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Results for “Contact”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Systems dynamics and the uncertainties of diagnostics, testing and contact tracing for COVID-19
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Evidence for ?Unseen? Transposase?DNA Contacts
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Light-Mediated Contact Printing of Phosphorus Species onto Silicon Using Carbene-Based Molecular Layers
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Covalent Ag-C Bonding Contacts from Unprotected Terminal Acetylenes for Molecular Junctions
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Band Bending and Ratcheting Explain Triboelectricity in a Flexoelectric Contact Diode
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Bi–MoSe 2 Contacts in the Ultraclean Limit: Closing the Theory–Experiment Loop
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Improving Low-Bandgap Tin–Lead Perovskite Solar Cells via Contact Engineering and Gas Quench Processing
Low-bandgap Sn/Pb ABX 3 perovskites have reached photovoltaic power conversion efficiencies >20%, but they usually have poor stability due to the common use of acidic poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) hole transport layers and A-site cation compositions containing methylammonium (MA). In this work, we develop a process to enable high-quality MA-free Sn/Pb perovskite films grown using a gas quenching process instead of the conventional antisolvents, which provides improved control of the film growth and eliminates wrinkling. Using this method in a device structure with poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) instead of PEDOT:PSS as the hole transport layer, devices can reach efficiencies up to 20% mppt at 0.06 cm 2 and up to 17.5% mppt at 1 cm 2 active area. With these improvements, the devices are characterized for thermal stability and show 80% of the initial power output remaining after 4000 h at 85 °C.