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Deep level transient spectroscopy study of indium gallium arsenic nitride grown by MBE and MOCVD for multijunction solar cells.

机译:MBE和MOCVD制备的用于多结太阳能电池的氮化铟镓砷的深层瞬态光谱研究。

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摘要

The III-V compound semiconductor alloy InGaAsN, which may be used as a part of a electricity generating solar cell, has a potential up to 40% efficiency when put into a multilayer cell consisting of InGaP, GaAs and Ge. Although minority carrier electrons are not intentionally injected into the depletion region of the measured samples, electron traps are detected in both Schottky barrier and p-n junction InGaAsN and GaAsN samples and these have adversely affected the performance of such devices. Deep Level Transient Spectroscopy (DLTS)---a high frequency transient capacitance technique---has been used to detect traps in p-type GaAs, GaAsN, InGaAs and InGaAsN grown by Molecular Beam Epitaxy (MBE) and Metal Organic Chemical Vapor Deposition (MOCVD). Thermal annealing of minority carrier traps in p-type InGaAsN and GaAsN is investigated by using DLTS. Upon annealing, an apparent recovery of the photovoltaic properties is observed for InGaAsN and GaAsN diodes and solar cells correlating with changes in the DLTS data. This recovery reveals that nitrogen related E1 center has an important role in governing the solar cell performance.
机译:III-V族化合物半导体合金InGaAsN可以用作发电太阳能电池的一部分,当放入由InGaP,GaAs和Ge组成的多层电池中时,具有高达40%的电势。尽管没有将少数载流子电子故意注入到测量样品的耗尽区中,但在肖特基势垒和p-n结InGaAsN和GaAsN样品中都检测到了电子陷阱,这些陷阱对此类器件的性能产生了不利影响。深层瞬态光谱法(DLTS)-一种高频瞬变电容技术--已用于检测通过分子束外延(MBE)和金属有机化学气相沉积法生长的p型GaAs,GaAsN,InGaAs和InGaAsN中的陷阱(MOCVD)。利用DLTS研究了p型InGaAsN和GaAsN中少数载流子陷阱的热退火。退火后,观察到InGaAsN和GaAsN二极管以及与DLTS数据变化相关的太阳能电池的光伏性能有明显恢复。这种恢复表明与氮有关的E1中心在控制太阳能电池的性能方面具有重要作用。

著录项

  • 作者

    Kotamraju, Siva Prasad.;

  • 作者单位

    University of South Alabama.;

  • 授予单位 University of South Alabama.;
  • 学科 Engineering Electronics and Electrical.; Physics Condensed Matter.; Engineering Materials Science.
  • 学位 M.S.
  • 年度 2005
  • 页码 70 p.
  • 总页数 70
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;工程材料学;
  • 关键词

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