7 documents found, page 1 of 1
Network nodes for ocean data exchange through submarine fiber optic cable repea...
Martins, M. S.; Cruz, Nuno A.; Silva, António; Ferreira, Bruno; Zabel, Fred; Matos, Tiago; Jesus, Sergio; Pinto, André; Pereira, Eduardo; Matos, AníbalAs humanity progresses and globalization advances, humanized environment and associated systems increase in complexity and size. In earth systems, oceans represent an essential element of equalization and normal functioning. Ocean-atmospheric interactions are nowadays believed to be at the heart of all earth vital signs and climatic behaviours, and therefore are essential to accurate monitoring and understandin...
Perovskite ferroelectric thin film as an efficient interface to enhance the pho...
Silva, José Pedro Basto; Vieira, E. M. F; Silva, J. M. B.; Gwozdz, K.; Figueiras, F. G.; Veltruská, K.; Matolín, V.; Istrate, M. C.; Ghica, C.The photovoltaic (PV) response of SnOx/Si heterojunctions (HJs) through the change of the SnO and SnO2 ratio in the samples that allows us to obtain p- or n-type SnOx films is investigated in this work. The values of short-circuit photocurrent density (Jsc), open-circuit voltage (VOC), fill factor (FF) and power conversion efficiency (PCE) are found to be 12.6 mA cm−2, 0.23 V, 27% and 8.3%, for the p-SnOx/n-Si ...
Lithium cobalt oxide crystallization on flexible polyimide substrate
Ribeiro, J. F.; Sousa, R.; Vieira, E. M. F.; Rolo, Anabela G.; Silva, Maria Manuela; Dupont, L.; Correia, J. H.; Goncalves, L. M.This work reports the fabrication and characterization of lithium cobalt oxide films (LiCoO2) on flexible Kapton® substrate. LiCoO2 is commonly used as cathode of lithium microbatteries but needs an annealing of 700 °C, which is not compatible with most flexible substrates. LiCoO2 films were deposited by reactive RF sputtering followed by an annealing process at 400 °C for 1 h in vacuum and air atmospheres both...
Titanium oxide adhesion layer for high temperature annealed Si/Si3N4/TiOx/Pt/Li...
Vieira, E. M. F.; Ribeiro, J. F.; Sousa, R; Silva, Maria Manuela; Dupont, L.; Goncalves, L. M.This work describes the influence of a high annealing temperature of about 700C on the Si(substrate)/Si3N4/TiOx/Pt/LiCoO2 multilayer system for the fabrication of all-solid-state lithium ion thin film microbatteries. Such microbatteries typically utilize lithium cobalt oxide (LiCoO2) as cathode material with a platinum (Pt) current collector. Silicon nitride (Si3N4) is used to act as a barrier against Li diffus...
Ge thin film anode in a flexible solid-state Li-ion microbattery
Vieira, E. M. F.; Ribeiro, J. F.; Rua, João; Silva, Maria Manuela; Correia, J. H.; Goncalves, L. M.Flexible solid-state lithium ion batteries (LIBs) have become an important part of the portable electronics due to their flexibility, lightweight, easy portability, security and the ability to be adjusted in large-scale energy storage microsystems, with significantly high power and long cycle life. Germanium (Ge) is a promising anode material for high-generation LIBs, with high theoretical capacity (1600 mAh/g ...
Flexible solid-state Li-ion battery using Ge thin film anode and LiCoO2 cathode
Vieira, E. M. F.; Ribeiro, J. F.; Silva, M. M.; Dupont, L.; Correia, J. H.; Goncalves, L. M.Flexible and solid – state Li-ion bat-teries (LIBs) can offer flexibility, lightweight and easy portability in large-scale energy storage, with significantly higher power and long cycle life. The anode is a crucial component affecting the perfor-mance of LIBs. Here, we investigate the electrochem-ical performance of e-beam deposited Ge anode (300 nm thick) coupled with LiCoO2/LiPON (cath-ode/solid-state electro...
A chemically stable PVD multilayer encapsulation for lithium microbatteries
Ribeiro, J. F.; Sousa, R.; Cunha, D. J.; Vieira, E. M. F.; Silva, Maria Manuela; Dupont, L.; Goncalves, L. M.A multilayer physical vapour DEPOSITION (PVD) thin-film encapsulation method for lithium microbatteries is presented. Lithium microbatteries with a lithium cobalt oxide (LiCoO2) cathode, a lithium phosphorous oxynitride (LiPON) electrolyte and a metallic lithium anode are under development, using PVD DEPOSITION techniques. Metallic lithium film is still the most common anode on this battery technology; however,...