期刊
ACS NANO
卷 9, 期 10, 页码 9603-9613出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b04091
关键词
light trapping; chalcopyrite solar cells; dielectric scattering patterns; substrate conformal imprint lithography; J(sc) enhancement
类别
资金
- Helmholtz-Association for Young Investigator groups within the Initiative and Networking fund [VH-NG-928]
- NWO
- European Research Council
- Global Climate and Energy Project (GCEP)
- NanoNextNL, a technology program of the Dutch Ministry of Economy Affairs
- China Scholarship Council
We experimentally demonstrate photocurrent enhancement in ultrathin Cu(In,Ga)Se-2 (COO solar cells with absorber layers of 460 nm by nanoscale dielectric light scattering patterns printed by substrate conformal imprint lithography. We show that patterning the front side of the device with TiO2 nanoparticle arrays results in a small photocurrent enhancement in almost the entire 400-1200 nm spectral range due to enhanced light coupling into the cell. Three-dimensional finite-difference time-domain simulations are in good agreement with external quantum efficiency measurements. Patterning the Mo/CIGSe back interface using SiO2 nanoparticles leads to strongly enhanced light trapping, increasing the efficiency from 11.1% for a flat to 12.3% for a patterned cell. Simulations show that optimizing the array geometry could further improve light trapping. Including nanoparticles at the Mo/CIGSe interface leads to substantially reduced parasitic absorption in the Mo back contact. Parasitic absorption in the back contact can be further reduced by fabricating CIGSe cells on top of a SiO2-patterned In2O3:Sn (ITO) back contact. Simulations show that these semitransparent cells have similar spectrally averaged reflection and absorption in the CIGSe active layer as a Mo-based patterned cell, demonstrating that the absorption losses in the Mo can be partially turned into transmission through the semitransparent geometry.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据