November 2023

Researchers in Sweden and China have studied the reasons behind the short operational lifetime of blue perovskite-based LEDs (PeLEDs). 

While perovskite light-emitting diodes (PeLEDs) have seen unprecedented development in device efficiency over the past decade, they still suffer from poor operational stability. This is especially true for blue PeLEDs, whose operational lifetime remains orders of magnitude behind their green and red counterparts. The scientists in this work have systematically investigated this efficiency-stability discrepancy in a series of green- to blue-emitting PeLEDs based on mixed Br/Cl-perovskites. Typically, mixed chloride/bromide perovskites are employed to produce ideal blue emission. However, the researchers have uncovered a counterintuitive fact: even minute quantities of chloride loading can have a dramatic negative impact on the operational lifetime of these devices. 

Researchers from AMOLF have used perovskite semiconductors to develop a simple spray test to detect the presence of lead. A lead-containing surface shines bright green when it is sprayed with the test, which is said to be a 1,000 times more sensitive than existing tests and the researchers found no false positive or false negative results. 

"We have hijacked the technology of perovskite semiconductors and used it in a widely deployable lead test. Nobody in this discipline had ever thought of that," says Lukas Helmbrecht, researcher at the group Self-Organizing Matter led by Wim Noorduin at AMOLF. "We are very pleased with these results," says Noorduin. "It is a really cool project and it is quite rare for fundamental research to literally impact the entire world with an application."

It was reported that China-based Ideal Deposition Equipment, a technology and equipment company with chemical vapor deposition technology as its core, has entered into a supply agreement with a top American photovoltaic company for manufacturing perovskite cells.

Ideal Deposition primarily focuses on producing equipment for PERC and TOPCon production. In recent years, it has launched a series of related equipment for mainstream photovoltaic cell producers worldwide. Additionally, it manufactures coating equipment for tandem layers of perovskite cells.

China-based BOE Technology Group (BOE), one of the leading companies in the global display technology field, recently launched a project to enter the photovoltaic industry by investing in perovskite solar cells. BOE held a ceremony to launch the project

It is believed that BOE's entry into the perovskite solar cell market will bring new energy to the industry, which is in line with the country's renewable energy policy. The Company has a strong R&D team and extensive experience in display technologies, which could be applied to the development of perovskite solar cells. BOE has also established partnerships with top universities and research institutions to promote the development of perovskite solar cells.

Researchers from the Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Germany's University of Potsdam and The Chinese University of Hong Kong have addressed an important aspect in the field of perovskite solar cells (PSCs) – the exact role of excess lead iodide content within the perovskite layer. While an optimal amount of excess lead iodide contributes to improved grain boundary passivation and blocking of minority charge carriers, leading to the development of highly efficient PSCs, the photo-stability of PSCs with surplus lead iodide remains a major concern. This concern stems from the catalytic role excess lead iodide can play in the degradation of PSCs under illumination.

The issue often arises during the fabrication of perovskite films using a two-step spin coating method, where the conversion of lead iodide films to perovskite is hindered due to challenges in controlling the reaction between lead iodide films and cationic precursor solutions. Various modifications of the two-step approach are presented in the literature, each aiming to achieve a near full conversion of lead iodide films into perovskite when exposed to cationic precursor solutions.

GCL Photoelectric Materials (GCL Perovskite), a subsidiary of GCL Tech, has announced that it was able to attain a photoelectric conversion efficiency of 18.04% on a perovskite single-junction solar module, with dimensions measuring 1,000mm by 2,000mm. It was reported that this result was officially tested and confirmed by the China National Institute of Metrology.

GCL Perovskite team has been working on achieving this objective of exceeding the anticipated conversion efficiency of 18% for standard-sized perovskite modules, and the team will now focus on conducting research and development for the next-generation perovskite tandem modules.

According to recent reports, China-based Xi'an Tianjiao New Energy has obtained nearly 100 million yuan (over USD$14,100,00) in angel round financing, led by Winreal Investment. The funds will primarily be used for building a perovskite pilot production line with a capacity of 10MW alongside other operational expenses covering consumables and staff.

Tianjiao, a perovskite solar cell developer, specializes in manufacturing single-cell perovskite modules including both flexible and rigid types. The rigid modules find their use primarily in PVBI, whereas the flexible ones are mounted on car roofs or used in 5G base stations.

French PV module manufacturer Voltec Solar has secured €9.3 million ($10.1 million) from Ademe, France’s environmental agency. The company plans to use the funds to accelerate the production of perovskite-silicon tandem solar panels.

The French manufacturer currently operates two 250 MW production lines at its factory in Dinsheim-sur-Bruche, France.

Researchers of Karlsruhe Institute of Technology (KIT) and of two Helmholtz platforms—Helmholtz Imaging at the German Cancer Research Center (DKFZ) and Helmholtz AI—have found a way to predict the quality of the perovskite layers and consequently that of the resulting solar cells. Using machine learning and new methods in artificial intelligence (AI), it is possible to assess their quality from variations in light emission already in the manufacturing process.

"Manufacturing these high-grade, multi-crystalline thin layers without any deficiencies or holes using low-cost and scalable methods is one of the biggest challenges," says tenure-track professor Ulrich W. Paetzold who conducts research at the Institute of Microstructure Technology and the Light Technology Institute of KIT.

Tokyo Institute of Technology researchers have shown that donor doping into a mother material with disordered intrinsic oxygen vacancies, instead of the widely used strategy of acceptor doping into a material without oxygen vacancies, can greatly enhance the conductivity and stability of perovskite-type proton conductors at intermediate and low temperatures of 250–400 ℃, (e.g. 10 mS/cm at 320 ℃). This approach provides a new design direction for proton conductors for fuel cells and electrolysis cells.

Protonic ceramic (or proton conducting) fuel/electrolysis cells (PCFCs/PCECs) are a strong contender for future sustainable energy technologies. These devices can directly convert chemical energy into electricity and vice versa with zero emissions at low or intermediate temperatures, making them an attractive option for many emerging applications such as next-generation distributed power sources. In addition, unlike other types of fuel cells and electrolysers, the PCFCs/PCECs do not require precious metal catalysts or expensive, heat-resistant alloys.