Organic solar cells and methods of making the same
摘要
說明書
One of the main culprits in the environmental degradation of organic solar cells is the photochemical instability of fullerene derivatives which are widely used as electron acceptors in the donor:acceptor blend photoactive layers (Lee, et al., Adv. Energy Mater. 2016, 6 (21), 1600970; Hansson, et al., Phys. Chem. Chem. Phys. 2016, 18, 11132-11138; et al., Brumboiu, et al., J. Chem. Phys. 2015, 142, 054306). Anselmo et al found that drastic changes at the surface of fullerene film happen when the film is exposed to ambient air with the presence of light, which could cause serious issues on solar cell performance (Anselmo, et al., Chem. Phys. Lett. 2016, 652, 220-224). Recently, Lee et al identified the effects of photo-oxidation of fullerene derivative on its chemical structure, and connected the result to specific changes in its electronic structure, which consequently influence the electron transport and recombination kinetics of the solar cells (Lee, et al., Energy Environ. Sci. 2018, 11, 417-428). Bao et al also noticed that when fullerene molecule is exposed to water under light irradiation, its electronic structure is irreversibly changed (Bao, et al., Adv. Energy Mater. 2014, 4 (6), 1301272).
