正面半球型Ag纳米粒子对硅薄膜光吸收效率影响的研究

发布时间：2018-03-11 18:35

本文选题：单晶硅薄膜太阳能电池　切入点：Ag纳米粒子　出处：《长春理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：如今太阳能电池的发展越来越迅速,如何把太阳能电池高效的转换成人类所需能源,是我们人类需要努力实验和去尝试的目标。人们为了使局域共振场增大强度,所以人们加入了相应的金属钠米粒子。这样加入纳米金属离子就可以产生表面等离子体振荡,在这种情况下,横截面增大都是在共振之前,这样太阳能电池内部光所走的路径就增加,有源介质的吸收也会增大,这样就完成我们最初的目标——让太阳能电池对光的吸收增强。把半球型的Ag纳米粒子放在太阳能电池的正面,太阳能电池的基底用单晶体硅,用我们学过的时域有限差分法的内容,对这样的结构进行模拟实验的研究,从而研究它的光吸收增益。本篇文章进行模拟在其中改变一部分因素观察其对增益的影响,如:改变纳米粒子直径、改变周期、改变钝化层的厚度、光的入射角度。进行模拟试验后可以得出,用800纳米硅为基地的时候、100纳米作为纳米粒子的高度时候,400纳米作为纳米粒子的直径,底面积与正方形面积的反比值在纳米粒子的单位周期为0.835时,在这一时刻可以得到最大的光吸收,其增益为1.862。这样之后,开始加入SiO2钝化层并改变它的厚度,它是在硅基底与Ag纳米粒子之间加入。这样可以观察到光在不同钝化层厚度情况下对增益有着不同的影响,通过模拟实验得出450纳米硅基底时候,90纳米是纳米粒子高度时候、90纳米是纳米粒子直径时候,其单位周期正方形面积与底面积的反比值为0.5时,光吸收效益为1.616也是最强吸收效益。
[Abstract]:Nowadays, solar cells are developing more and more rapidly. How to convert solar cells efficiently into the energy we need is the goal that we need to experiment and try hard. People want to increase the intensity of local resonance field. So people add the corresponding metal sodium particles, and then add the nanometallic ions to create surface plasma oscillations, and in this case, the cross-section increases before resonance. In this way, the path of light inside the solar cell will increase, and the absorption of the active medium will also increase. And that would accomplish our initial goal of increasing the absorption of light by solar cells, putting the hemispherical Ag nanoparticles on the front of the solar cells, the monocrystalline silicon on the substrate of the solar cells. By using the contents of the finite-difference time-domain method we have studied the optical absorption gain of this kind of structure by means of simulation experiments. In this paper, the influence of some factors on the gain is observed by changing some of the factors. For example, changing the diameter of nanoparticles, changing the period, changing the thickness of the passivation layer, the incident angle of light. With 800 nanocrystalline silicon as the base, 100 nanometers as the height of the nanoparticles and 400 nanometers as the diameter of the nanoparticles, the inverse ratio of the bottom area to the square area is 0.835 when the unit period of the nanoparticles is 0.835. The maximum light absorption can be achieved at this point, with a gain of 1.862. After that, the SiO2 passivation layer is added and its thickness is changed. It is added between the silicon substrate and the Ag nanoparticles, and it can be observed that the light has different effects on the gain under different passivation layer thickness. The simulation results show that the time of 450 nanocrystalline silicon substrate is when 90 nm is the height of nanometer particle, and the inverse ratio of square area per unit period to bottom area is 0.5, when the nanocrystalline is the diameter of nanocrystalline particle. The light absorption benefit was 1.616 and the strongest was also the light absorption benefit.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM914.4

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