| 초록 |
Moth-eye-inspired structures were fabricated on the outer surface of the photoanode of DSSCs using a facile SNIL process. Commercially available perfluoropolyether (PFPE) and NOA63 as the mold resin and second replica mold material, respectively, play an important role in fabricating the structure. Polyurethane-based NOA63 was shown to create a well-ordered moth-eye structure that exhibits increased transmittance(82% at 540nm), which was consistent with the IPCE data(81% at 540nm). As a result, ssDSSCs with the moth-eye structure showed enhancements of 10.7%(Jsc) and 9.8%(η) to reach 7.3% efficiency at 100 mW cm−2, one of the highest values observed for N719 dye based ssDSSCs. Furthermore, they showed excellent superhydrophobicity of about 150°, even without the aid of a fluorinated self-assembled monolayer(SAM) coating. This nature-inspired nanopatterning process could be used for improving light harvesting in any type of photovoltaic cell, and it produces superhydrophobic surfaces, which in turn lead to self-cleaning for long-term stability. |
