Hongwei Han is a Professor at Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology. He is the inventor of printable mesoscopic perovskite solar cells. Michael Grätzel is a Professor at Ecole Polytechnique Federale de Lausanne. He is a pioneer in the field of molecular photovoltaics and the development of perovskite solar cells. Anyi Mei, PhD, is a Professor at Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology. His research is focused on printed mesoscopic solar cell materials and devices. Yue Hu, PhD, is an Associate Professor at Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology. Her research interest is dye-sensitized solar cells and perovskite solar cells.