Potential and Carrier Distribution in AlGaN Superlattice

• Authors: K. Korona , K. Pakuła , R. Bożek , A. Drabińska , K. Surowiecka , R. Stępniewski , E. Zielińska-Rohozińska , J. Baranowski
• Languages of publication: EN

Abstracts

EN

Photocurrent spectroscopy and Kelvin force microscopy have been used in order to determine charge, field, and potential distributions in spontaneously grown superlattice. The spectra show that light can generate currents and potentials in both directions depending on photon energy. A numerical model made for superlattice of periodλ_{SL} = 33 nm shows that electric field in superlattice oscillates coherently with Al content. The oscillations of electric field explain the different directions of photocurrent. The electric field can also separate electrons and holes, making carrier lifetimes longer and lowering excitation intensity threshold for occupation inversion.

Keywords

EN

72.40.+w; 73.61.Ey; 73.21.Cd

Discipline

• 73.61.Ey: III-V semiconductors
• 73.21.Cd: Superlattices
• 72.40.+w: Photoconduction and photovoltaic effects

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2005
• Volume: 108
• Issue: 4
• Pages: 723-729

Dates

published

2005-10

received

2005-06-04

Contributors

author

K. Korona

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

K. Pakuła

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

R. Bożek

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

A. Drabińska

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

K. Surowiecka

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

R. Stępniewski

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

E. Zielińska-Rohozińska

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

J. Baranowski

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

References

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• 8. K.P. Korona, A. Drabińska, A. Trajnerowicz, R. Bozek, K. Pakula, J.M. Baranowski, Acta Phys. Pol. A, 103, 675, 2003

Identifiers

DOI

10.12693/APhysPolA.108.723