Titre :‘‘Optoelectronic Materials and Devices for Energy Conversion’’

Endroit: Salle G-615, Pavillon Roger-Gaudry

Résumé:Transforming one form of energy into the other form by exploiting
fundamental properties of materials have always been attractive areas of
research. Among many materials, optoelectronic materials have gathered a
great deal of attention because they deploy photons to drive such energy
transformations. In this talk, I will discuss different strategies of energy
conversion using a variety of optoelectronic materials and devices.

First part of the talk will be focused on solar cells (light to electricity), where
I will discuss the diverse approaches of improving light harvesting in dye
sensitized solar cells (DSSCs), and perovskite solar cells. To harvest light in
the desired region, we employed plasmonic nano-antennas as light trapping
elements in DSSCs and achieved about ~30% enhancement in efficiency. In
perovskite solar cells, we investigated the optimum layer thickness and the
effect relative humidity on the perovskite crystal growth to achieve efficient
and hysteresis free solar cells.

Second part will be focused on light emitting diodes (LEDs) (electricity to
light), where I will discuss the impact of device structure on overcoming
some of the challenges in blue perovskite LEDs. I will also talk about the role
of a dopant ion e.g. Mn2+ on the optical properties of blue nanocrystals and
hence on the efficiency and stability of LEDs.