Study of surface passivation and contact deposition techniques in CdZnTe X-Ray and gamma-ray detectors

Dominique E Jones,S U Egarievwe,A Hossain,Ifechukwude O Okwechime,Mebougna Drabo, Jaqueeta Hall,Aaron L Adams,S Babalola,G S Camarda,A E Bolotnikov,Wing Chan,R B James

Nuclear Science Symposium and Medical Imaging Conference（2012）

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摘要

Passivation and improved contact deposition techniques are known to reduce the surface leakage current and decrease noise levels of CdZnTe X-Ray and gamrna-ray detectors by improving their spectral energy resolutions. This paper presents a comparative study of surface passivation process in CdZnTe X-Ray and gamma-ray detectors. The experimental study compares three surface passivation processes: mechanically polished with a O.9μm Alumina Powder (AI2O3) finishing; mechanically polished with a O.9μm Alumina Powder (AI2O3) and etched with HBr + H2O2 solution for 2 minutes; mechanically polished with a O.9,.m Alumina Powder (AI2O3) and chemomechanically polished with bromine-methanol-ethylene glycol solution. The results show that chemo-mechanical polishing with bromine-methanol-ethylene glycol solution proved to be the best method out of the three for reducing surface leakage current. The preliminary results of aging studies on H2O2 (Hydrogen Peroxide), NH4F (Ammonium Fluoride) + H2O2 + H2O and (NH4hS (Ammonium Sulfide) passivation agents are also presented.

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关键词

x-ray detection,alumina,cadmium compounds,chemical mechanical polishing,gamma-ray detection,leakage currents,passivation,semiconductor counters,zinc compounds,al2o3,alumina powder finishing,cdznte,x-ray detector,bromine-methanol-ethylene glycol solution,chemomechanical polishing,contact deposition techniques,gamma-ray detector,noise level,spectral energy resolution,surface leakage current,surface passivation,time 2 min

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