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Relaxation dynamics of photoionized carriers in n-type and p-type germanium

Deßmann, Nils and Pavlov, Sergey and Pohl, Andreas and Wienold, Martin and Tsyplenkov, V.V. and Shastin, V.N. and Zhukavin, R.Kh. and Shengurov, D.V. and Winnerl, S. and Abrosimov, Nickolay and Hübers, Heinz-Wilhelm (2016) Relaxation dynamics of photoionized carriers in n-type and p-type germanium. TELBE Kick-Off Meeting, 4.-5. Feb. 2016, Dresden, Deutschland.

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Abstract

Intense and short pulsed THz sources require fast, broad-band detectors with large dynamic range. Extrinsic germanium photodetectors made from moderately compensated (32%) crystals have response times of a few ns. The low temperature capture of free charge carriers into ionized, hydrogen-like antimony and gallium centers in germanium has been studied by a dedicated, degenerate pump-probe experiment (λPump= λProbe) using the free-electron laser (FEL) FELBE at the Helmholtz-Zentrum Dresden-Rossendorf. The analysis of the pump-probe signal reveals typical capture times (τc) in the order of a few nanoseconds, which decrease with increasing (pump) photon flux density (ΦPump) on the probed surface spot on the sample. The results support an acoustic-phonon assisted cascade capture model. Additionally, we have determined the capture time in high doped and up to almost 100% compensated n-Ge:Sb:Ga and p-Ge:Ga:Sb. The capture time varies between 20 and 350 ps. With such material a sub-ns broadband THz-detector could be realized.

Item URL in elib:https://elib.dlr.de/107693/
Document Type:Conference or Workshop Item (Poster)
Title:Relaxation dynamics of photoionized carriers in n-type and p-type germanium
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Deßmann, NilsNils.Dessmann (at) dlr.deUNSPECIFIED
Pavlov, SergeySergeij.Pavlov (at) dlr.deUNSPECIFIED
Pohl, Andreasa.pohl (at) dlr.deUNSPECIFIED
Wienold, MartinMartin.Wienold (at) dlr.deUNSPECIFIED
Tsyplenkov, V.V.institute for physics of microstructures, russain academy of sciencesUNSPECIFIED
Shastin, V.N.institute for physics of microstructures, russian academy of sciences, nizhny novgorod, russiaUNSPECIFIED
Zhukavin, R.Kh.institute for physics of microstructures, russian academy of sciences, nizhny novgorod, russiaUNSPECIFIED
Shengurov, D.V.institute for physics of microstructures, russain academy of sciencesUNSPECIFIED
Winnerl, S.s.winnerl (at) hzdr.deUNSPECIFIED
Abrosimov, Nickolayleibniz-institut für kristallzüchtung (ikz), berlinUNSPECIFIED
Hübers, Heinz-WilhelmHeinz-Wilhelm.Huebers (at) dlr.deUNSPECIFIED
Date:4 February 2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:THz. Germanium, Free electron laser, time-resolved experiment, short pulses
Event Title:TELBE Kick-Off Meeting
Event Location:Dresden, Deutschland
Event Type:Workshop
Event Dates:4.-5. Feb. 2016
Organizer:Helmholtz-Zentrum Dresden-Rossendorf
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben OptoRob
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Deßmann, Nils
Deposited On:11 Nov 2016 11:49
Last Modified:07 Aug 2017 12:30

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