Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 3: Organic Electronics and Photovoltaics I (DS jointly with HL, O)

O 3.7: Talk

Monday, March 31, 2014, 11:30–11:45, ZEU 222

Structured growth of ZnO for light trapping enhancement in organic solar cells — •Nivedita Yumnam and Veit Wagner — Jacobs University, 28759 Bremen, Germany

Organic photovoltaic cells are promising candidates for large-area and low-cost production of solar cells. However, their performance is limited due to the short diffusion length of excitons and low absorption in the active semiconductor layer. The absorption of light can be enhanced by incorporating ZnO nanostructures, which act as scattering centres and hence, they increase the optical path length of light. Our work focuses on the investigation of light trapping mechanism of solar cells based on electrochemically grown ZnO nanorod and active layer of conjugated polymer P3HT and PCBM. The size and the structure of the ZnO nanorods are varied by changing the parameters of electrochemical deposition. Angle resolved scattering measurements are employed to investigate the amount of light scattered by the nanorods. These results are correlated to the performance of the solar cell determined from electrical measurements.