HYbrid organic-inorganic PERovskite THERMoelectrics

Informations projet

HYPERTHERM

N° de convention de subvention: 798271

DOI

10.3030/798271

Projet clôturé

Date de signature de la CE 26 Mars 2018

Date de début 4 Février 2019

Date de fin 3 Février 2021

Financé au titre de

• EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions

Coût total

€ 183 454,80

Contribution de l’UE

€ 183 454,80

Coordonné par

QUEEN MARY UNIVERSITY OF LONDON
United Kingdom

Periodic Reporting for period 1 - HYPERTHERM (HYbrid organic-inorganic PERovskite THERMoelectrics)

Période du rapport: 2019-02-04 au 2021-02-03

Résumé du contexte et des objectifs généraux du projet

Issue. Thermoelectric technology that allows the recovery of wasted heat at low temperatures is still in its infancy. One of the reasons for the slow take-up of thermoelectric technology is the manufacturing cost, which includes costly materials, waste, and cumbersome manufacturing processes. Additionally, the recovery of the heat below 100 °C is still ineffective. The project aimed to develop solution-processable thermoelectric materials, to yield highly efficient thermoelectric generators at a low-temperature regime.

Impact. The development of new high-performance materials could lead to the creation of efficient devices for transforming waste heat into electricity. Recycling this heat would make society more sustainable. The results obtained could also be exploited to design flexible thermal sensors to be integrated into e-skin (e.g. smart prosthesis). The study of charge transport phenomena in quasi-0D perovskites will provide new stimuli to the research sector.

Overall objectives. HYPERTHERM aimed to advance the quasi-0D hybrid perovskites by controlling their composition, doping and nanostructure. Moreover, the materials have been designed to be solution assembled, using easily accessible components, and deposited by automated printing processes with a high reduction of the manufacturing costs.

Travail effectué depuis le début du projet jusqu’à la fin de la période considérée dans le rapport et principaux résultats atteints jusqu’à présent

Work performed:
- Synthesis of single crystals of pristine and Sn-doped (CH3NH3)3Bi2I9.
- Deposition of compact thin films of pristine and Sn-doped (CH3NH3)3Bi2I9.
- Study of the charge confinement properties.
- Study of quasi-0D perovskites thermoelectric properties.
- Develop a methodology to obtain pellets from polycrystalline perovskite powders.
- Synthesis of S-doped (CH3NH3)3Bi2I9 single crystals.
- Study of ionic and electronic conduction in perovskite single crystals.
- Study of the thermochromic properties of quasi-0D perovskites.
- Design of ink deposition of doped quasi-0D perovskites.

Visibility was given to the project through participation in scientific symposia and conferences. The purpose and objectives explained to a broader audience through online seminars and educational videos. The results will be published in the open-access journal when the drafting of the manuscript is completed. The datasets publication in an open-access portal will follow the publication of the works.

Progrès au-delà de l’état des connaissances et impact potentiel prévu (y compris l’impact socio-économique et les conséquences sociétales plus larges du projet jusqu’à présent)

Beyond the state of the art.
- The work demonstrated that quasi 0-dimensional perovskites could be doped to increase their electrical conductivity.
- A technique for obtaining compact thin films has been developed.
- The study of the optical properties in correlation with the reaction kinetics enriches the knowledge on quasi-0D perovskites.
- The straightforward synthesis of doped single crystals designed generates samples bigger than those reported in the literature.
- The excitonic peaks of the material were studied in single crystals and thin films. The conclusions reached enrich the knowledge of this class of materials.
- The synthesised S-doped single crystals help to understand the charge transport properties in these compounds.
- Substantial advances are proposed in the understanding of charge transport mechanisms in doped perovskites.
- The tested materials have generated Seebeck coefficients beyond the best expectations; further tests are underway to validate the result obtained.

Potential impacts.
- Creation of efficient devices for transforming waste heat at low-temperature regime into electricity. The consequences on the economy and daily life would be enormous. Energy savings would fall on transport, construction, industrial production, and regular daily consumption. The impact of a real application of thermoelectric to produce sustainable energy would be revolutionary.
- Design of flexible thermal sensors to be integrated into e-skin (e.g. smart prosthesis). Electronic skin is used in both medical and military sectors. Besides, extreme interest in flexible thermal sensors comes from the security and surveillance sector.
- The study of charge transport phenomena in quasi-0D perovskites will provide new stimuli to the research sector. The review of this class of materials is very young, and the applications are many (LED, laser, detector, super-capacitor, memristor); HYPERTHERM conclusions give a boost to the knowledge of these compounds.

Doped single crystals

Thermal evaporation deposition

Drop casting

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