嵌入金属纳米颗粒提高晶硅薄膜太阳能电池吸收率  

Embedding Metal Nanoparticles to Increase the Absorption Rate of Crystalline Silicon Thin Film Solar Cells

作　　者：肖亮 朱群志 XIAO Liang;ZHU Qunzhi(Collage of Energy and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China)

机构地区：[1]上海电力大学能源与机械工程学院,上海200090

出　　处：《光散射学报》2020年第3期266-273,共8页The Journal of Light Scattering

基　　金：国家自然科学基金项目(51576119)。

摘　　要：本文提出了一种在晶硅薄膜太阳能电池Si层中嵌入金属纳米颗粒的结构,通过控制金属纳米颗粒的形状、材料以及间距等因素,利用金属纳米颗粒表面激发出的局域表面等离激元共振效应(LSPR)提高晶硅薄膜太阳能电池对光的吸收。使用微纳光学仿真软件(FDTD)对不同条件下的Si层吸收率以及光生电子密度分布进行了仿真研究。研究发现,相较于未嵌入纳米颗粒的薄膜太阳能电池,当嵌入球形Ag纳米颗粒时,Si层吸收率在0.8~1.1m波段范围内有显著的提高,整体吸收率比未嵌入纳米颗粒Si层吸收率提高了23.1%,光生电子密度在纳米颗粒周围显著升高。嵌入Ag、Au、Cu、Al四种纳米颗粒的情况下,在0.45~1.1m波段范围内,吸收率曲线均出现波动,且嵌入Al纳米颗粒时可以激发出更宽波段范围内的吸收峰,当Al纳米颗粒存在时Si层的光生电子密度整体分布最好。在对两个Al纳米颗粒间距T为0.1m、0.15m和0.2m三种情况的分析中,当波段在0.45~0.75m波段范围内时,T为0.1m时吸收率表现较好;而在0.9m和1.0m波段附近T=0.15m时会激发出更宽的吸收峰,且高于T为0.1m和0.2m时的吸收率,Si层上部区域整体光生电子密度更高。In this paper,a structure of embedding metal nanoparticles in the Si layer of a crystalline silicon thin film solar cell is proposed.By controlling the shape,material and spacing of the metal nanoparticles,the LSPR effect excited by the metalnanoparticles surface is used to improve the absorption of light of crystalline silicon thin film solar cell.The micro-nano optical simulation software(FDTD)was used to simulate the Si layer absorption rate and photogenerated electron rate under different conditions.Compared with thin-film solar cells without embedded nanoparticles,when embedded in spherical Ag nanoparticles,the Si layer absorption rate is significantly improved in the range of 0.8~1.1m,the overall absorption rate is increased by 23.1%,and the photogenerated electron density is significantly elevated around the nanoparticles.When embedded in the four nanoparticles of Ag,Au,Cu,and Al,the absorption rate curve fluctuates in the range of 0.45~1.1m,and the absorption peaks in a wider range can be excited when the Al nanoparticles are embedded.Moreover,the overall distribution of the photogenerated electron density of the Si layer is best in the presence of Al nanoparticles.In the analysis of two Al nanoparticle spacings T of 0.1m,0.15m and 0.2m,the absorption rate was better when T was 0.1m in the range of 0.45~0.75m.When T=0.15m,a wider absorption peak is excited than the other two cases near the 0.9m and 1.0m,and the overall photogenerated electron density is higher in the upper region of the Si layer.

关 键 词：薄膜太阳能电池 金属纳米颗粒 LSPR 吸收率 FDTD 

分 类 号：TB3[一般工业技术—材料科学与工程]