1. Max
Planck Research Group for
Organic Optoelectronics, Max Planck Institute for Polymer Research, D-55128 Mainz, Germany
2. School of Electrical and Computer
Engineering, Interuniversity Semiconductor Research Center and Center
for Multiscale Energy System, Seoul National University, Seoul 151-744, South Korea
3. Department of Chemistry, Seoul National University, Seoul 151-747, Korea