Tackling perovskite solution aging issues could benefit solar cells and promote commercialization

The aging process of the perovskite solution used to fabricate solar cells makes the solution unstable, leading to poor efficiency and poor reproducibility of the devices. Reactants and preparation conditions also contribute to poor quality. To tackle these issues, a research team from the Qingdao Institute of Bioenergy and Bioprocess Technology (QIBEBT) of the Chinese Academy of Sciences (CAS) has studied the aging process of perovskite solution and proposed a way to avoid side reactions.

Researchers try to eliminate solution aging problems in perovskites image

Prof. PANG Shuping, corresponding author of the paper, said "an in-depth understanding of fundamental solution chemistry had not kept up with rapid efficiency improvements in perovskite solar cells, even though such cells have been studied for 10 years... Normally, we need high temperature and a long time to fully dissolve the reactants, but some side reactions can happen simultaneously," said Prof. PANG. "Fortunately, we have found a way to inhibit them."

Efficient tandem solar cell developed using wide bandgap perovskites

An international research team has developed a new type of solar cell that can both withstand environmental hazards and is 26.7% efficient in power conversion.

Highly efficient and stable double layer solar cell developed​ imageStructure and photovoltaic performance for the perovskite-Si tandem device. Image by KAIST

The researchers, led by Byungha Shin, a professor from the Department of Materials Science and Engineering at KAIST, focused on developing a new class of light-absorbing material, called a wide bandgap perovskite. The material has a highly effective crystal structure that can process the power needs, but it can become problematic when exposed to environmental hazards, such as moisture. Researchers have made some progress increasing the efficiency of solar cells based on perovskite, but the material reportedly has greater potential than what was previously achieved.

LayTec’s new InspiRe in-situ tool used for monitoring perovskite formation

Germany-based in-situ metrology system maker LayTec has announced that its new InspiRe system applies high-speed in-situ reflectance measurements for monitoring perovskite thin-film formations during spin-coating and subsequent annealing.

LayTec’s new InspiRe in-situ tool for control of perovskite formation image

In collaboration with professor Norbert Nickel’s group at HZB, LayTec designed the InspiRe in-situ metrology system, which was applied to monitor both spin-coating and annealing. Gathering data at a time resolution on the millisecond scale allows resolving of the kinetics and phase formations during film formation.

Researchers develop ultrafast, broadband perovskite photodetectors for large-dynamic-range imaging

Researchers at the Chinese Academy of Sciences (CAS) and other collaborators have reported a solution-processed broadband photodetector based on organic-inorganic hybrid perovskite and organic bulk heterojunction, achieving broadband response spectra up to 1000 nm with a high EQE in the NIR region, an ultrafast response speed of 5.6 ns and a wide linear dynamic range of 191 dB.

Schematic device structure of the perovskite photodetectors image

The team stated that thanks to the high-dynamic-range imaging capacity, high-quality visible-NIR actual imaging is obtained, enabling the accelerated translation of solution-processed photodetector applications from the laboratory to the imaging market.

Hexagonal perovskites hold great potential for ceramic fuel cell technology

Researchers from the University of Aberdeen have reported that a new family of chemical compounds known as ‘hexagonal perovskites’ could be extremely beneficial for ceramic fuel cell technology and reducing global carbon emissions.

Ceramic fuel cells are highly efficient devices that convert chemical energy into electrical energy and produce very low emissions if powered by hydrogen, providing a clean alternative to fossil fuels. Another advantage of ceramic fuel cells is that they can also use hydrocarbon fuels such as methane, meaning they can act as a ‘bridging’ technology which is an important asset in terms of the move away from hydrocarbons towards cleaner energy sources.