Characteristics of In(Ga)As quantum ring infrared photodetectors

Abstract

Characteristics of In͑Ga͒As quantum ring infrared photodetectors ͑QRIPs͒ were investigated under normal incidence configuration. Compared with quantum dot infrared photodetectors ͑QDIPs͒, QRIPs showed wider photocurrent spectra, more stable responsivity with temperature change, and lower dark current activation energy. The wide detection band comes from the transitions from the quantum ring ͑QR͒ ground states to different excited states. The shallow confinement states generate higher dark current and enhance the carrier flow between the QRs within the same QR layer. This carrier flow averages out the repulsive potential and makes QRIPs behave similarly to the quantum well infrared photodetectors instead of QDIPs. With an Al 0.27 Ga 0.73 As current blocking layer, the performance of QRIPs was greatly enhanced.

Propiedades electrónicas de un anillo cuántico elíptico con sección transversal rectangular

“…De ese modo, considerados el caso elíptico como una muy buena generalización de los QRs cuasi-bidimensionales. Dentro de las aplicaciones que se pueden encontrar para los QRs están los sensores en el rango del infrarrojo medio y de los THz, como medio activo de los láseres, memorias y dispositivos de la spintrónica, Wu et al (2012); Mano et al (2007); Ling et al (2009); Baker et al (2007); Lee et al (2006); Rosas, Riera y Marín (2000).…”

Effects of Geometry on the Electronic Properties of Semiconductor Elliptical Quantum Rings

“…Thus, it becomes interesting to investigate the elliptically-shaped QRs. Besides, being more realistic, they actually have potential applications, such as gain medium in lasers, medium-infrared and THz range detectors 31 – 34 . A special use for THz range devices is the detection of explosives at a distance, since the substances that usually compose them have a response at those frequencies 35 .…”

Optical absorption and refractive index changes in a semiconductor quantum ring: Electric field and donor impurity effects

“…()). Both kinds of systems are subjects of great interest among researchers due to their prospective applications in the design and production of optoelectronic devices . Going beyond the case of single nanostructures, the artificial molecules consisting of coupled QDs or QRs are particularly attractive for quantum information processing () and terahertz device production ().…”