Measurement of GaAs/(Al,Ga)As materials parameters for QWIP design calculations

Richard P. Leavitt; Daniel W. Beekman; John W. Little

doi:10.1117/12.354569

26 July 1999 Measurement of GaAs/(Al,Ga)As materials parameters for QWIP design calculations

Richard P. Leavitt, Daniel W. Beekman, John W. Little

Proceedings Volume 3698, Infrared Technology and Applications XXV; (1999) https://doi.org/10.1117/12.354569
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

We report the result of intersubband absorption measurement on a series of doped quantum-well samples and the determination of both the nonparabolicity parameters and the conduction band/valence band offset ratio of the GaAs/(AlGa)As material system. Absorption spectra were obtained in an FTIR spectrometer for samples with nominal quantum-well widths of 4.0, 4.5, 5.0, 7.5, 10.0, and 15.0 nm and for a series of miniband-transport quantum-well IR photodetectors. X-ray diffraction was used to determine quantum well and barrier thicknesses and the Al mole fraction x of the (Al,Ga)As barrier layers. Absorption measurements were made at temperatures of 295 K and 77 K. An empirical two-band model with an energy-dependent effective mass was used to calculate energy levels, transition energies, and spectral lineshapes for the quantum-well structures. Parameter values for nonparabolicity and band offset ratio were determined by comparison of calculated transition energies to measured spectral data.

Citation Download Citation

Richard P. Leavitt, Daniel W. Beekman, and John W. Little "Measurement of GaAs/(Al,Ga)As materials parameters for QWIP design calculations", Proc. SPIE 3698, Infrared Technology and Applications XXV, (26 July 1999); https://doi.org/10.1117/12.354569

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available