Review
Version 1
Preserved in Portico This version is not peer-reviewed
Diffusion-Driven Charge Transport in Light Emitting Devices
Version 1
: Received: 31 October 2017 / Approved: 31 October 2017 / Online: 31 October 2017 (16:06:44 CET)
A peer-reviewed article of this Preprint also exists.
Kim, I.; Kivisaari, P.; Oksanen, J.; Suihkonen, S. Diffusion-Driven Charge Transport in Light Emitting Devices. Materials 2017, 10, 1421. Kim, I.; Kivisaari, P.; Oksanen, J.; Suihkonen, S. Diffusion-Driven Charge Transport in Light Emitting Devices. Materials 2017, 10, 1421.
Abstract
Almost all modern inorganic light-emitting diode (LED) designs are based on double heterojunctions (DHJs) whose structure and current injection principle have remained essentially unchanged for decades. Although highly efficient devices based on the DHJ design have been developed and commercialized for energy-efficient general lighting, the conventional DHJ design requires burying the active region (AR) inside a pn-junction. This has hindered the development of emitters utilizing nanostructured ARs located close to device surfaces such as nanowires or surface quantum wells. Modern DHJ III-N LEDs also exhibit resistive losses which arise from the DHJ device geometry. The recently introduced diffusion-driven charge transport (DDCT) emitter design offers a novel way to transport charge carriers to unconventionally placed ARs. In a DDCT device, the AR is located apart from the pn-junction and the charge carriers are injected into the AR by bipolar diffusion. This device design allows the integration of surface ARs to semiconductor LEDs and offers a promising method to reduce resistive losses in high power devices. In this work, we present a review of the recent progress in gallium nitride (GaN) based DDCT devices, and an outlook of potential DDCT has for opto- and microelectronics.
Keywords
selective-area growth (SAG); diffusion injection; light-emitting diodes (LEDs); lateral epitaxial overgrowth
Subject
Chemistry and Materials Science, Nanotechnology
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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