Descrizione del progetto
I componenti ibridi piezoelettrici-fotovoltaici aprono la strada alla miniaturizzazione dei dispositivi IoT
I progressi dei materiali e le tecnologie di elaborazione hanno portato allo sviluppo di componenti elettronici sempre più piccoli. Tuttavia, man mano che questi componenti si rimpiccioliscono e si avvicinano l’uno all’altro, l’interferenza tra loro diventa una sfida. Il progetto UNIFY, finanziato dall’UE, affronterà questo problema unificando due componenti fondamentali ma contraddittori, il piezoelettrico e il fotovoltaico, in un unico materiale fotoferroelettrico. I componenti piezoelettrici convertono l’energia cinetica in energia elettrica, mentre quelli fotovoltaici la trasformano in energia elettrica. La sostituzione di componenti distinti con un unico componente potrebbe rivoluzionare la conversione dell’energia meccanica e solare in energia elettrica per applicazioni come l’Internet delle cose (IoT), che richiede la progettazione di dispositivi connessi in prodotti sempre più piccoli e con una durata maggiore.
Obiettivo
The piezoelectric (PE) effect is the core electromechanical coupling function widely used in sensors, actuators and transducers for various industrial sectors. The photovoltaic (PV) effect produces green electricity from the solar energy. To date, materials showing strong PE and efficient PV properties are separate families of oxide perovskites and narrow band gap semiconductors, respectively. This project aims to unify these PE and PV performances by making new photoferroelectric materials. Photoferroelectrics can be both ferroelectric and photovoltaic. However, several challenges hinder them from being practically used as single, integrated PE-PV materials: (i) Not all good ferroelectrics show strong PE responses; (ii) The strong piezoelectrics have wide band gaps, unable to absorb visible lights; (iii) The photovoltaic energy conversion efficiencies (PCE) of photoferroelectrics are far below those of semiconductor solar cells. To address the challenges, this project will (1) start with the oxide perovskite compositions showing the record PE properties. These compositions will be engineered by doping to reduce the band gaps and thus to absorb the entire visible lights whilst maintaining the original PE properties. (2) The engineered compositions will be grown to single crystals to further boost the PE properties and to form stacked domain walls. (3) The stacked domain walls will generate photovoltages that can add up domain by domain, producing an ultra high net photovoltage in the material. (4) The efficient photocurrent generation in the domain walls will be boosted by the complete light absorption resulted from the single crystal thickness equal to the light penetration depth, pushing the PCE to the level of semiconductor solar cells. The results are expected to trigger revolutions in mechano-solar-electric multi-energy converters for emerging applications such as Internet of Things that require long lifespan and miniaturization.
Campo scientifico
- natural sciencesphysical scienceselectromagnetism and electronicssemiconductivity
- engineering and technologyelectrical engineering, electronic engineering, information engineeringelectrical engineeringpiezoelectrics
- engineering and technologyenvironmental engineeringenergy and fuelsenergy conversion
- engineering and technologyenvironmental engineeringenergy and fuelsrenewable energysolar energyphotovoltaic
Programma(i)
- HORIZON.1.1 - European Research Council (ERC) Main Programme
Argomento(i)
Meccanismo di finanziamento
HORIZON-AG - HORIZON Action Grant Budget-BasedIstituzione ospitante
90014 Oulu
Finlandia