微晶硅锗太阳电池的仿真与优化

发布时间：2018-06-17 02:41

本文选题：光伏发电 + 微晶硅锗薄膜　；参考：《东北电力大学》2017年硕士论文

【摘要】：现如今,电力系统中的主要光伏电源是晶体硅太阳电池。由于晶体硅太阳电池在继续提高转换效率和降低成本方面都遇到了困难,这使其上网电价远高于传统能源的上网电价。相比之下,硅基薄膜太阳电池具有成本低,弱光响应好等优点,将其用于光伏发电有望进一步节省成本,降低光伏并网电价。目前,影响其竞争力的主要因素是转换效率较低。微晶硅锗是近几年被提出应用于薄膜太阳电池中的新型窄带隙材料,具有吸收系数高,红外光响应好等特点,将其应用于叠层硅基薄膜太阳电池的底电池中,可以有效提高电池的光电转换效率。本文采用计算机仿真的方式对微晶硅锗太阳电池进行研究,通过新结构的提出以优化其光电性能。首先,应用太阳电池仿真软件wxAMPS建立并优化了本征层具有渐变带隙结构的微晶硅锗太阳电池,与具有相同锗含量非渐变电池相比,其转换效率提高了36%。并且在传统线性渐变结构的基础上,优化出了一种沿曲线渐变的新型电池结构,使得优化后的曲线渐变微晶硅锗太阳电池转换效率达到13.82%。然后,在微晶硅锗太阳电池的p/i界面添加了非晶硅锗缓冲层,并从锗含量和厚度两个方面对缓冲层进行优化,使电池的短路电流和开路电压进一步得到提高,转换效率提升4.5%。最后,建立了非晶硅/非晶硅锗/微晶硅/微晶硅锗四结叠层太阳电池,并将优化后的曲线渐变微晶硅锗电池用于四结电池的底电池,使得叠层电池的转换效率达24.8%。同具有相同锗含量的非渐变微晶硅锗电池以及微晶硅电池作为底电池时相比,四结电池的效率分别提高8.7%和16.7%。研究结果显示了微晶硅锗在硅基薄膜太阳电池中的应用潜力。
[Abstract]:Nowadays, the main photovoltaic power in the power system is crystal silicon solar cell. Because of the difficulty in improving the conversion efficiency and reducing the cost, the crystal silicon solar cell is much more expensive than the traditional energy. In contrast, the silicon based thin film solar cell has a low cost and a good weak light response. At present, the main factor affecting its competitiveness is the low conversion efficiency. Microcrystalline silicon germanium is a new type of narrow gap material used in thin film solar cells in recent years, which has the characteristics of high absorption system and good response to infrared light, and applied it to superposition. In the bottom cell of the layer silicon based thin film solar cell, the photoelectric conversion efficiency of the battery can be effectively improved. In this paper, the microcrystalline silicon germanium solar cell is studied by computer simulation, and the photoelectric performance is optimized by the new structure. First, the application of the solar cell simulation soft wxAMPS is used to establish and optimize the eigenlayer with the tapered zone. The microcrystalline silicon germanium solar cell with the gap structure has improved the conversion efficiency by 36%. compared with the non graded cell with the same germanium content. On the basis of the traditional linear gradient structure, a new type of battery structure along the curve gradient is optimized, which makes the conversion efficiency of the optimized curve gradient microcrystalline silicon germanium solar cell reach 13.82%. and then, The amorphous silicon germanium buffer layer was added to the p/i interface of the microcrystalline silicon germanium solar cell, and the buffer layer was optimized from two aspects of the germanium content and thickness. The short circuit current and the open circuit voltage of the battery were further improved and the conversion efficiency was enhanced by 4.5%.. Finally, the amorphous silicon / amorphous silicon germanium / microcrystalline silicon / microcrystalline silicon germanium and four layers of laminated solar electricity were established. The optimized curve gradient microcrystalline silicon germanium battery is used in the bottom battery of four junction batteries, which makes the conversion efficiency of the laminated battery up to 24.8%. and the non graded microcrystalline silicon germanium battery with the same germanium content as well as the microcrystalline silicon battery as the bottom battery. The efficiency of the four junction battery increases by 8.7% and the 16.7%. study results show microcrystalline. Application potential of SiGe in silicon based thin film solar cells.
【学位授予单位】：东北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM914.4

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