In-situ, long-term operational stability of organic photovoltaics for off-grid applications in Africa - Emmott,CJM; Moia,D; Sandwell,P; Ekins-Daukes,N; Hosel,M; Lukoschek,L; Amarasinghe,C; Krebs,FC; Nelson,J (Solar Energy Materials and Solar Cells, 2016)