材料科学
光电流
吸收(声学)
光伏
纳米线
太阳能电池
光电子学
光伏系统
光学
制作
叠加原理
物理
复合材料
病理
生物
替代医学
医学
量子力学
生态学
作者
Xin Yan,Lei Gong,Lingmei Ai,Wei Wei,Xia Zhang,Xiaomin Ren
出处
期刊:Optics Express
[The Optical Society]
日期:2018-12-19
卷期号:26 (26): A974-A974
被引量:9
摘要
A multi-diameter p-i-n junction GaAs nanowire (NW) array architecture is proposed for high-performance solar cells. Coupled three-dimensional optoelectronic simulations are performed to investigate the photovoltaic properties. The NW diameters are randomly selected within the range of 220-400 nm, following the Gaussian distribution. The results show that the absorption strongly depends on the diameter, and the multi-diameter NW array exhibits higher optical absorption, in comparison with the uniform-diameter counterpart. This is because of the superposition of multiple absorption peaks. Moreover, the multi-diameter NW array can efficiently enhance the effective absorption; that is, the depletion region absorption, which directly leads to increased photocurrent. A remarkable efficiency of 17% is obtained for a 16-diameter NW array solar cell with a full width at half maximum of the diameter distribution of 75 nm, higher than the best value (16.1%) of uniform-diameter device with an optimum diameter of 310 nm. This work demonstrates that the native diameter nonuniformity of self-organized nanowires is beneficial for high-performance photovoltaics with low cost and a simple fabrication process.
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