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Optical study of p-Doping in GaAs Nanowires for low-threshold and high-yield lasing

Alanis, Juan Arturo, Lysevych, Mykhaylo, Burgess, Tim, Saxena, Dhruv, Mokkapati, Sudha, Skalsky, Stefan, Tang, Xiaoyan, Mitchell, Peter, Walton, Alex S., Tan, Hark Hoe, Jagadish, Chennupati and Parkinson, Patrick 2019. Optical study of p-Doping in GaAs Nanowires for low-threshold and high-yield lasing. Nano Letters 19 (1) , pp. 362-368. 10.1021/acs.nanolett.8b04048

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Semiconductor nanowires suffer from significant non-radiative surface recombination; however, heavy p-type doping has proven to be a viable option to increase the radiative recombination rate and, hence, quantum efficiency of emission, allowing the demonstration of room-temperature lasing. Using a large-scale optical technique, we have studied Zn-doped GaAs nanowires to understand and quantify the effect of doping on growth and lasing properties. We measure the non-radiative recombination rate (knr) to be (0.14 ± 0.04) ps–1 by modeling the internal quantum efficiency (IQE) as a function of doping level. By applying a correlative method, we identify doping and nanowire length as key controllable parameters determining lasing behavior, with reliable room-temperature lasing occurring for p ≳ 3 × 1018 cm–3 and lengths of ≳4 μm. We report a best-in-class core-only near-infrared nanowire lasing threshold of ∼10 μJ cm–2, and using a data-led filtering step, we present a method to simply identify subsets of nanowires with over 90% lasing yield.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Chemical Society
ISSN: 1530-6984
Date of First Compliant Deposit: 4 March 2019
Date of Acceptance: 7 December 2018
Last Modified: 11 Mar 2020 23:18

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