Auger

About: Auger is a research topic. Over the lifetime, 5373 publications have been published within this topic receiving 94076 citations.

Quantization of multiparticle auger rates in semiconductor quantum dots

Abstract: We have resolved single-exponential relaxation dynamics of the 2-, 3-, and 4-electron-hole pair states in nearly monodisperse cadmium selenide quantum dots with radii ranging from 1 to 4 nanometers. Comparison of the discrete relaxation constants measured for different multiple-pair states indicates that the carrier decay rate is cubic in carrier concentration, which is characteristic of an Auger process. We observe that in the quantum-confined regime, the Auger constant is strongly size-dependent and decreases with decreasing the quantum dot size as the radius cubed.

Auger recombination in InGaN measured by photoluminescence

Abstract: The Auger recombination coefficient in quasi-bulk InxGa1−xN (x∼9%–15%) layers grown on GaN (0001) is measured by a photoluminescence technique. The samples vary in InN composition, thickness, and threading dislocation density. Throughout this sample set, the measured Auger coefficient ranges from 1.4×10−30to2.0×10−30cm6s−1. The authors argue that an Auger coefficient of this magnitude, combined with the high carrier densities reached in blue and green InGaN∕GaN (0001) quantum well light-emitting diodes (LEDs), is the reason why the maximum external quantum efficiency in these devices is observed at very low current densities. Thus, Auger recombination is the primary nonradiative path for carriers at typical LED operating currents and is the reason behind the drop in efficiency with increasing current even under room-temperature (short-pulsed, low-duty-factor) injection conditions.

Laparoscopic tissue retrieval device and method

Abstract: A material retrieval instrument, particularly for retrieving biological tissue. In one embodiment, the instrument comprises a cylindrical sheath having a distal end and a proximal end; an auger disposed in the sheath for rotation therein, the auger having a cutting blade disposed thereon, the cutting blade extending from the distal end of the sheath for engagement with tissue to be retrieved, the auger including a central longitudinal opening, the opening receiving an engaging member adapted to extend from the auger for engaging tissue to move the tissue into engagement with the cutting blade on the auger; the auger being rotatable in the sheath and comprising a conveyor for moving cut tissue longitudinally along the auger in the sheath to a tissue receiving reservoir; and a device for rotating the auger. In another embodiment, the instrument has an opening in a cylindrical surface of the sheath into which tissue to be excised can be fed for engagement with the cutting blade of the auger and subsequent removal.