Enhancement of charge transport in quantum dots solar cells by N-butylamine-assisted sulfur-crosslinking of PbS quantum dots

摘要: Abstract A novel and facile strategy to realize selective inorganic ligand (S2−) exchange on Pb-rich surface of PbS colloidal quantum dots (QDs) has been demonstrated. This was achieved via xanthate decomposition at room temperature without damaging the QDs surface. proposed method offers an amicable solution for limitation that inorganic-terminated are restricted by specific requirement solvents with high dielectric constant. Furthermore, Introduction S2− form sulfur-crosslinking enables reaction force-induced arrays smooth morphology spin-coated film as evidenced atomic force microscopy. Passivation bromide combined sulfur led stronger electronic coupling between adjacent compared bromide-only passivated counterparts. Bromide hybrid-capped exhibited remarkably enhanced carrier mobility from 1.66 × 10−4 cm2/V s 5.0 × 10−1 cm2/V s Hall- Effect measurement. The higher charge transport contributed boost in power conversion efficiency solar cells up 4.96% using only CTAB (3.04%). controlled sulfurization approach paves a potential way improved optoelectronic properties devices based QDs.