On the role of intermixed phases in organic photovoltaic blends - Westacott,P; Tumbleston,JR; Shoaee,S; Fearn,S; Bannock,JH; Gilchrist,JB; Heutz,S; DeMello,J; Heeney,M; Ade,H; Durrant,J; McPhail,DS; et al. (Energy & Environmental Science, 2013)