Degradation studies of InGaN/GaN heterostructure laser diodes using a Kelvin Force Microscope

André Lochthofen; Wolfgang Mertin; Gerd Bacher; Michael Furitsch; Georg Brüderl; Berthold Hahn; Uwe Strauss; Volker Härle

doi:10.1117/12.704855

8 February 2007 Degradation studies of InGaN/GaN heterostructure laser diodes using a Kelvin Force Microscope

André Lochthofen, Wolfgang Mertin, Gerd Bacher, Michael Furitsch, Georg Brüderl, Berthold Hahn, Uwe Strauss, Volker Härle

Author Affiliations +

Proceedings Volume 6473, Gallium Nitride Materials and Devices II; 64730Z (2007) https://doi.org/10.1117/12.704855
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

Abstract

We demonstrate the potential of Kelvin Probe Force Microscopy (KPFM) for analyzing degradation effects in GaN-based laser diodes (LDs). Thereby, the surface potential at the mirror facet was measured locally for both, unbiased LDs and LDs exposed to a well-defined current. In the unbiased case, our KPFM measurements demonstrate the impact of aging on the mirror facet, which we attribute to a photon enhanced facet oxidation. In case of an externally applied voltage, the local variation of the Kelvin voltage across the heterostructure layer sequence is analyzed. A clear correlation between macroscopic I-V-characteristics and the microscopic data obtained with the KPFM is found.

Citation Download Citation

André Lochthofen, Wolfgang Mertin, Gerd Bacher, Michael Furitsch, Georg Brüderl, Berthold Hahn, Uwe Strauss, and Volker Härle "Degradation studies of InGaN/GaN heterostructure laser diodes using a Kelvin Force Microscope", Proc. SPIE 6473, Gallium Nitride Materials and Devices II, 64730Z (8 February 2007); https://doi.org/10.1117/12.704855

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