Air-stable and efficient inorganic–organic heterojunction solar cells using PbS colloidal quantum dots co-capped by 1-dodecanethiol and oleic acid

摘要

PbS colloidal quantum dot (CQD)-sensitized inorganic–organicheterojunction solar cells fabricated by using the PbS CQDsco-capped by the oleic acid (OA) and 1-dodecanethiol (DT)ligand showed better device stability with aging time underambient conditions without encapsulation. Furthermore, thedevice performance is better than the cell fabricated from PbSCQDs without DT ligand. The enhancement of performance inOA and DT co-capped systems is investigated by impedancespectroscopy. An upward displacement of the TiO2conductionband, with a consequent increase of Voc, results in the improvedperformance when CQD with DT are employed.