Date
Place
- Room H (Room Hall 1, 1F)
- P2. Poster Session II
- August 21, 2015 (Friday)
- 14:00 ~ 15:30
- [P2-166]
- 14:00 ~ 15:30
- Title:High Mobility Electron Transporting Layer with Vertical ZnO Nanorod Array for the Organic Photovoltaic Devices
- Kunsik An, Jaehoon Kim, Jiyun Song, Myeongjin Park, Hyunho Lee, Seunghyun Rhee, Jaeyeol Kim, and Changhee Lee (Seoul Nat'l Univ., Korea)
Abstract: For more than 20 years, solution-processed organic and hybrid organic?inorganic photovoltaics have been under extensive research. All the process of stacking each layers are carried out using low-temperature solution-based coating so that it can be applied at low cost using high throughput roll-to-roll processing on the plastic substrate. In order to increase light absorbance of the solar cell, thick layer of heterojunction active material is necessary. However, thick active layer lower the power conversion efficiency (PCE) by light and photon blocking problems despite of high absorbance. One of the complementary measures can be an ultra-fast charge transfer layer with metal oxide semiconductor such as SnO2, TiO2, and ZnO. It goes on inorganic semiconductor embedded in a conjugated polymer structure using nanostructured metal oxide. Here, we report vertically grown ZnO nanorod array which can be applied on the electron transporting layer of photovoltaics. Diameter of each nanowire is controlled by reaction time from the seed layer to 3¥ìm. Through the structure, it enhances electron mobility as well as extraction properties over the device, resulting in the improvement of short circuit current in organic photovoltaic devices. There is highway effect of the generated excitons that the charge carriers are easily evacuated from the active layer.
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