Optimization of Dielectric-Coated Silver Nanoparticle Films for Plasmonic-Enhanced Light Trapping in Thin Film Silicon Solar Cells

被引:17
|
作者
Rao, Jing [1 ]
Varlamov, Sergey [1 ]
Park, Jongsung [1 ]
Dligatch, Svetlana [2 ]
Chtanov, Anatoli [2 ]
机构
[1] Univ New S Wales, Sch Photovolta, Sydney, NSW 2052, Australia
[2] Commonwealth Sci & Ind Res Org Mat Sci & Engn, Sydney, NSW 2070, Australia
关键词
Surface plasmons; Silver nanoparticles; Light trapping; Silicon thin film solar cell; SIZE;
D O I
10.1007/s11468-012-9473-y
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Surface plasmonic-enhanced light trapping from metal nanoparticles is a promising way of increasing the light absorption in the active silicon layer and, therefore, the photocurrent of the silicon solar cells. In this paper, we applied silver nanoparticles on the rear side of polycrystalline silicon thin film solar cell and systematically studied the dielectric environment effect on the absorption and short-circuit current density (Jsc) of the device. Three different dielectric layers, magnesium fluoride (MgF2, n=1.4), tantalum pentoxide (Ta2O5, n=2.2), and titanium dioxide (TiO2, n=2.6), were investigated. Experimentally, we found that higher refractive index dielectric coatings results in a red-shift of the main plasmonic extinction peak and higher modes were excited within the spectral region that is of interest in our thin film solar cell application. The optical characterization shows that nanoparticles coated with highest refractive index dielectric TiO2 provides highest absorption enhancement 75.6 %; however, from the external quantum efficiency characterization, highest short-circuit current density Jsc enhancement of 45.8 % was achieved by coating the nanoparticles with lower refractive index MgF2. We also further optimize the thickness of MgF2 and a final 50.2 % Jsc enhancement was achieved with a 210-nm MgF2 coating and a back reflector.
引用
收藏
页码:785 / 791
页数:7
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