Band offset in (Ga, In)As/Ga(As, Sb) heterostructures

Band-gap design of quaternary (In,Ga)(As,Sb) semiconductors via the inverse-band-structure approach.

Quaternary systems illustrated by (Ga,In)(As,Sb) manifest a huge configurational space, offering in principle the possibility of designing structures that are lattice matched to a given substrate and have given electronic properties (e.g., band gap) at more than one composition. Such specific configurations were however, hitherto, unidentified. We show here that using a genetic-algorithm search...

Strain-Induced Band Gap Engineering in Selectively Grown GaN-(Al,Ga)N Core-Shell Nanowire Heterostructures.

We demonstrate the selective area growth of GaN-(Al,Ga)N core-shell nanowire heterostructures directly on Si(111). Photoluminescence spectroscopy on as-grown nanowires reveals a strong blueshift of the GaN band gap from 3.40 to 3.64 eV at room temperature. Raman measurements relate this shift to compressive strain within the GaN core. On the nanoscale, cathodoluminescence spectroscopy and scann...

The Synthesis of NiO/TiO2 Heterostructures and Their Valence Band Offset Determination

Heterojunction band offset engineering

Control of band discontinuities in semiconductor heterostructures may introduce a new important degree of freedom in the design of heterojunction devices and allow independent optimization of carrier injection, carrier confinement and ionization thresholds in high speed and optoelectronic devices. We will review recently proposed methods to microscopically control heterojunction parameters by m...

Suppression of intervalley scattering in Ga„As...Sb quantum wells

Femtosecond time-resolved reflectivity was measured near the 1.55 mm absorption edge of several GaAsxSb12x /AlSb quantum well samples. On the basis of differences in the reflectivity recovery kinetics and plateau values, we deduce that G – L intervalley scattering can be effectively suppressed for x>0.19. This is consistent with calculations incorporating confinement and strain effects which gi...