| 초록 |
The brilliant color reflected from nature stems from a photonic crystal morphology. There are many examples in biology of the manipulation of sunlight by nanoscale features including such diverse applications as temperature control, mate attraction, antireflection, and the efficient collection of low light levels. In particular, the striking “structural black”-an absence of reflected visible light-of butterfly scales suggests that biomimicry might be a viable route to enhanced optolectronic devices. Here we describe a materials-agnostic, 2-D, photonic crystal morphology that enhances the efficiency of optoelectronic devices. The morphology is developed by patterning the organic photoactive material via fluorine chemistry, a method that lends itself to large area fabrication of photonic crystal nanostructures. The photonic crystal cell morphology increases photocurrents generally, and particularly through the excitation of resonant modes near the band edge of the organic photovoltaic material. The device performance of the photonic crystal cell showed a nearly doubled increase in efficiency relative to conventional planar cell designs. Photonic crystals can also enhance performance of other optoelectronic devices including organic laser |
