Effect of energy transfer on the optical properties of surface-passivated perovskite films with CdSe/ZnS quantum dots.

ABSTRACT: Surface passivation is an effective method to protect the surfaces and improve the luminescence properties of perovskite (PS) films. CdSe/ZnS core-shell quantum dots (QDs) have been employed for surface passivation of PS films because of their size-dependent tunable bandgaps. Herein, the energy transfer (ET) behavior of CH₃NH₃PbI₂Br PS films covered with CdSe/ZnS QDs (QD/PS hybrid structures) is characterized by using photoluminescence (PL) and time-resolved PL spectroscopy. The PL decay time and the integrated PL intensity of the QD/PS hybrid structure increase compared with those of the bare PS films, owing to ET from the QDs to the PS and reduced charge traps. The ET efficiency increases from ~7% to 63% for the QD/PS hybrid structure when the core diamet

SUBMITTER: Cho IW 

PROVIDER: S-EPMC6895127 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature