A Study on Multi-quantum Barriers Utilizing Electron-wave Interference in Semiconductors

目前大多数半导体激光器都采用双异质结构（HD）来实现光场约束和载流子约束。为了防止电子漏过p型包层的异质势垒，通常需要超过300 meV的内置电位差。但在某些情况下，如高功率和高温操作，更高的势垒高度是可取的。然而，由于材料的限制，有时无法获得足够的势垒高度，例如，在短波长基于GaAlInP的红橙色激光器和基于II-VI的蓝绿色ZnCdSSe或蓝色ZnMgSSe系统中。为了实现器件的高性能，我们不仅要关注半导体激光器的主动引擎，还要关注包层。提高有效势垒高度的方法之一是对p包层进行高掺杂，另一种方法是利用量子效应，即多量子势垒（MQB）。MQB是一种可以通过干涉反射电子的半导体超晶格。CQB是一种可以通过干涉反射电子的半导体超晶格。本文首先介绍了它的原理和设计思想，然后综述了装载mqb的半导体激光器和隧道二极管的最新进展。结果表明，可见光GaAlInP/GaInP激光器的工作温度可提高20 K。此外，还对长波长激光器进行了一些设计和实验研究。一个有趣的特点是防止螺旋钻热电子通过包层泄漏的可能性。

we use the double heterostructure (HD) in most of current semiconductor lasers for the purpose of confinement of both optical field and carriers as well. In order to prevent electrons from leaking over the hetero-barrier of a p-type cladding, it is known that more than 300 meV of built-in potential difference is usually required. But in some cases such as high power and high temperature operations, much higher barrier height is preferable. However, enough barrier height is not sometimes available due to the material limitation, e.g., in short wavelength GaAlInP based red-orange lasers and II-VI based blue-green ZnCdSSe or blue ZnMgSSe systems.We have to pay attention not only to the active engine of semiconductor lasers, but also to the cladding layer to achieve high performance devices. One of the ways to increase the effective barrier height is to dope high to p-cladding, and another is to use the quantum effect, i.e., multi-quantum barrier (MQB). The MQB is a semiconductor super-lattice which can reflect electrons by interference.The CQB is a semiconductor super-lattice which can reflect electrons by interference. In this paper we first introduce its principle and design concept and then review the recent progress of MQB-loaded semiconductor lasers and tunneling diodes. It has been pointed out that the operating temperature of visible GaAlInP/GaInP lasers, to red, can be raised up by 20 K. Also, some design and experimental studies for long wavelength lasers have been made. One of interesting features is a possibility of preventing the auger hot electron from leaking through the cladding.