Controlling of Polarity on the Surface Passivation Mechanism of Al2O3 for Black Silicon by CLD

Controlling of Polarity on the Surface Passivation Mechanism of Al2O3 for Black Silicon by CLD
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CLD控制黑硅Al2O3表面钝化机理的极性

DOI:
10.4028/www.scientific.net/jnanor.49.18
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发表时间:
2017-09
影响因子:
1.7
通讯作者:
Liu Aimin
Liu Aimin
中科院分区:
材料科学4区
文献类型:
--
作者:
Zhang Bingye;Wang Yujun;Han Lu;Li Yongxiang;Liu Aimin

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采用化学液相沉积(CLD)技术在p型黑硅(b-Si)衬底上沉积了Al 2 O3薄膜。研究了退火温度对Al 2 O3薄膜结构和光学性能的影响。具有80 nm Al 2 O3膜的b-Si具有5%的低全反射率。经300 °C退火处理的样品具有负固定电荷,密度为1.5×1012 cm-2。随着退火温度的升高,C-V曲线负移,固定电荷极性正移,最大密度为8.7×1011 cm-2。固定电荷极性的演变归因于Al_2O_3晶型转变引起的O:Al比的降低。Al 2 O3中固定电荷极性的改变为通过调整热后处理工艺实现Si太阳电池中p型和n型Si钝化提供了一条可行的途径。
Thin Al2O3 films were deposited on p-type black silicon (b-Si) by using chemical liquid phase deposition (CLD) technique. The influence of annealing temperatures on the structural and optical properties of Al2O3 films was investigated. The b-Si with 80-nm Al2O3 films exhibits a low total reflectance of 5%. The sample annealed 300 °C exhibits negative fixed charge with the density of 1.5×1012 cm-2. With the increasing of annealing temperature, negative shift of C-V curve was observed, indicating the polarity of fixed charge changes to positive, with maximal the density of 8.7×1011 cm-2. The evolution of the polarity of fixed charge is assigned to the decreasing of O: Al ratio caused by the transition of the crystalline type of Al2O3. The change of fixed charge polarity in Al2O3 provides a feasible route for both p- and n-type Si passivation in Si solar cells by adjusting the thermal post-treatment.
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