HiTHIUM Energy Storage’s Post

New paper about reverse bias stability of perovskite/silicon tandems with Barry Rand and colleagues at Princeton University, just published in Joule. Reverse biasing is a situation that may happen when unintentionally shading any PV module, for instance due to a leaf. The strong resilience we find for monolithic perovskite/silicon tandems, thanks to the silicon bottom cell which protects the perovskite top cell, gives this technology a further boost as the frontrunner towards practical applications of perovskite PV.

Congratulations on this study comparing the reverse-bias stability of perovskite single-junction, silicon single-junction, and monolithic perovskite/silicon #tandem solar cells. Perovskites enable high-efficiency photovoltaics but degrade under reverse bias, problematic for module integration where shading can induce reverse bias. The team from 美國普林斯頓大學 and KAUST (King Abdullah University of Science and Technology) shows monolithic perovskite/silicon tandems exhibit superior reverse-bias resilience versus perovskite single-junctions in biasing tests and shading tests. The silicon subcell drops over 95% of the reverse voltage due to its low reverse current, protecting the perovskite subcell from degradation. In summary, the silicon subcell in monolithic perovskite/silicon tandems provides highly effective reverse-bias protection for the perovskite subcell, enabling greatly improved stability against shading compared to #perovskite single-junction solar cells. This highlights a crucial advantage of perovskite/silicon tandems for commercialization.

Shaded cells of a PV module operate in reverse bias. This damages the cells. I thought perovskite had no chance against it. At large reverse bias, the cell reaches the breakdown voltage. The device becomes conductive. But in the opposite polarity than the normal operating conditions. Surpassing the breakdown voltage damages the device. Perovskites have a small breakdown voltage. Just a few volts. Silicon solar cells have a very large breakdown voltage. Up to -20V. They are more resilient against the reverse bias caused by shading. Connect perovskite and silicon devices in series - 2-terminal tandem configuration - and the silicon subcell protects the perovskite solar cell against reverse bias. The Si solar cell will undergo most of the reverse bias. How so? At large reverse bias, perovskite is more conductive - it has lower resistance - than silicon, due to the small breakdown voltage. A device with low resistance will have a small voltage drop. That's Ohm's law. It is challenging to measure the voltage applied on the single subcells. Electrical simulations support the experimental observation. Very nice study! #perovskite #stability #reversebias

You are interested in perovskite PV and want to learn about more sustainable and lead-free perovskites? Then read our recent article and start exploring the htspero- #database! #perovskitePV #database #fraunhofer

The Fraunhofer Institute for Mechanics of Materials IWM and Fraunhofer IWKS are pleased to introduce www.htsperodb.de, a #database that collects insight from electronic-structure calculations on perovskite halide absorber materials to facilitate the development of next generation #solar cells!   The database adheres to the FAIR (findable, accessible, interoperable, reproducible) principles for scientific data and tackles three major problems when identifying ideal absorber materials depending on envisioned device architectures:   1) homogenizing the available heterogeneous electronic-structure data 2) filtering for appropriate materials with respect to physical properties 3) assessing the health and resource criticality of envisioned compounds. Feel free to read our #article for more information on the database: https://s.fhg.de/QS8h

We are thrilled to announce the launch of our groundbreaking campaign dedicated to revolutionizing Lithium-ion Battery Testing. Understanding and enhancing the performance of these batteries is a complex process that requires a deep dive into their design, chemistry, and performance characteristics. That's why our campaign is here to provide valuable insights into key areas of research and development. From slurry analysis to electrode sheet analysis and even the correlation between the two, we've got you covered. But it doesn't end there! Prepare to be amazed as we dive into battery characterization and explore the cutting-edge Hioki applications that make it all possible. With meticulous tailoring, we're pushing the boundaries of what these batteries can achieve. So, if you're ready to unlock the true potential of Lithium-ion batteries and stay ahead in the game, join us on this exciting journey. Follow us to stay updated on all the latest breakthroughs and participate in this battery testing revolution. Together, let's power the future! 💡Discover the LIB R&D Testing page ➡️https://lnkd.in/gRvcAQfv #BatteryTesting #LithiumIon #PowerTheFuture #BatteryResearch #BatteryDevelopment #BatteryPerformance

