Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
Publication date: 20th April 2022
Spintronics is one of the most important emerging areas in digital technology to develop high-speed, low-power and high-density quantum devices.1 In spintronics, the spin degree of freedom of electrons is exploited explicitly, next to the charge. A key challenge for the field is the development of new semiconductor materials that absorb and emit circularly polarized light with a specific handedness (left-S or right-R) and generate electronic charges with a specific spin state (up or down spin-polarized currents) without requiring strong external magnetic fields.1
Chiral organic-inorganic perovskites are promising materials that are gaining attention in the field of spintronics as studies have reported considerable degrees of cicularly polarized (CP) photoluminescence without magnetic fields (~10% CP-PL) and spin-polarizations of ~86% by mc-AFM.2–4 These results overshadow tradional materials in the field of spintronics like inorganic semiconductors with large spin-orbit interactions (in which a 10% CP PL is achieved at magnetic fields B>5 tesla) and chiral organic chromophores (in which spin-polarizations of ~30% are measured by mc-AFM).2–4 Moreover, it is outstanding that chiral organic-inorganic perovskites exhibit preferential absorption of CP light depending on the handedness of the organic molecule in electronic transitions associated to the inorganic components.2–4 The mechanisms that explain these "chirality transfer" to the inorganic transitions are unknown.2–4
In this work, we aim to reveal the mechanisms that allow "chirality transfer" and exciton spin dynamics in chiral perovskites by a combination of in-depth structural characterization (spin-orbit coupling and chirality) and spectrocopy techniques such as circular dichroism and ultrafast CP transient-absorption (TA) spectroscopy. For this, we have synthesized a series of chiral hybrid perovskites using methylbenzylammine (MBA) and naphtylethylamine (NEA) as chiral chromophores, which crystalize in layered two-dimensional and one-dimensional (1D) structures. We report the spin-dynamics of the series of 2D materials, rac-, R- and S-MBA2PbI4 on picosecond time scale after excitation and probing with CP light.
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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.