A 3‐Fluoro‐4‐hexylthiophene‐Based Wide Bandgap Donor Polymer for 10.9% Efficiency Eco‐Friendly Nonfullerene Organic Solar Cells. Issue 24 (14th June 2019) - Yu, Jeong Eun; Jeon, Sung Jae; Choi, Jun Young; Han, Yong Woon; Ko, Eui Jin; Moon, Doo Kyung