We are thrilled to announce the launch of our groundbreaking campaign dedicated to revolutionizing Lithium-ion Battery Testing. Understanding and enhancing the performance of these batteries is a complex process that requires a deep dive into their design, chemistry, and performance characteristics. That's why our campaign is here to provide valuable insights into key areas of research and development. From slurry analysis to electrode sheet analysis and even the correlation between the two, we've got you covered. But it doesn't end there! Prepare to be amazed as we dive into battery characterization and explore the cutting-edge Hioki applications that make it all possible. With meticulous tailoring, we're pushing the boundaries of what these batteries can achieve. So, if you're ready to unlock the true potential of Lithium-ion batteries and stay ahead in the game, join us on this exciting journey. Follow us to stay updated on all the latest breakthroughs and participate in this battery testing revolution. Together, let's power the future! 💡Discover the LIB R&D Testing page ➡️https://lnkd.in/gRvcAQfv #BatteryTesting #LithiumIon #PowerTheFuture #BatteryResearch #BatteryDevelopment #BatteryPerformance

A recent interview of our co-founder / CTO Vladimir Odnoblyudov by Taha Ayari, PhD of Yole Group: A deeper insight into Qromis, Inc.'s disruptive #engineeredsubstrate technology #QST (similar to #SOI substrates with respect to manufacturing and cost), designed for unlocking the full potential of #GaN #power from 100 V to 2000 V and beyond, and enabling bigger GaN power market than the earlier projections. Key features of GaN-on-QST platform, as covered in the interview and published in the most recent newsletter of Yole Group, enable: - scalable and high-volume manufacturing in mainstream 200 mm and 300 mm #CMOS #semiconductor fabs with highly competitive cost (<5 mm edge exclusion, >90% device and backend yield) - sustainable GaN power device manufacturing business; full spectrum of products - lateral and vertical power #switches extending from 100 V to 2000 V and beyond, wafer-level monolithic ICs and #rectifiers - sustainable QST substrate manufacturing and reduced carbon footprint; substrate assembly utilizing energy efficient mainstream semiconductor process tools in CMOS fabs with >98% yield and less than 7 days of process cycle time - #SEMI-spec thickness and compatible with mainstream CMOS fabs; no dedicated manufacturing line requirement - no GaN #epitaxy cracking or wafer breakage, very high mechanical strength, significantly reduced epitaxy cost, - high device reliability and ruggedness by extensive epitaxy budget - interchangeable GaN growth-ready surface from the existing Si (111) to single crystal #GaN, #SiC, or other GaN growth-ready surfaces for business expansion …and more. Commercial QST substrates and GaN-on-QST epitaxy wafers, from sampling size to large volumes, are available from Qromis, Inc. Inquiries: info@qromis.com #galliumnitride #widebandgap

Just published in "ACS Applied Energy Materials" journal our latest study: https://lnkd.in/ddpaZuit The efficient conversion of both light and heat deriving from the absorption of concentrated sunlight into electricity is a recently introduced objective within the #solar #energy field. Photon-enhanced thermionic energy converters (PETECs) accomplish this aim by combining both #photovoltaic and thermionic mechanisms to maximize the energy available for the power conversion, thus overcoming the respective limitations of both types of technologies (i.e., Schockley−Queisser and Carnot limit, respectively). In a PETEC, a #semiconductor cathode is illuminated with concentrated #sunlight generating photoexcited electrons in the conduction band, which thermalize and are subsequently thermionically emitted from its surface. PETECs can achieve higher conversion efficiencies than traditional photovoltaic solar cells through the exploitation of the thermalization energy which increases the cathodic temperature. By correlating Raman measurements, Kelvin Probe Force Microscopy (KPFM) maps, and electrical characterization under concentrated solar radiation, our paper shows that heterostructures made of Chemical Vapor Deposition (#CVD) #nanocrystalline #diamond (NCD) films grown on p-type Si(100) substrates act as photon-enhanced thermionic emitter (PETE) cathodes with an electron affinity as low as ∼0.4 eV. Moreover, our experimental findings indicate that sp²-carbon rich NCD grain boundaries play an extremely important role in the emission of electrons, increasing the probability of electronic transfer toward the emitting surface. #sustainability #materials #research #chemistry #MaterialScience #Innovation #solar_energy

The doors of the conference "Swiss Battery Days 2023" in Villigen/CH (https://lnkd.in/eezmuNsc) opened today. What a great event, what an amazing program with so many renowned speakers! Many thanks to the organizers for making this happen! If you are participating and want to have a chat with my colleague Christoffer about our latest developments for the characterization of #lithiumbattery #materials,  #solidstatebatteries and #solidstate #electrolytes, as well as the latest features of our #impedance #dataanalysis #software RelaxIS 3, please visit our booth. We are looking forward to meeting you there! #batteries #batterytechnology #lithium #sodium #lithiumionbatteries #anode #cathode #electrolyte #separator #electrochemistry #materialsscience #laboratoryequipment  #conference #researchanddevelopment #energyconversion #energystorage