Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Information storage in flexible electronics remains a technological challenge. Organic memory devices yet promise re-writability, non-volatility, non-destructive electrical readout and scalability. Here, we demonstrate hysteretic resistive switching in a simple organic memory diode utilizing a multifunctional – semiconducting and dipolar – single organic molecule, a-CBT. In thin films a-CBT organizes into a hexagonal columnar packing, facilitating both effective charge transport and collective dipolar behavior.
It was found by depth-resolved pyroelectric response measurements (LIMM) that the bulk of the material remains unpoled: the conductivity switching is caused only by the field-driven dipole re-orientation in the interfacial areas near the metal electrodes, from where significant LIMM signal was observed. The presence of an interfacial polarization field leads to a modulation of the barrier for charge injection into the semiconductor by around 0.5 eV. Consequently, for devices with electrodes chosen wisely the current jumps from a low, injection-limited, off-state to a high, space charge-limited, on-state after passing the coercive field of approximately 13 V/µm. The resulting memory diodes show switchable rectification with high on/off ratios of up to two orders of magnitude, which is desirable for application in crossbar arrays.
Combining dipolar and semiconducting properties into a single compound solves many of the problems associated with previously explored memory elements based on phase separated blends of ferroelectric and semiconducting materials. The demonstrated multi-functionality of a single material is a promising concept towards possible application in low-cost, large-area, non-volatile organic memories. However, the current need for elevated operation temperatures and the associated short retention times will require further attention. The good processability and tunability by chemical design of organic semiconductors will therefore be a major asset.
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.