Charge separation and ultraviolet photovoltaic conversion of ZnO quantum dots conjugated with graphene nanoshells

1 Interface Control Research Center, Future Convergence Research Division, Korea Institute of Science and Technology, Hwarangno 14 gil 5, Seoul, 136-791 Korea 2 Green Ceramics Division, Korea Institute of Ceramic Engineering and Technology, 7710-gil, Digital-ro, Geumcheon-gu, Seoul, 153-801 Korea 3 Department of Physics, Yonsei University, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 120-749 Korea 4 Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, 1 Oryong-dong Buk-gu, Gwangju, 500-712 Korea