Fabrication of Organic Solar Cells with Branched Cauliflower-Like Nano Structures as a Back Electrode Replicated from a Natural Template of Cicada Wing Patterns

Abstract

ABSTRACT-Nanostructures of noble metal materials have been used in organic solar cells for enhancement of performance and light trapping. In this study, we have introduced branched silver cauliflower-like nanopatterns as sub-wavelength structured metal grating in organic solar cells. Self-assembled fabrication process of branched nanopatterns was carried out on a bio-template of cicada wing nanonipple arrays using a gas aggregation dc magnetron sputtering nanocluster source without size filtration. The branched nanostructures provide surface gaps with dimensions near the organic exciton diffusion length, which prevents recombination of charge carriers. An increased power conversion efficiency of 14.8% compared to that of the planar device was achieved mainly due to the enhancement in the short-circuit current density. Besides, these branched cauliflower-like nanopatterns had enhanced optical light absorption in the solar cell as a result of enhancing the optical path length of the reflected light in the active layer and plasmonic effects of the noble metal material.

Cicada Wing-Inspired Transparent Polystyrene Film Integrating Self-Cleaning, Antifogging, and Antibacterial Properties

“…In recent years, biomimetic materials have gained significant attention due to their ability to provide unique structural and functional properties that are not easily replicated through conventional manufacturing processes. − The natural world provides a wealth of inspiration for such materials, and one promising source is the wings of cicadas. , Cicada wings possess a unique nanostructure that allows them to exhibit a range of remarkable properties, including antifouling, self-cleaning, antifogging, − optical trapping, , and antibacterial capabilities. − A transparent film inspired by cicada wings integrating antifouling, antifogging, and antibacterial properties can be useful in any setting where clear visibility and protection against germs and bacteria are necessary. − These features can help to ensure that the face shield, glass, optical lens, and food package remain clear and free from fogging − while also helping to prevent the spread of viruses, such as influenza and COVID-19. − …”

“…1−4 The natural world provides a wealth of inspiration for such materials, and one promising source is the wings of cicadas. 5,6 Cicada wings possess a unique nanostructure that allows them to exhibit a range of remarkable properties, including antifouling, 7 selfcleaning, 8 antifogging, 9−11 optical trapping, 12,13 and antibacterial capabilities. 14−19 A transparent film inspired by cicada wings integrating antifouling, antifogging, and antibacterial properties can be useful in any setting where clear visibility and protection against germs and bacteria are necessary.…”