In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe
The performance of the CdTe radiation detectors heavily relies on the method of contact preparation. A convenient research method addressing this problem is the laser-induced transient current technique. In this paper, we compare the performance of two CdTe crystals which underwent different metalli...
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MDPI AG
2021-04-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/21/8/2783 |
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| author | Igor Vasylchenko Roman Grill Marián Betušiak Eduard Belas Petr Praus Pavel Moravec Pavel Höschl |
| author_facet | Igor Vasylchenko Roman Grill Marián Betušiak Eduard Belas Petr Praus Pavel Moravec Pavel Höschl |
| author_sort | Igor Vasylchenko |
| collection | DOAJ |
| description | The performance of the CdTe radiation detectors heavily relies on the method of contact preparation. A convenient research method addressing this problem is the laser-induced transient current technique. In this paper, we compare the performance of two CdTe crystals which underwent different metallization processes. We showed that appropriately designed Au/Al contacts induce much less bulk polarization than commercial Pt/In electrodes under the same working conditions and can thus provide a convenient alternative to the industry standard. The comparison was based on the monitoring of the time-dependent sensor polarization measuring transient currents excited by above-bandgap laser illumination complemented by the Am 241 gamma spectroscopy. The theoretical analysis of current waveforms and radiation spectra enabled us to determine the charge carrier mobility, mobility-lifetime products of electrons and holes, and temporal and bias dependence of the space charge formation. |
| first_indexed | 2024-03-10T12:17:57Z |
| format | Article |
| id | doaj.art-0956179d60094a65ba9e63f5b13906a5 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T12:17:57Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-0956179d60094a65ba9e63f5b13906a52023-11-21T15:39:34ZengMDPI AGSensors1424-82202021-04-01218278310.3390/s21082783In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTeIgor Vasylchenko0Roman Grill1Marián Betušiak2Eduard Belas3Petr Praus4Pavel Moravec5Pavel Höschl6Institute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, CZ-12116 Prague 2, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, CZ-12116 Prague 2, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, CZ-12116 Prague 2, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, CZ-12116 Prague 2, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, CZ-12116 Prague 2, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, CZ-12116 Prague 2, Czech RepublicInstitute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, CZ-12116 Prague 2, Czech RepublicThe performance of the CdTe radiation detectors heavily relies on the method of contact preparation. A convenient research method addressing this problem is the laser-induced transient current technique. In this paper, we compare the performance of two CdTe crystals which underwent different metallization processes. We showed that appropriately designed Au/Al contacts induce much less bulk polarization than commercial Pt/In electrodes under the same working conditions and can thus provide a convenient alternative to the industry standard. The comparison was based on the monitoring of the time-dependent sensor polarization measuring transient currents excited by above-bandgap laser illumination complemented by the Am 241 gamma spectroscopy. The theoretical analysis of current waveforms and radiation spectra enabled us to determine the charge carrier mobility, mobility-lifetime products of electrons and holes, and temporal and bias dependence of the space charge formation.https://www.mdpi.com/1424-8220/21/8/2783CdTetransient currentspace chargepolarization |
| spellingShingle | Igor Vasylchenko Roman Grill Marián Betušiak Eduard Belas Petr Praus Pavel Moravec Pavel Höschl In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe Sensors CdTe transient current space charge polarization |
| title | In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe |
| title_full | In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe |
| title_fullStr | In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe |
| title_full_unstemmed | In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe |
| title_short | In and Al Schottky Contacts Comparison on P-Type Chlorine-Doped CdTe |
| title_sort | in and al schottky contacts comparison on p type chlorine doped cdte |
| topic | CdTe transient current space charge polarization |
| url | https://www.mdpi.com/1424-8220/21/8/2783 |
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