Ham Juyoung, Dong Wan Jae, Jung Gwan Ho, Lee Jong-Lam
Department of Materials Science and Engineering, Division of Advanced Materials Science Pohang University of Science and Technology (POSTECH) , Pohang 790-784, Korea.
ACS Appl Mater Interfaces. 2016 Mar 9;8(9):5990-7. doi: 10.1021/acsami.5b11061. Epub 2016 Mar 1.
Wavelength-scale inverted pyramid structures with low reflectance and excellent haze have been designed for application to polymer solar cells (PSCs). The wavelength-scale structured haze films are fabricated on the back surface of glass without damages to organic active layer by using a soft lithographic technique with etched GaN molds. With a rigorous coupled-wave analysis of optical modeling, we find the shift of resonance peaks with the increase of pattern's diameter. Wavelength-scale structures could provide the number of resonances at the long wavelength spectrum (λ = 650-800 nm), yielding enhancement of power conversion efficiency (PCE) in the PSCs. Compared with a flat device (PCE = 7.12%, Jsc = 15.6 mA/cm(2)), improved PCE of 8.41% is achieved in a haze film, which is mainly due to the increased short circuit current density (Jsc) of 17.5 mA/cm(2). Hence, it opens up exciting opportunities for a variety of PSCs with wavelength-scale structures to further improve performance, simplify complicated process, and reduce costs.
具有低反射率和优异雾度的波长尺度倒金字塔结构已被设计用于聚合物太阳能电池（PSC）。通过使用带有蚀刻氮化镓模具的软光刻技术，在玻璃背面制备波长尺度结构化雾度膜，且不会对有机活性层造成损害。通过严格耦合波光学建模分析，我们发现共振峰随图案直径的增加而移动。波长尺度结构可以在长波长光谱（λ = 650 - 800 nm）处提供多个共振，从而提高PSC的功率转换效率（PCE）。与平面器件（PCE = 7.12%，Jsc = 15.6 mA/cm²）相比，雾度膜的PCE提高到了8.41%，这主要是由于短路电流密度（Jsc）增加到了17.5 mA/cm²。因此，它为各种具有波长尺度结构的PSC进一步提高性能、简化复杂工艺和降低成本开辟了令人兴奋的机会。
