New generation hole transporting materials for perovskite solar cells: amide-based small-molecules with nonconjugated backbones

摘要: State-of-the-art perovskite-based solar cells employ expensive, organic hole transporting materials (HTMs) such as Spiro-OMeTAD that, in turn, limits the commercialization of this promising technology. Herein an HTM (EDOT-Amide-TPA) is reported which a functional amide-based backbone introduced, allows material to be synthesized simple condensation reaction with estimated cost <$5 g(-1). When employed perovskite cells, EDOT-Amide-TPA demonstrates stabilized power conversion efficiencies up 20.0% and reproducibly outperforms direct comparisons. Time resolved microwave conductivity measurements indicate that observed improvement originates from faster injection rate EDOT-Amide-TPA. Additionally, devices exhibit improved lifetime, assigned coordination amide bond Li-additive, offering novel strategy hamper migration additives. It shown despite lack conjugated backbone, can outperform state-of-the-art HTMs at fraction cost, thereby providing set design strategies develop new, low-cost HTMs.