Researchers at Australia's University of Sydney, University of New South Wales, Macquarie University, Germany's Forschungszentrum Jülich, China's Southern University of Science and Technology ans Slovenia's University of Ljubljana have developed a perovskite-silicon solar cell design using a top perovskite PV device with an energy bandgap of 1.67 eV and a self-assembly monolayer based on carbazole. The tandem cell achieved a higher efficiency compared to counterparts without the monolayer and passed the IEC 61215 standard thermal cycling test.

The device is intended for applications as a top cell in perovskite-silicon tandem solar devices, where the upper cells must have a high energy bandgap to achieve output current matching. These top cells, however, suffer from a higher bandgap-voltage offset, due to non-radiative recombination and energetic misalignment between the perovskite and charge-selective layers. To address this issue, the team utilized a self-assembled monolayer (SAM) based on carbazole, which acts as an effective hole-selective layer (HSL). These SAMs were previously utilized in experimental solar cells and are commonly developed through a molecular glue added during processing in order to dramatically improve adhesion between the light-absorbing perovskite layer and the electron transport layer.

Researchers at China's Wuhan University assume that the practical use of all-perovskite tandem solar cells is hampered by the subpar performance and stability issues associated with mixed tin–lead (Sn–Pb) narrow-bandgap perovskite subcells. In their recent study, they focus on these narrow-bandgap subcells and develop an all-in-one doping strategy for them. 

The scientists introduce aspartate hydrochloride (AspCl) into both the bottom poly(3,4-ethylene dioxythiophene)–poly(styrene sulfonate) and bulk perovskite layers, followed by another AspCl posttreatment. They show that a single AspCl additive can effectively passivate defects, reduce Sn⁴⁺ impurities and shift the Fermi energy level. 

Researchers at the Chinese Academy of Sciences (CAS), Beijing Normal University, Beijing Institute of Technology and ShanghaiTech University have developed a universal hydrogen-bonding-facilitated DMA extraction method to fabricate high-quality γ-CsPbI3 films. The researchers fabricated a solar cell based on cesium-lead iodide (CsPbI₃) perovskite, which is also known as black perovskite.

The black perovskite solar cell reportedly achieved  20.25% efficiency, which is said by the team to be the highest efficiency reported for PV devices built with this perovskite material and a dopant-free hole transport layer based on the P3HT polymer. The cell was also able to retain around 93% of its original efficiency after continuous illumination for 570 h.

Researchers at China's Hefei Institutes of Physical Science (HIPS), University of Science and Technology of China (USTC), Southern University of Science and Technology (SUSTech), Hainan University, Germany's IEK5-Photovoltaics and University of Duisburg-Essen have proposed a strategy to enhance the performance of perovskite solar cells through the creation of a robust connection between different layers of the solar cell, using a molecular bridge made of ammonium cations.

The term 'fill factor' (FF) represents the capacity of a solar cell to deliver maximum current under optimal conditions. As limitations associated with FF still pose challenges, any advancements in this area are highly sought after. To address these limitations, the team focused on optimizing the bottom interface of the solar cell. They developed a strategy to redistribute localized electrostatic potential by employing ammonium cations as a molecular bridge with various degrees of substitution.

Reports suggest that BYD COMPANY aims to ramp up its R&D efforts in solar energy technologies, by setting up a team of professional researchers that will work on achieving cost reduction and efficiency enhancements.

With the advancement of crystalline silicon photovoltaic technology, BYD COMPANY is transitioning from PERC cell technology to N-type TOPCon and HJT cell technology, and has been actively exploring perovskite cell technology, with the aim to achieve higher conversion efficiency and stimulate technological innovations.

Reports suggest that LONGi Green Energy Technology managed to reach a conversion efficiency of 33.9% for its silicon-perovskite tandem solar cells.

The result, currently the highest efficiency record in the world for a perovskite/silicon tandem cell, has reportedly been confirmed by the US National Renewable Energy Laboratory (NREL).

An international team that included scientists from the Chinese Academy of Sciences (CAS), Southern University of Science and Technology (SUSTech), University of Science and Technology of China (USTC), Sungkyunkwan University (SKKU), The Hong Kong University of Science and Technology, University Grenoble-Alpes, CEA, CNRS, INP, IRIG/SyMMES, IEK5-Photovoltaics and North China Electric Power University (NCEPU), has proposed a new method of fabricating homogenized perovskite films for solar cells. 

The process involves inhibiting phase segregation caused by internal cation inhomogeneity to increase conversion efficiency to 26.1%, thus tying the existing record.

Researchers at Empa, National University of Singapore (NUS) and Helmholtz Institute Erlangen-Nürnberg for Renewable Energy HI ERN have reported novel electrical and optical enhancement approaches to maximize the performance of perovskite front cells. 

The team introduced new electrical and optical techniques, using methyldiammonium diiodide and adjusting the optical interference spectrum. This resulted in a record efficiency of 20.2% (21.8% by J-V scan) for a semi-transparent perovskite cell and 81.5% average near-infrared transmittance. 

Researchers from the University of Rome Tor Vergata, ENEA and CNR-ISM have used protective buffer layers in perovskite solar cells to mitigate damage during the sputtering of indium tin oxide in the production process. The scientists claim the buffer layers were able to achieve this without damaging the cell’s average visible transmittance.

The cell utilizes buffer layers made of transition metal oxides (TMOs) intended to protect the cell during the sputtering of indium tin oxide (ITO) in the cell production process. The scientists tested, in particular, two different evaporated transition metal oxides (TMOs) – molybdenum oxide (MoO_x) and vanadium oxide (V₂O_x)  and found the former provided the best performance.

A research team, led by Rice University chemical and biomolecular engineer Aditya Mohite and collaborators at Northwestern University, the University of Pennsylvania and the University of Rennes, reported a process that yields 2D perovskite-based semiconductor layers of ideal thickness and purity by controlling the temperature and duration of the crystallization process.

Known as kinetically controlled space confinement, the process could help improve the stability and reduce the cost of halide perovskite-based emerging technologies like optoelectronics and photovoltaics.