Sokol, AA; Farrow, MR; Buckeridge, J; Logsdail, AJ; Catlow, CR; Scanlon, DO; Woodley, SM; (2014) Double bubbles: a new structural motif for enhanced electron-hole separation in solids. Physical Chemistry Chemical Physics , 16 (39) pp. 21098-21105. 10.1039/c4cp01900h. Green open access