Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
Publication date: 18th December 2016
2D derivatives of hybrid halide perovskites are currently receiving increasing attention not only for their applications in photo-voltaics but also in other fields for their characteristic high photoluminescence and color tunability. The hydrophobic long chain cations act as an asset for their higher stability. The low dimensionality of the inorganic layer in 2D perovskites leads to quantum confinement effects and thus high exciton binding energy. Also, the low dielectric constant of organic cations leads to lower screening and thus lesser separation of charges. In this study we have tried to design new 2D perovskites by substituting the long organic cations with highly electron deficient cations targeting charge separation. We have performed DFT and TD-DFT calculations with lead-iodide inorganic layers coupled with electron-deficient naphthalene diimide dibutylammonium (NDI-dbu), and perylene diimide dibutylammonium (PDI-dbu)) cations. Subsequently the cations were substituted with electron donating and withdrawing groups. Through this study we demonstrate the effects of electron deficient linker groups in between the inorganic layers on the electronic structure of the 2D perovskites. Our study shows that the electron deficient organic cations have low-lying electronic levels and thus lead to small band gap. The pi-conjugated core of the organic molecules dominates the energy states of the conduction band whereas the covalently linked inorganic layer dominates the valence band. This has implications on the charge mobility of electrons and holes. The substitution of the electron donating groups at the bay area leads to an increase in the band gap of the material. With higher conjugation in the organic cation, the effective masses in the perovskite layer tend to decrease. We have also looked into the absorption properties of these materials and found increased absorption for higher conjugated organic cations.
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.
nanoGe Fall Meeting (NFM) is a multiple symposia conference celebrated yearly and 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.
This conference is a unique series of symposia focused on advanced materials preparation and fundamental properties and their applications, in fields such as renewable energy (photovoltaics, batteries), lighting, semiconductor quantum dots, 2-D materials synthesis and semiconductors fundamentals, bioimaging, 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.