Browsing by Author "Ergün, Yüksel"
Now showing items 21-32 of 32
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N structure for type-II superlattice photodetectors
Salihoğlu, Ömer; Muti, Abdullah; Kutluer, Kutlu; Tansel, Tunay; Turan, Raşit; Ergün, Yüksel; Aydınlı, Atilla (Amer Inst Physics, 2012)In the quest to raise the operating temperature and improve the detectivity of type II superlattice (T2SL) photodetectors, we introduce a design approach that we call the "N structure." N structure aims to improve absorption ... -
N-structure based on InAs/AlSb/GaSb superlattice photodetectors
Hoştut, M.; Alyörük, M.; Tansel, Tunay; Kılıç, A.; Turan, Raşit; Aydınlı, A.; Ergün, Yüksel (Academic Press LTD- Elsevier Science LTD, 2015)We have studied the theoretical and experimental properties of InAs/AlSb/GaSb based type-II superlattice (T2SL) pin photodetector called N-structure. Electronic properties of the superlattice such as HH-LH splitting energies ... -
A new approach to quantum well infrared photodetectors: Staircase-like quantum well and barriers
Eker, Süleyman Umut; Hoştut, Mustafa; Ergün, Yüksel; Sökmen, İsmail (Elsevier Science BV, 2006)We present a theoretical investigation of a novel staircase-like quantum well infrared photodetector (QWIP). The proposed structure makes use of quantum wells and barriers with increasing Al content both in the wells and ... -
Orta kızılötesi bölgede (3-5 ?m) InAs/GaSb süperörgü p-i-n ışık algılayıcı yapıların elektromanyetik alan tepkisi
Korkmaz, Güven (Anadolu Üniversitesi, 2010)Bu tezde bir ince film topluluguna gönderilen TE ve TM modundaki elektromanyetik dalgaların, matris yöntemiyle yansıtıcılıgı ve geçirgenligi incelenmiştir. Burada yapılan hesaplamalarda ince film olarak bir ışık algılayıcı ... -
Patara Hurmalık Hamamı antik yapı malzemelerinin mikroanaliz teknikleri ve spektroskopik yöntemlerle karakterizasyonu
Arıkan, Bülent (Anadolu Üniversitesi, 2009)Arkeolojik buluntuların ve eski yapılarda kullanılan yapı malzemelerinin laboratuar analizleri, geçmiş dönemlerde yaşamış toplumların sahip oldukları malzeme bilgisini ve teknolojisini anlamak, mevcut yapılara zarar veren ... -
A study of photomodulated reflectance on staircase-like, n-doped GaAs/Al (x) Ga1-x As quantum well structures
Dönmez, Ömer; Nutku, Ferhat; Erol, Ayşe; Arıkan, Çetin M.; Ergün, Yüksel (Springer, 2012)In this study, photomodulated reflectance (PR) technique was employed on two different quantum well infrared photodetector (QWIP) structures, which consist of n-doped GaAs quantum wells (QWs) between undoped Al (x) Ga1-x ... -
Three-color broadband asymmetric quantum well infrared photodetectors in long wavelength infrared range (LWIR)
Hoştut, Mustafa; Alyörük, M.; Ergün, Yüksel; Sökmen, İsmail (Springer, 2010)A theoretical investigation of a GaAs/AlGaAs-material-system-based four quantum well infrared detector structures consisting of ten periods of three asymmetric quantum well units are presented. Each quantum well in the ... -
Tunable long-wavelength broad band asymmetric quantum well infrared photodetector
Hoştut, Mustafa; Kartal, D.; Ergün, Yüksel; Sökmen, İsmail (IOP Publishing LTD, 2007)We present a theoretical investigation of a GaAs/AlGaAs infrared detector consisting of three asymmetric quantum wells. Each well is designed to yield absorption and a photoresponse at peak wavelengths of 8.2 mu m, 9.5 mu ... -
The variation of electronic properties with the doping concentration of modulation-doped AlxGa1-xAs-GaAs double quantum wells
Ungan, Fatih; Öztürk, Emine; Ergün, Yüksel; Sökmen, İsmail (Academic Press LTD Elsevier Science LTD, 2007)In this paper we have calculated the sub-band structure and the confinement potential of modulation-doped Ga1-xAlxAs-GaAs double quantum wells as a function of the doping concentration. The electronic properties of this ... -
Variational Computations for Excitons in Quantum Dots: a Quantum Monte Carlo Study
Yıldız, A.; Şakiroğlu, S.; Doğan, U.; Akgüngor, K.; Epik, H.; Sökmen, I.; Ergün, Yüksel (World Scientific Publ Co Pte LTD, 2011)A study of variational wave functions for calculation of the ground-state energies of excitons confined in a two-dimensional (2D) disc-like and three-dimensional (3D) spherical parabolic GaAs quantum dots (QDs) is presented. ... -
Voltage Tunable Dual-Band Quantum-Well Infrared Photodetector for Third-Generation Thermal Imaging
Hoştut, M.; Kılıç, Abidin; Şakiroğlu, S.; Ergün, Yüksel; Sökmen, I. (IEEE-Inst Electrical Electronics Engineers Inc, 2011)We investigate the theoretical calculations of the voltage tunable dual-band quantum-well infrared photodetector (QWIP) in the long and very long wavelength infrared range (LWIR and VLWIR). The detector consists of two ... -
Zero-bias offsets in I-V characteristics of the staircase type quantum well infrared photodetectors
Nutku, Ferhat; Erol, Ayşe; Arıkan, M. Çetin; Ergün, Yüksel (Elsevier Science BV, 2014)In this work, observed zero-bias offsets in I-V characteristics and differences in J-V characteristics of staircase quantum well infrared photodetectors were investigated. Temperature and voltage sweep rate dependence of ...