination, the VBOs of SnO2/TlBr and ITO/TlBr heterojunctions are determined to be 1.05 & PLUSMN; 0.17 and 0.70 & PLUSMN; 0.17 eV, respectively. The corresponding conduction band offsets are then found to be 0.13 & PLUSMN; 0.17 and 0.45 & PLUSMN; 0.17 eV, respectively. The I-V response of symmetric In/SnO2/TlBr and In/ITO/TlBr planar devices is almost Ohmic with a leakage current of less than 2.5 nA at 100 V.
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