Title :
Type Conversion of Polycrystalline CdZnTe Thick Films by Multiple Compensation
Author :
Kim, K.H. ; Won, J.H. ; Cho, S.H. ; Suh, J.H. ; Hong, J.K. ; Kim, S.U.
Author_Institution :
Div. of Med. Sensor, Samil-Pharm, Seoul
fDate :
Oct. 29 2006-Nov. 1 2006
Abstract :
Semi-insulating n-type polycrystalline CdZnTe thick films are deposited by thermal evaporation method. The solubility of Cl in CdZnTe limits high doping concentration that establish full compensation. To make the most use of merit of Cl, heavy metals (Pb, Sn) are co-doped in CdZnTe. The electrical and optical properties of Pb and Sn co-doped with Cl are characterized by IV, PL and TOF measurement. Depends on the doping concentration of Pb or Sn, there was drastic changes in resistivity and conductivity type. In semi-insulating polycrystalline CdZnTe thick films, the A-center level that is found in compensated material, did not found. The electron mobility is about 88 cm2/Vs and for the first time the gamma ray spectrum of 241Am was detected using polycrystalline CdZnTe thick films.
Keywords :
II-VI semiconductors; cadmium compounds; electrical conductivity; electrical resistivity; electron mobility; gamma-ray spectra; semiconductor counters; semiconductor doping; thick films; A-center level; X-ray detector; conductivity type conversion; doping concentration; electrical properties; electrical resistivity; electron mobility; gamma ray spectrum; lead; multiple compensation; n-type semiconductors; optical properties; polycrystalline CdZnTe thick films; semiinsulating polycrystalline thick film; thermal evaporation method; tin; Conducting materials; Conductivity; Doping; Electric variables measurement; Electron mobility; Gamma ray detection; Optical films; Optical materials; Thick films; Tin; X-ray detector; lead; multiple compensation; polycrystalline CdZnTe; semi-insulating; thick films; tin; type conversion;
Conference_Titel :
Nuclear Science Symposium Conference Record, 2006. IEEE
Conference_Location :
San Diego, CA
Print_ISBN :
1-4244-0560-2
Electronic_ISBN :
1095-7863
DOI :
10.1109/NSSMIC.2006.353783