Efficiency enhancement in Cu2ZnSnS4 solar cells with silica nanoparticles embedded in absorber layer

Balakrishna Ananthoju, Sundara Murthy Mopurisetty, H. Tyagi, D. Bahadur, N. Medhekar, S. Ganguly, M. Aslam
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Abstract

Light trapping is essential to lower transmission losses in thin-film solar cells, particularly for wavelengths where the absorption is inefficient. We have embedded silica nanoparticles into a CZTS absorber layer resulting in localized as well as scattering field enhancement. UV-Vis absorption measurements show position (depth in the absorber layer) dependent improvement in the optical absorption with incorporation of silica nanoparticles; this has been explained using finite-difference-time-domain (FDTD) calculations of Mie scattering. The optical enhancement in turn leads to efficiency improvement as seen from electrical measurements; this has a slightly different position dependence that can also be understood theoretically. We observe maximal efficiency improvement, of about 21% compared to devices without nanoparticles (reference cell efficiency ~ 4.13% and for particles at middle ~ 5%), when nanoparticles are placed at the middle of the absorber layer.
吸收层中嵌入纳米二氧化硅提高Cu2ZnSnS4太阳能电池效率
光捕获对于降低薄膜太阳能电池的传输损失至关重要,特别是对于吸收效率低的波长。我们将二氧化硅纳米颗粒嵌入到CZTS吸收层中,从而增强了局部和散射场。紫外-可见吸收测量表明,二氧化硅纳米颗粒的掺入对光学吸收的改善取决于吸收层的位置(深度);这已经用米氏散射的时域有限差分(FDTD)计算得到了解释。从电测量来看,光学增强反过来又导致效率提高;这有一个稍微不同的位置依赖,也可以从理论上理解。我们观察到,当纳米颗粒放置在吸收层的中间时,与没有纳米颗粒的器件相比,效率提高了21%左右(参考电池效率约为4.13%,中间颗粒约为5%)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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