Perovskite-Info: the perovskite experts

A research group led by Prof. LIU Shengzhong from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) has reported the fabrication of high efficiency large-area perovskite solar module using slot-die coating with high-pressure nitrogen-extraction (HPNE) and effective passivation strategy.

Slot-die coating is a promising deposition technique due to its advantages in low cost, high throughput, continuous roll-to-roll fabrication. However, it remains a challenge to control thin film uniformity over a large area at thickness as thin as 500 nm while maintaining crystallization quality.

Rice University and Texas A&M University researchers have found that a 2D derivative of perovskite could make computers faster and more energy-efficient. Their material has the ability to enable the valleytronics phenomenon, which is known as a possible platform for advanced information processing and storage.

The lab of materials scientist Jun Lou of Rice's Brown School of Engineering synthesized a layered compound of cesium, bismuth and iodine that is able to store the valley states of electrons, but only in the structure's odd layers. These bits can be set with polarized light, and the even layers appear to protect the odd ones from the kind of field interference that bedevils other perovskites, according to the researchers.

Florida State University (FSU) researchers are working to better understand the fundamental processes in perovskites. As art of this task, they found that small tweaks to the chemical makeup of the materials as well as the magnitude of the electrical field it is exposed to can greatly affect the overall material stability.

"How can we make perovskites more stable under real-world conditions in which they'll be used?" FSU Assistant Professor of Chemistry and Biochemistry Lea Nienhaus said. "What is causing the degradation? That's what we're trying to understand. Perovskites that don't degrade quickly could be a valuable tool for obtaining more energy from solar cells."

An exciting application for perovskite QDs, which is likely to be the first commercial adoption of pQDs, is for the display market - films that convert blue LED LCD backlight to green.

Switzerland-based nanomaterial developer Avantama told us that the company passed the OEM qualification with its green pQD film, together with a KSF phosphor solution on the LED chip. Avantama expects the first commercial LCD display to adopt this solution to hit the market in 2021.

Researchers at UNIST, POSTECH and the University of Pennsylvania have created a new perovskite-based nanocatalyst that can be used to recycle major greenhouse gases, such as methane (CH₄) and carbon dioxide (CO₂), into valuable hydrogen (H₂) gas.

The new catalyst is hoped to promote various waste-to-energy conversion technologies, as it has over twice the conversion efficiency from CH₄ to H₂ than the traditional electrode catalysts.

Researchers at Monash University, University of Sydney and University of Melbourne in Australia have addressed a fundamental challenge standing before massive commercialization of perovskite solar cells - light-induced phase segregation, in which illumination, such as sunlight, disrupts the carefully arranged composition of elements within mixed-halide perovskites.

Light-induced segregation often leads to instability in the material’s bandgap, interfering with the wavelengths of light absorbed, while reducing charge-carrier conduction and the efficiency of devices.

A team of researchers at the Ulsan Institute of Science and Technology (UNIST) and Korea University, led by Professors Myung-Hoon Song, Sang-Gyu Kwak and Han-Young Woo, recently announced the development of a PeLED - a perovskite-based LED device, that emits blue light.

The team explained that the perovskite light emitting device, which uses perovskite as a color material, is more than three times more efficient than before and has a high color purity, enabling a clear blue color.