Wavelength-Scale Structures as Extremely High Haze Films for Efficient Polymer Solar Cells
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- 作者：Juyoung Ham ; Wan Jae Dong ; Gwan Ho Jung ; Jong-Lam Lee
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2016
- 出版时间：March 9, 2016
- 年：2016
- 卷：8
- 期：9
- 页码：5990-5997
- 全文大小：628K
- ISSN：1944-8252
文摘
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/cm2), 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/cm2. 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.