Metal-Free Graphene as Transparent Electrode for GaN-Based Light-Emitters
Artikel i vetenskaplig tidskrift, 2013

Graphene contacts to p-GaN are considered as an alternative to indium–tin-oxide transparent electrodes in GaN based vertical-cavity surface-emitting lasers (VCSELs). Contact properties were investigated on light-emitting diode and p-GaN test structures, where dielectric apertures were used to eliminate the influence of the metal pads used to bias the contacts. Using single layer graphene we were able to operate light emitting diodes with current densities of 300 A/cm2. Addition of a second layer of graphene increased the maximum bias current to 1 kA/cm2. However, the contacts are non-linear and cannot withstand high current densities for a long time. The results are promising but further investigation and improvement is needed for graphene to be a viable alternative to indium–tin-oxide for blue VCSELs.

Författare

Martin Stattin

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

César Javier Lockhart de la Rosa

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Jie Sun

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Avgust Yurgens

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Åsa Haglund

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Japanese Journal of Applied Physics

0021-4922 (ISSN)

Vol. 52 8 PART 2 08JG05- 08JG05

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Telekommunikation

Infrastruktur

Nanotekniklaboratoriet

DOI

10.7567/JJAP.52.08JG05