Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.214
Publication date: 30th March 2023
Most technologically-relevant lead halide perovskites are direct-bandgap semiconductors (acknowledging there is some debate on this matter) but are often not as emissive as one should expect. This impacts the application of lead halide perovskites in light emitting diodes and also gives rise to non-radiative voltage loss in solar cells. That said, a small number of very specific compositions have exhibited highly efficient photo-and-electro-luminescence and thus are used in LEDs and solar cells with large open circuit voltages.
It is now believed and partially evidenced that the non-radiative recombination in perovskites is mainly associated with Shockley-Read-Hall (SRH) recombination. In this talk I will show that the inverse of this process occurs in both perovskite and organic semiconductors too, that is, the mid-gap trap states – responsible for SRH recombination – are partially radiative and their signature can show up in the external quantum efficiency spectrum, if measured sensitively enough. This trap-induced signature can be used as an indicator for probing the extent of non-radiative loss caused by mid-gap traps. We show that these traps are mainly at the interface between the perovskite and fullerene layer, while in organic semiconductors are present in the bulk of the material. Implications of these mid-gap traps on photodetector and solar cells operation will be discussed.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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.