金属纳米颗粒对有机太阳能电池光吸收效率影响的研究

借助时域有限差分法,对几种常见金属纳米颗粒影响有机太阳能电池光吸收效率的因素及其内部物理机制进行了研究.首先对金属纳米颗粒激发局域表面等离子共振的场分布特点进行分析,对比其在电池不同功能层中对光吸收率的影响；其次基于米氏理论与电共振效应,得出金属纳米颗粒的结构参量对局域表面等离子共振位置及强度的影响规律,并以此进行优化设计.结果表明,具有高对称性形貌的金属纳米颗粒以小尺寸密堆积结构引入电池活性层,能够促进电池光吸收增强三倍以上.

A Study of Influences of Metal Nanoparticles on Absorbing Efficiency of Organic Solar Cells

Based on the finite difference time domain method, factors and physical mechanism of different kinds of common metal nanoparticles are studied that influence the absorption efficiency of organic solar cells. With the analysis of field distribution of localized surface plasmon resonance stimulated by metal nanoparticles, effects of metal nanoparticles in different functional layers on the absorption efficiency of organic solar cell are compared. According to Mie theory and electrical resonance effect, the relationship between the structural parameters of metal nanoparticles and the influences they have on the position and intensity of localized surface plasmon resonance is found, and an optimized design of organic solar cells is proposed. The result shows that when small and highly symmetrical metal nanoparticles are closely packed into the active layer of a solar cell, more than three times light absorption enhancement can be achieved.