Halide perovskite/semiconductor quantum dots (QDs) have emerged as smart hybrid systems with a huge potential for light emission and energy conversion. However, the dynamics of generated e-h pairs are not fully understood. We used ultrafast UV-VIS transient absorption and THz spectroscopies to unravel the processes of the e-h recombination within a hybrid film of methylammonium lead triiodide (MAPbI3) interacting with different amounts of PbS/CdS core/shell QDs. The results obtained with samples having a high concentration of QDs indicate: (i) a large population (92%) of the photogenerated charge carriers are affected by QDs presence. (ii) The carriers not affected by QDs presence (8%) recombine through known perovskite deactivation channels. Lowering the QDs mass percentage to 0.24 causes a decrease in electron and hole effective transfer rate constants, and disappearance of excitons. In the talk, I will discuss the results, which provide clues to improve the performance of perovskite/QD based devices.

Decrypting of the ultrafast and fast deactivation processes in perovskite/QDs hybrid materials

256th National Meeting (2018)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.