Characteristics of a tunneling quantum-dot infrared photodetector operating at room temperature

Abstract

We report high-temperature ͑240-300 K͒ operation of a tunneling quantum-dot infrared photodetector. The device displays two-color characteristics with photoresponse peaks at ϳ6 m and 17 m. The extremely low dark current density of 1.55 A / cm 2 at 300 K for 1 V bias is made possible by the tunnel filter. For the 17 m absorption, the measured peak responsivity is 0.16 A / W ͑300 K͒ for a bias of 2 V and the specific detectivity D * is 1.5ϫ 10 7 cm Hz 1/2 /W ͑280 K͒ for a bias of 1 V. Excellent performance characteristics are also measured for the 6 m photoresponse.

Comparison studies of infrared photodetectors with a quantum-dot and a quantum-wire base

“…It is assumed that the QDIP active region is lightly doped by donors. The quantum−dot infrared photo− detector has emerged as an interesting and potentially viable device, wherein three−dimensional quantum confinement promises low dark currents [12,13], leading to a large detec− tivity [7]. We focus on QDIPs with multiple QD arrays of large−size QDs.…”

“…This drawback has been overcome by using diffraction gra− tings, prisms or a slop edge profile of pixels, adding to the fabrication and structural complexity. To address the limita− tions of QWIP detectors, there has been significant interest in IR detectors with lower dimensions such as quantum wires (1D) [2,[4][5][6] and quantum dots (0D) [7,8]. The use of quantum dots and quantum wires for IR detection provides many advantages [2,3].…”

Block Diagram Programming of Quantum Dot Sources and Infrared Photodetectors for Gamma Radiation Detection Through VisSim

“…It was calculated from the noise density spectra and the peak responsivity [19]. The detectivity of QDIP is determined by the following equation [20][21][22][23];…”

Room temperature absorption in laterally biased quantum infrared detectors fabricated by MBE regrowth

“…In those cases, thick AlGaAs layers are normally grown at both sides of the structure to further reduce the dark current. With these considerations, it is possible to find some works reporting single QDIP devices working at room temperature [6,7].…”