光伏电池转换效率瓶颈是制约太阳能市场发展的根本原因。近年来基于纳米颗粒表面等离子振荡效应的研究成为突破该技术瓶颈的最具潜力方向之一,但该类研究尚处于初步阶段。为此，本项目将开展二维纳米颗粒阵列表面等离子体对太阳光子增强吸收的系统性理论和实验研究，同时揭示稀土复合纳米材料对近红外光子光电转换增强效果和机制。研究主要包括：1）二维金属纳米颗粒阵列中表面等离子体波的场耦合及其增强吸收机制；2）通过掺杂稀土氧化物复合，调制该复合材料对600nm-1800nm波段光子的宽频振荡及吸收增强；3）复合材料对吸收的近红外光子上转换效应增强机理。此项研究的顺利开展不仅会深刻揭示二维复合纳米颗粒阵列表面等离子的增强吸收机制，也为形成突破当前技术瓶颈的第四代光伏产业化技术打下基础。

The bottleneck of the current PV cell efficiency is the root reason of blocking the expansion of the solar market nowadays. The surface plasma polaritons effect of nanoparticles for light trapping becomes one of the most promising techniques to overcome the trouble, emerging in recent years. However, those researches are at its early stage now. Herein, both theoretic and experimental studies on the inter-particle and near field electromagnetic field coupling in a 2D metal nanoparticle array and its enhancement for solar cell efficiency, will be systematically studied in this project, as well as the enhancement of conversion from the trapped near-IR photons to electron-hole pairs by means of rare-earth doped nano-composite. It mainly includes: 1) the field coupling mechanism of the 2D metal nanoparticle array, including inter-particle and near field, and its enhancement mechanism for light tapping; 2) enhancing broadband absorption of solar photons in experiment, especially from 600nm to 1800nm, by compounding the metal nanoparticles with rare earth doped oxides; 3) upgrading mechanism of the up-conversion efficiency of near-red photons trapped in the devices through tuning rare-earth composites. The successful fulfillment of this project will not only reveal the essential mechanism of surface plasma polaritons in 2D composite nanoparticle array, but also pay the way for its further applications in the fourth-generation solar cell industries.