Publication date: 9th January 2023
Solution-based memristors have solid technological potential based on their scalability, low cost, and environmentally friendlier processing. Inkjet printing is a digital technique that allows low-cost deposition of patterned thin films with a controlled thickness, which is a key factor for memristors development for highly uniform devices with low performance variations.
Indium gallium zinc oxide (IGZO), an oxide semiconductor material, shows promising resistive switching properties in its optimized stoichiometry. An IGZO layer with a stoichiometry of 1:3:1 will optimize the generation of oxygen vacancies, responsible for carrier transportation.
In this work, a printed Indium tin oxide (ITO)/IGZO (1:3:1)/Silver (Ag) memristor has been fabricated showing both counter8wise (c8w) and 8wise (8w) switching at low operating voltage. The c8w switching is characterized by non-volatile characteristics with a SET and RESET voltage of 1 V and -0.75 V, respectively, and a retention up to 105 s, whereas the 8w switching shows volatile characteristics with a low threshold voltage (Vth < -0.65V). The current retention decay was further characterized by fitting an exponential function with a characteristic time (τ) of 3.38 ms. These volatile characteristics allowed them to be tested on different 2-bit pulse sequences, confirming the strong potential for temporal signal processing in the scope of reservoir computing.
Those combined characteristics allows to work well on printed metal oxide memristors using low-cost and sustainable materials by designing a fully memristive architecture solely based on IGZO, where the reservoir state (volatile mode) can be processed with the IGZO memristive readout neural network (non-volatile mode).
This research was funded by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT—Portuguese Foundation for Science and Technology—under the scope of the project No. UIDB/50025/2020-2023. The authors thank the Fundação para a Ciência e Tecnologia (FCT) for financial support under the framework of Strategic Funding grants UID/FIS/04650/2020 and grant SFRH/BD/145741/2019. Financial support from the Basque Government Industry Department under the ELKARTEK program is acknowledged.
E. Carlos and A. Kiazadeh acknowledge the Individual Call to Scientific Employment Stimulus - 4th Edition (2021. 03825.CEECIND), (2021. 03386.CEECIND) through FCT. A. Kiazadeh and E. Carlos acknowledge FCT/MCTES, project NeurOxide (PTDC/NAN-MAT/30812/2017), 101097101 (Terrameta) and project Supreme-IT (EXPL/CTM-REF/0978/2021).
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.