化学液相沉积Al2O3薄膜钝化p型黑硅
首发时间:2013-04-28
摘要:本文采用易操作成本低的化学液相沉积法(CLD)在p型黑硅衬底上沉积了均匀的Al2O3钝化层,研究了不同退火温度(300、600和900℃)对钝化层物理特性以及钝化效果的影响。实验发现Al2O3钝化层增强了黑硅的反射率。由于钝化层中的氧元素含量较少导致化学液相沉积出来Al2O3中的固定负电荷含量较少,并且固定负电荷密度随退火温度的增加而减少。通过瞬态表面光伏谱(SPV)的测量,发现300~600℃之间的退火温度能够获得较好的钝化效果。
关键词: 硅太阳能电池 Al2O3 表面钝化 黑硅 化学液相沉积 退火温度
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The Passivation of p-type Black Silicon with Al2O3 Deposited by Chemical Liquid Phase Deposition
Abstract:In this paper,uniform Al2O3 films were deposited on p-type black silicon (b-Si) substrates by simple and low-cost chemical liquid phase deposition (CLD). The influence of annealing temperatures on physics properties and passivation effect of Al2O3 films were investigated. After annealed at 300, 600, and 900 ℃, the extremely low reflectance of b-Si increased approximately 4%. For the lack of interstitial O near the passivation interface, no obvious fixed negative charge was measured. Yet the responses of transient surface photovoltage (SPV) demonstrated that a better passivation effect of p-type b-Si can be obtained after annealed during the temperature from 300 to 600 ℃ by Al2O3.
Keywords: silicon solar cells Al2O3 surface passivation black silicon chemical liquid phase deposition annealing temperature
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