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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Size effects of metal nanoparticles embedded in a buffer layer of organic photovoltaics on plasmonic absorption enhancement
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Size effects of metal nanoparticles embedded in a buffer layer of organic photovoltaics on plasmonic absorption enhancement

机译：嵌入有机光伏缓冲层中的金属纳米粒子对等离子体吸收增强的尺寸效应

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摘要

The effects of Au or Ag nanoparticles on optical absorption enhancement of organic photovoltaics based on blended poly(3-hexylthiophene):phyenyl-C61- butyric acid methyl ester (P3HT:PCBM) were investigated using a finite-difference-time-domain method. The spherical metal nanoparticles were embedded in a buffer layer of thickness 20nm and their size was varied from 10 to 50nm. The metal nanoparticles with diameter 1020nm offered negligible absorption enhancement in the active layer. Unlike those short metal nanoparticles, the incorporation of metal nanoparticles taller than the buffer layer led to a significant absorption enhancement by plasmonic resonance especially in the case of Ag nanoparticles. Ag nanoparticles gave broader and stronger absorption enhancement in the active layer than Au nanoparticles. An enhancement of 34% in the optical absorption of the active layer was observed with Ag nanoparticles of 50nm diameter at 10% coverage. The electric field distributions around metal nanoparticles, their self-absorption and the active layer thickness dependence on the absorption enhancement were studied.
机译：利用时域有限差分法研究了金或银纳米粒子对基于混合的聚（3-己基噻吩）：烯基-C61-丁酸甲酯（P3HT：PCBM）的有机光伏的光吸收增强的影响。球形金属纳米粒子嵌入厚度为20nm的缓冲层中，其大小从10到50nm不等。直径为1020nm的金属纳米颗粒在活性层中的吸收增强可忽略不计。与那些短的金属纳米颗粒不同，比缓冲层高的金属纳米颗粒的引入导致了通过等离子体共振的显着吸收增强，特别是在Ag纳米颗粒的情况下。与Au纳米颗粒相比，Ag纳米颗粒在活性层中的吸收增强更大，更强。用10nm覆盖率的50nm直径的Ag纳米颗粒观察到活性层的光吸收增加了34％。研究了金属纳米粒子周围的电场分布，它们的自吸收以及活性层厚度对吸收增强的依赖性。

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