Perovskite-Info is a news hub and knowledge center born out of keen interest in the wide range of perovskite materials.
Perovskites are a class of materials that share a similar structure, which display a myriad of exciting properties like superconductivity, magnetoresistance and more. These easily synthesized materials are considered the future of solar cells, as their distinctive structure makes them perfect for enabling low-cost, efficient photovoltaics. They are also predicted to play a role in next-gen electric vehicle batteries, sensors, lasers and much more.
Researchers at UC Santa Barbara have discovered an important factor that limits the efficiency of perovskite solar cells.
Various possible defects in the lattice of hybrid perovskites had previously been considered as the potential cause of such limitations, but it was assumed that the organic molecules would remain intact. The team has now revealed that missing hydrogen atoms in these molecules can cause massive efficiency losses.
Researchers at the Karlsruhe Institute of Technology (KIT) have produced perovskite solar modules with greatly reduced loss of efficiency due to scaling. The team reported an efficiency of 18% for a perovskite solar module with an area of 4cm2 - a world record for vacuum-processed perovskite solar modules. To this end, they combined the series connection by laser with the vacuum processing of all layers of the solar cell.
"One of the main challenges is to transfer the efficiencies achieved on areas of a few square millimeters to typical solar module surfaces of a few hundred square centimeters," says Dr. Tobias Abzieher, who heads the development of perovskite solar cells deposited from a vacuum at the Light Technology Institute (LTI) of the KIT. Perovskite solar cells are often joined together to form large-area solar modules using the so-called monolithic series connection. For this purpose, structuring lines are introduced during the deposition of the individual layers of the solar cell, which causes the solar cell strips to be connected in series.
Researchers at the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) have reported a breakthrough in energy-efficient phototransistors - devices that could someday help computers process visual information similarly to the human brain and be used as sensors in applications like self-driving vehicles.
The structures rely on metal-halide perovskites. Jeffrey Blackburn, a senior scientist at NREL and co-author of a new paper outlining the research, said: “In general, these perovskite semiconductors are a really unique functional system with potential benefits for a number of different technologies”. “NREL became interested in this material system for photovoltaics, but they have many properties that could be applied to whole different areas of science.”
A University of North Texas researcher and his team have reported a breakthrough in using additive manufacturing to further research into flexible solar panels.
Anupama Kaul, Professor of Engineering from the Departments of Materials Science and Engineering and Electrical Engineering, has successfully used additive manufacturing to print inks of 2D perovskites.
Researchers at AMOLF have found a way to manipulate the speed of the 'hot carrier cooling' process in perovskites. In this process, high energy photons lose their excess energy in the form of heat before being converted to electricity. In solar cells, about two thirds of the energy of sunlight is lost - and half of this loss stems from the hot carrier cooling process.
Schematic representation of the pressure-dependent setup. Image from JACS article
The AMOLF team found a way to manipulate the speed of this process in perovskites, by applying pressure to the material. This paves the way for making perovskites more versatile, not only for use in solar cells but also in a variety of other applications, from lasers to thermoelectric devices.
Solliance partners TNO, imec/EnergyVille and the Eindhoven University of Technology, have reported a 18.6% efficient highly near infrared transparent perovskite solar cell. When combined in a four terminal tandem configuration with an efficient Panasonic crystalline silicon (c-Si) cell or with a Miasolé flexible CIGS cell, the configuration delivered new record power conversion efficiencies of 28.7% and 27.0%, respectively.
The researchers explained that four terminal tandems allow to build on experience and practices already available in the industry. In addition, four terminal perovskite/c-Si tandems can be applied broadly and are, for example, very beneficial in combination with bifacial c-Si solar cells which, depending on the actual albedo, can readily achieve a total power generation density as high as 320 W/m².
NASA has announced that a small satellite, designed and built by Brown University students, will ride on a future rocket launch.
Image credit: Brown University
The new satellite, dubbed PVDX (Perovskite Visuals and Degradation eXperiment), is a cubesat — a class of miniature satellites ideal for doing low-cost science experiments or technology demonstration in space. Members of Brown Space Engineering (BSE), a student group, worked for three years to develop a mission plan and proposal for NASA’s Cubesat Launch Initiative, which uses auxiliary cargo space on rockets to send cubesats to space.