An effective approach of vapour assisted morphological tailoring for reducing metal defect sites in lead-free, (CH3NH3)(3)Bi2I9 bismuth-based perovskite solar cells for improved performance and long-term stability - Jain, SM; Phuyal, D; Davies, ML; Li, M; Philippe, B; De, Castro C; Qiu, Z; Kim, J; Watson, T; Tsoi, WC; Karis, O; Rensmo, H; et al. (NANO ENERGY, 2018)