Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Publication date: 11th December 2017
Energy conversion processes in semiconductor nanocrystals typically occur with non-unity yields. Much of the losses involve the generation of heat, for example via electronic relaxation after photoexcitation. Surprisingly, a central question remains unanswered: how can we dispose of (or maintain) this heat? The present lack of an answer to this question hinders the development of more efficient and stable optoelectronic (or thermoelectric) devices.
In this talk, I will discuss the possibility and implications of heat dissipation from a nanocrystal core to its environment, i.e. ligands and surrounding matrix (e.g. solvent molecules). I address the current challenge of correlating electronic and nuclear excitations by probing them simultaneously, using a combination of transient absorption and femtosecond stimulated Raman spectroscopy, respectively. This enables us to monitor both electronic the thermal processes in real-time, in a single experiment. Such an approach, while currently pioneering the fields of optogenetics and protein folding, has not yet been applied to the field of semiconductor nanocrystals.
Specifically, I will report on (sub-)picosecond thermal processes in CsPbBr3 nanocrystals and compare them to more traditional systems such as prototypical CdSe and PbS nanocrystals. These systems differ in a wide range of heat-related processes, from charge-carrier cooling rates to melting points of the crystalline core. In this talk, I will stimulate a critical discussion on how chemical insight can help understand photophysical processes, and vice versa. As such, we take the first steps towards a better control of heat dissipation in devices such as LEDs, solar cells, or thermoelectrics.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.