Abstract
Binary thin film exhibits not only the quantum features of the individual building blocks but also novel collective properties through coupling of colloidal quantum dot components. In this paper, lead sulfide (PbS) and cadmium sulfide (CdS) colloidal quantum dots (CQDs) were synthesized by using oleate and oleylamine as ligand. The as-synthesized PbS and CdS CQDs were monodispersity and well passivation. The average diameter of as-synthesized PbS and CdS CQDs were about 3 nm and 6 nm, respectively. By blending PbS with CdS CQDs and utilizing ethanedithiol for ligand passivation, the responsivity and detectivity of PbS CQDs thin film was enhanced with the weight ratio of CdS CQDs increased, the optimum responsivity and detectivity were 21.9 mA/W and 2.1 × 1010 Jones, respectively. The desirable properties of binary colloidal quantum dot thin films have important applications in future electronic and optoelectronic devices.
Published Version
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