|
|
Signal analysis of transport and stochastic processes of emission detectors
Míšek, David ; Tofel, Pavel (referee) ; Andreev, Alexey (advisor)
This Diploma thesis deals with properties of CdTe detectors. This material is ranked among optical sensitive group. This thesis can be thematically divided into two basic parts. The first part describes properties of both elements and the chemical adduct. Selected properties show perfections of the material, which are specializing it to optical area of application. The end of this part contains description of contact metal-semiconductor. This problem is important to comprehension principle the material contact. In second part there were making many measurements. For more accurately compare were first measurements doing without light and then with light. During making measurement was changed wave length and temperature of sample. Key factors were Volt-Ampere characteristics and resistance result with changed temperature and wave length impact to the sample. For better accuracy measurements were done many times. All of data from measurement were cultivate by PC Easyplot programme.
|
|
|
Gamma- ray and X- ray detection by detectors based on (CdZn)Te single crystals.
Drobný, Miloslav ; Belas, Eduard (advisor) ; Grill, Roman (referee)
In this thesis, the influence of metal contacts, prepared on semiconductor detectors made of high resistive Cd0,85Zn0,15Te, on the quality of detected signal was investigated. The goal of thesis was to prepare ohmic contacts. Two materials (gold, platinum) and two methods of the preparation (chemical deposition, evaporation) were tested. It was found that improved detection properties were obtained on detectors prepared with gold contacts. Current-voltage characteristics of these contacts were found to be pseudoohmic. Moreover, when the Au contacts are prepared by evaporation, the value of the surface leakage current is lower.
|
|
|
Signal analysis of transport and stochastic processes of emission detectors
Míšek, David ; Tofel, Pavel (referee) ; Andreev, Alexey (advisor)
This Diploma thesis deals with properties of CdTe detectors. This material is ranked among optical sensitive group. This thesis can be thematically divided into two basic parts. The first part describes properties of both elements and the chemical adduct. Selected properties show perfections of the material, which are specializing it to optical area of application. The end of this part contains description of contact metal-semiconductor. This problem is important to comprehension principle the material contact. In second part there were making many measurements. For more accurately compare were first measurements doing without light and then with light. During making measurement was changed wave length and temperature of sample. Key factors were Volt-Ampere characteristics and resistance result with changed temperature and wave length impact to the sample. For better accuracy measurements were done many times. All of data from measurement were cultivate by PC Easyplot programme.
|
guest ::
