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Comparison of tunnel junctions for cascaded InAs/GaSb superlattice light emitting diodes
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Image of FIG. 1.
FIG. 1.

(Color online) Schematic of an electron cascading through two MWIR superlattice emission stages joined with an n-Al0.20In0.80AsSb/p-GaSb tunnel junction. The junction here is biased at 0.7 V (electric field of 0.7 V/0.96 um). Simulation done with one-dimensional diode software.

Image of FIG. 2.
FIG. 2.

(Color online) Intrinsic band offsets and bandgaps of materials used on the n-side of the tunnel junction in comparison to GaSb, which is used on the p-side of the junction. Bandgaps and offsets from Ref. 18.

Image of FIG. 3.
FIG. 3.

(Color online) Stack diagram of four-stage cascaded LEDs. For the series presented here, the n-side material and/or doping of the tunnel junction was varied.

Image of FIG. 4.
FIG. 4.

(Color online) AFM scans of four of the tunnel junctions. In each case, step flow growth of the surface is visible, showing each sample had an atomically smooth surface. Surface roughness and defect density are summarized in Table I for the tunnel junctions: (a) p-GaSb/n-GaSb, (b) p-GaSb/n-symmetrically doped sl grade, (c) p-GaSb/n-GaInAsSb, and (d) p-GaSb/n-AlInAsSb. Not shown are the p-GaSb/n-undoped graded SL and the p-GaSb/n-asymmetrically doped graded SL.

Image of FIG. 5.
FIG. 5.

(Color online) (a) 77 K LI curves of 100 × 100 um2 mesa SLED tunnel junction series and (b) associated wallplug efficiencies. Curves shown are the median of 8–10 devices for each sample. Current represents peak of 50 us current pulses at 1% duty cycle.

Image of FIG. 6.
FIG. 6.

(Color online) (a) 77 K IV curves and (b) dynamic resistance (dV/dI) of the tunnel junction series corresponding to the LI curves in Fig. 5.


Generic image for table

Summary of tunnel junction design, doping, RMS roughness, and defect density of different cascaded LED samples.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Comparison of tunnel junctions for cascaded InAs/GaSb superlattice light emitting diodes