Nano Research May 2014, Volume 7, Issue 5, pp 670-678
Hyo Jin Gwon(1)(2); Yensil Park(3); Cheon Woo Moon(4); Sahn Nahm(2); Seok-Jin Yoon(1); Soo Young Kim; Ho Won Jang(4)
1. Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul, 136-791, Korea
2. Department of Materials Science and Engineering, Korea University, Seoul, 136-701, Korea
3. School of Chemical Engineering and Materials Science, Chung-Ang University, Seoul, 156-756, Korea
4. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 151-744, Korea
We present a facile method for producing superhydrophobic nanograss-coated (SNGC) glass surfaces that possess both reduced reflectivity and self-cleaning properties at the air/glass interface. The refractive index of a CaF2 nanograss (NG) layer on a glass substrate, deposited by glancing angle vapor deposition, is 1.04 at 500 nm, which is the second-lowest value ever reported so far. The fluorinated NG layer gives rise to a high water contact angle (>150°) and very efficient cleaning out of dust with water drops. Using the dual functionalities of the SNGC glass, we demonstrate superhydrophobic and antireflective organic photovoltaic cells with excellent power conversion efficiency.