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GaAs/AlX Ga1-X As KUANTUM KUYULU YAPILARDA DİKEY TRANSPORT ESNASINDA BARİYER YÜKSEKLİĞİNİN BELİRLENMESİ

THE DETERMINATION OF BARRIER HEIGHT DURING VERTICAL TRANSPORT IN GaAs/AlX Ga1-X As QUANTUM WELL STRUCTURES

Journal Name:

  • Sigma Mühendislik ve Fen Bilimleri Dergisi

Publication Year:

  • 2008

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this work, how the changing of barrier height in GaAs/Alx Ga1-x As quantum well structures during vertical transport according to applied voltage, sample diameter and number of wells has been experimentally determined. The samples investigated here have 0, 2, 4, 7 and 10 quantum wells. To investigate the effect of sample diameter on barrier height, we used the samples with diameters of 100, 200, 400 and 800 µm. A voltage, parallel to growth direction, varies between 10 mV and 600 mV is applied. The barrier height values are being different which is determined from the current- temperature curves can be explained by the existence of space charges. The increasing the applied constant voltages reduce the barrier height and occurring a small difference on barrier height for the different diameter and increasing the number of well reduce the effect of the space charge has been determined.
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Abstract (Original Language): 
Bu çalışmada, GaAs/AlX Ga1-X As kuantum kuyulu yapılarda dikey transport esnasında, yapıdaki engel yüksekliğinin, uygulanan voltaja, örnek çapına ve kuyu sayısına bağlı olarak nasıl değiştiği deneysel olarak belirlendi. Çalışmada, 0, 2, 4, 7 ve 10 kuantum kuyusuna sahip yapılar incelendi. Örnek çapının etkisine bakılmak için 100, 200, 400, 600 ve 800 µm çapındaki örnekler kullanıldı. Voltaj, yapıların büyütülme doğrultusunda, 10 mV ile 600 mV arasında uygulandı. Akım-sıcaklık eğrilerinden belirlenen engel yüksekliği değerlerinin farklı oluşu, engel bölgesindeki uzay yükünün varlığı ile açıklandı. Uygulanan sabit voltajın değerinin arttırılması ile engel yüksekliğinin azaldığı, çaptaki farklılığın engel yüksekliğinde küçük farklılıklara sebep olduğu ve kuyu sayısındaki artış ile uzay yükünün etkisinin azaldığı tespit edildi.
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  • 3
206-215
  • Turkish

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