Organolead halide peroskite quantum dots (PQDs) possess unique optical and electronic properties that are potentially useful for solar energy conversion and other potential application. They are particularly attractive for device fabrication in large area and on flexible substrates, like plastics, with low cost processing such as screen printing. One major issue with PQDs, and perovskite in general, is instability that is possibly related with bandgap trap states due to surface defects. We have synthesized CH3NH3PbXnY3-n PQDs with tunable emission wavelength from green to red by controlling their size and compositions (X and Y=Cl, Br, I; n=0, 1, 2). Furthermore, we developed and evaluated several strategies to passivate surface states with the goal to enhance the stability of the PQDs. The structural and optical properties of the PQDs have been characterized using a combination of spectroscopy and microscopy techniques. In addition, exciton dynamics of the PQDs have been investigated using ultrafast laser techniques. The results indicate the surface passivation is a promising method to address the issue of instability, which has important implications in solar energy conversion applications.

Optical properties and exciton dynamics of organolead halide peroskite quantum dots for solar energy conversion

249th National Meeting (2015)

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