Polarization-balanced design of heterostructures: Application to AlN/GaN double-barrier structures

Berland, Kristian, 1983 (author): Chalmers tekniska högskola,Chalmers University of Technology

Andersson, Thorvald, 1946 (author): Chalmers tekniska högskola,Chalmers University of Technology

Hyldgaard, Per, 1964 (author): Chalmers tekniska högskola,Chalmers University of Technology

(creator_code:org_t)

2011
2011
English.
In: Physical Review B - Condensed Matter and Materials Physics. - 2469-9950 .- 2469-9969. ; 84:24

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Abstract Subject headings

Inversion and depletion regions generally form at the interfaces between doped leads ( cladding layers) and the active region of polar heterostructures like AlN/GaN and other nitride compounds. The band bending in the depletion region sets up a barrier that may seriously impede perpendicular electronic transport. This may ruin the performance of devices such as quantum-cascade lasers and resonant-tunneling diodes. Here we introduce the concepts of polarization balance and polarization-balanced designs: A structure is polarization balanced when the applied bias match the voltage drop arising from spontaneous and piezeolectric fields. Devices designed to operate at this bias have polarization-balanced designs. These concepts offer a systematic approach to avoid the formation of depletion regions. As a test case, we consider the design of AlN/GaN double-barrier structures with Al((x) over tilde)Ga(1-(x) over tilde)N leads. To guide our efforts, we derive a simple relation between the intrinsic voltage drop arising from polar effects, average alloy composition of the active region, and the alloy concentration of the leads. Polarization-balanced designs secure good filling of the ground state for unbiased structures, while for biased structures with efficient emptying of the active region they remove the depletion barriers.

TEKNIK OCH TEKNOLOGIER -- Annan teknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies (hsv//eng)
NATURVETENSKAP -- Fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Kommunikationssystem (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Communication Systems (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Nanoteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Nano-technology (hsv//eng)
NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

By the author/editor: Berland, Kristia ...; Andersson, Thorv ...; Hyldgaard, Per, ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Communication Sy ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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