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LL4.04 - Flexible Transparent Organic/Ag/Metal Oxide Electrode for Organic Solar Cells 
April 22, 2014   4:30pm - 4:45pm

Flexible organic solar cells have been promising as next generation renewable energy because of ease of processing, light-weight portability and a competitive price. Although their potentials were investigated over the past decade, sufficient power generation has not yet been realized to the industry fields due to the natural phenomenon, varying the angle of incidence depending on the sun’s coming up over a full day. Therefore, the light harvesting at a wide range of incident angles is a key issue for solar cells. Several approaches, multilayer antireflection coatings or surface texturing structures have been previously used to reduce the surface reflection and enhance the absorption efficiency. However, thermal mismatch, instability of the thin film stacks and complicated fabrication process still remain major obstacles in developing the angle-independent solar cells with broadband wavelength. Hereby, we present a novel way of preparing an omnidirectional electrodes with excellent transparency. Ormoclear/Ag/WO3 (OoMDi) was designed not only for an alternative to ITO but also for an omnidirectional layer independent of incident angle of lights. Employing the ormoclear with low refractive index (n = 1.45) as an outer organic (Oo) layer, insensitivity to the angles of incidence (0 ~ 90o) was acheived in the OoMDi structures. Moreover, oxygen plasma treatment on Ormoclear prior to deposition of 10-nm-thick Ag, surface plasmon coupling at the Ormoclear/Ag interface could be greatly suppressed. As a result, an optimized structure of Ormoclear/Ag/WO3 shows an high optical transmission of > 91%, low sheet resistance of ~5.2 ohm sq-1. Employing the OoMDi electrode as an anode to the PTB7:PCBM organic solar cell resulted in the significantly improvement in the power conversion efficiency up to 10 %, from 7.1% using ITO anode to 7.7% .

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Keynote Address
Panel Discussion - Different Approaches to Commercializing Materials Research
Business Challenges to Starting a Materials-Based Company
Fred Kavli Distinguished Lectureship in Nanoscience
Application of In-situ X-ray Absorption, Emission and Powder Diffraction Studies in Nanomaterials Research - From the Design of an In-situ Experiment to Data Analysis