Semiconducting quantum dots with optoelectronic and photonic functions (Conference Presentation)

Abstract

Semiconducting quantum dots (QDs) have unique optical properties such as high quantum yields and broad emission spectral wavelengths that are tunable by the quantum confinement effect. Considerable effort directed at modifying the surface of QDs using capping agents have led to a simple solution-based process, the stabilization of QDs, and their uniform dispersion in solvent. Due to these unique properties, quantum dots are of increasing importance in the fundamental studies and in a wide range of technological applications such as optical power limiters, light emitting devices, photovoltaics, lasers, and fluorescent labels for bioimaging. Tacking the full potential of QDs in optoelectronic devices require efficient mechanisms for transfer of energy or electrons produced in the optically excited QDs. We have investigated various organic-inorganic hybrids based on QD-decorated and QD-coupled systems on semiconducting substrates or molecules to achieve energy or charge transfer. The hybridization of p-type π-conjugated molecules to the surface of n-type QDs can induce distinct luminescence and charge transport characteristics due to energy and/or charge transfer effects. These kinds of energy/charge transporting properties are also observable in the perovskite QDs. The novel properties of hybrids consisting of QDs decorated or attached to conducting materials could find applications in molecular electronics and optoelectronics, including luminescent displays and energy harvesting cells.