Quantum dot structures grown on Al containing quaternary material for infrared photodetection beyond 10μm

Abstract

Different InAs quantum dot structures grown on InGaAlAs lattice matched to InP were investigated for quantum dot infrared photodetectors. Extremely narrow photocurrent peaks were observed, demonstrating great potential for fine wavelength selection. Structures which can detect radiation beyond 10μm were developed. Polarization dependence measurements showed that the structures have a zero-dimensional character and are suitable for detection of normal incident light. On the other hand, structures containing coupled quantum wells showed a hybrid two-dimensional/zero-dimensional behavior.

Computational intelligence applied to the growth of quantum dots

“…Equivalent structures have been used in the development of QD infrared photodetectors, and are described in great detail elsewhere [5]. The QD height and density of the grown samples were determined by atomic force microscopy (AFM).…”

Study of Electronic and Optical Properties in Double Quantum Dots

“…O Hamiltoniano k.p está descrito em detalhes em [6]. Em geral, cada componente do espinor tem a forma F ± n,L,m (ρ, φ, z) = A n,L J L (K L n ρ) e ±iLφ √ 2π f ± m (z), onde A n,L de normalização, J L (µ L n ρ/R))é a função de Bessel e f ± m (z) = 1 √ Hz sen mπ 1 2 − z Hz [7]. O sinal mais em f ± m (z corresponde ao número quântico m par e o sinal de menos a mímpar.…”

Negative photoconductance in a biased multiquantum well with filter barriers

“…[2][3][4] Nowadays, fuelled by technological innovation, old physical concepts and phenomena found in semiconductor heterostrutures have been revived and broad avenues are still open for designing new devices ranging from quantum cascades lasers, 5,6 and, for the sake of our interest, to the infrared (IR) photodetectors based on intrasubband tunnelling between states localized in quantum wells [7][8][9][10] or/and quantum dots (QD), [11][12][13][14][15] and superlattices. [16][17][18] Even though most of these devices are now commercially available, there are presently a lot of unresolved questions concerning the optimal design and even the basic physical mechanisms underlying the behavior of these systems.…”