New glass–crystalline switching ability of metal halide perovskites could open new opportunities for novel memory devices, optical communication and neuromorphic computing

Researchers at Duke have examined crystalline metal halide perovskites (MHPs), and found that while crystallinity offers numerous advantages, the ability to access a glassy state with distinct properties can provide unique opportunities to extend the associated structure–property relationship, as well as broaden the application space for MHPs.

Duke's new glass–crystalline switching ability of metal halide perovskites could open new opportunities image

Amorphous analogs for MHPs have so far been restricted to high pressures, limiting detailed studies and applications. In their new work, the Duke team structurally tailored a 2D MHP using bulky chiral organic cations to exhibit an unusual confluence of exceptionally low melting temperature (175 °C) and inhibited crystallization.

Researchers devise synthesis method for perovskite nanocrystals with 12 and 26 facets

India-based researchers have recently designed a novel synthesis procedure that can produce highly uniform luminescent perovskite nanocrystals with uncommon shapes and surface morphologies.

Their work broadens the range of strategies that can be used for tuning the optical and photonic properties of these materials, which are widely studied for use in solar cells, light-emitting diodes, and electronic displays.

UNIST researchers develop high-performance perovskite oxide catalysts using late transition metal oxide materials

A research team, jointly led by Professor Gun-Tae Kim and Professor Jun-Hee Lee in the School of Energy and Chemical Engineering at South-Korea's UNIST has succeeded in developing high-performance perovskite oxide catalysts using late transition metal oxide materials. In the process, the team discovered the reason behind the improved performance of both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), which has been explained by the change in the oxidation state of the transition metal caused by the increase in oxygen vacancies.

Perovskite oxide catalysts are composed of lanthanide, transition metal and oxygen. Owing to the excellent electrical conductivity and bifunctional ORR/OER activity, these catalysts have been considered to be an attractive candidate for metal-air batteries or fuel cells, in which opposite reactions, such as charging and discharging occur steadily. However, due to the high cost and low stability of noble metal catalysts, the development of alternatives is strongly desired.

HZB team designs a quick and easy method to assess new compositions of perovskite materials

Researchers at HZB have reported findings from their recent work: printing and exploring different compositions of caesium based halide perovskites (CsPb(BrxI1−x)3 (0 ≤ x ≤ 1)).

New screening process by HZB could locate potential perovskite materials for solar cells image

In a temperature range between room temperature and 300 Celsius, the team observed structural phase transitions influencing the electronic properties. The study presents a quick and easy method to assess new compositions of perovskite materials in order to identify potential candidates for applications in thin film solar cells and optoelectronic devices.

Researchers achieve magnetic lead-free halide double perovskites

Researchers at Linköping University in Sweden have announced the development of an optoelectronic magnetic double perovskite. The discovery could open the door to combining spintronics with optoelectronics for rapid and energy-efficient information storage.

The team explains that one type of perovskite that contains halogens and lead has recently been shown to have interesting magnetic properties, opening the possibility of using it in spintronics. Spintronics is thought to have huge potential for the next generation of information technology, since information can be transmitted at higher speeds and with low energy consumption. However, magnetic properties of halide perovskites have until now been associated only with lead-containing perovskites, which has limited the development of the material for both health and environmental reasons.