Tandem - Page 13

Researchers from Eindhoven University of Technology, Delft University of Technology and TNO (partner in Solliance) have designed an integrated solar-assisted water-splitting system with a flow electrochemical cell and a monolithic perovskite-silicon tandem solar cell.

The team's work demonstrates how a perovskite/silicon tandem cell can be combined with a water electrolyzer system. However, the team said that there are still many steps that need to be taken before commercialization is possible. For example: upscaling the technology, addressing stability in greater detail, and use of more earth-abundant catalysts in the water-splitting reaction.

South Korea-based Qcells and a European research group (led by Helmholtz-Zentrum Berlin (HZB)) have jointly established a pilot manufacturing line for silicon-perovskite tandem cells in Thalheim, Germany. The project aims to speed up the technology’s mass manufacturing and market penetration. The project began on 1 November.

The so-called "Pepperoni project" will establish a pilot manufacturing line in Thalheim, Qcell’s headquarters in Germany. The name stems from the broader project titled ‘Pilot line for European Production of PEROvskite-Silicon taNdem modules on Industrial scale' or PEPPERONI.

Scientists from the Centre for Solar Energy and Hydrogen Research Baden-Württemberg (ZSW) have achieved 21.1 percent efficiency with tandem perovskite - CIGS solar cells. These thin-film-based modules are highly efficient, light and flexible and can open doors to many new use cases for which standard rigid modules are not suitable.

ZSW’s tandem solar module has an area of nine square centimeters and achieves 21.1 percent efficiency. This prototype also features scalable component architecture suitable for industrial manufacturing. The best performance attained to date with tandem solar modules made of perovskite and CIGS is just slightly higher at 22 percent. ZSW has already achieved an excellent efficiency level of 26.6 percent with this combination of materials in smaller laboratory cells.

Researchers from Northwestern University, University of Toronto and the University of Toledo have developed an all-perovskite tandem solar cell with extremely high efficiency and "record-setting" voltage.

“Further improvements in the efficiency of solar cells are crucial for the ongoing decarbonization of our economy,” says U of T Engineering Professor Ted Sargent (ECE). “While silicon solar cells have undergone impressive advances in recent years, there are inherent limitations to their efficiency and cost, arising from material properties. Perovskite technology can overcome these limitations, but until now, it had performed below its full potential. Our latest study identifies a key reason for this and points a way forward.”

French solar module manufacturer Voltec Solar and the Institut Photovoltaïque d’Île-de-France (IPVF) have announced plans to set up a factory for four-terminal (4T) tandem perovskite-silicon solar panels in France. The “France PV Industrie” project aims to build a gigafactory for solar panels, with a dual objective: to produce more efficient solar panels locally and to create a sustainable industry, based on a fast-growing market and a breakthrough technology.

The IPVF and Voltec plan to create a joint venture (France PV Industrie) so they can secure the necessary financing to scale up to industrial production. The pilot line will require an investment of €15 million ($15.4 million) and the industrial demonstrator €50 million. The partners estimate the total investment at around €1 billion by 2030. The facility will make modules based on IPVF's 4T tandem solar cell technology. The two entities plan to set up the first pilot production line by the end of 2023 and the first 200 MW industrial demonstrator in 2025. They will then increase the factory's capacity to 1 GW in 2027 and 5 GW by 2030.

Chinese perovskite solar technology company Renshine Solar (Suzhou) has announced achieving steady-state efficiency of 24.50% for all-perovskite tandem cell module, which it called 'a world record'.

It was reported that the efficiency was achieved for a perovskite module with an area of 20.25 cm², which exceeds that of perovskite single-junction components. The new efficiency level has been certified by Japan’s JET, it added without sharing other details.

Researchers from Helmholtz-Zentrum Berlin (HZB) and Potsdam University have reported perovskite–silicon tandem solar cells with periodic nanotextures that offer various advantages without compromising the material quality of solution-processed perovskite layers. Textured tandem devices have been presented before, aiming at improved optical performance, but optimizing film growth on surface-textured wafers has thus far remained challenging.

The research team showed a reduction in reflection losses in comparison to planar tandems, with the new devices being less sensitive to deviations from optimum layer thicknesses. The nanotextures also enabled a greatly increased fabrication yield from 50% to 95%. Moreover, the open-circuit voltage was improved by 15 mV due to the enhanced optoelectronic properties of the perovskite top cell. The optically advanced rear reflector with a dielectric buffer layer resulted in reduced parasitic absorption at near-infrared wavelengths. As a result, the team achieved a certified power conversion efficiency of 29.80%.

A team of scientists, led by Professor Hairen Tan of Nanjing University, has demonstrated (for was the team states is the first time) bifacial all-perovskite monolithic tandem solar cells and examined their output power potential.

The research team demonstrated the design and fabrication of bifacial all-perovskite tandem solar cells using transparent conductive oxide (TCO) as the back electrode. The bandgap technique of the top subcell was used to obtain current matching under different backlights. The influence of the albedo on the photovoltaic parameters and the spectral sensitivity was systematically investigated. The bifacial tandems reportedly showed a high output power density of 28.51 mW cm⁻² under a realistic rear illumination (30 mW cm^{− 2}). Further energy yield calculation showed substantial energy yield gain for bifacial tandems compared with the monofacial tandems under various ground albedo for different climatic conditions. This work provides a new device architecture for higher output power for all-perovskite tandem solar cells under real-world conditions.

Researchers from Zhejiang Energy Group R&D and the Chinese Academy of Sciences (CAS) have reported what they say is "the first monolithic perovskite/silicon tandem featuring an industrially applicable front-side-nanostructured black silicon with a tunnel oxide passivated contact (TOPCon)".

The TOPCon together with the surface reconstruction of black silicon contributes to the high-level surface passivation without sacrificing the broadband light trapping. Additionally, the reconstructed nanotexture significantly facilitates the wetting of perovskite and acts as a nanoconfining scaffold to guide the vertical growth of perovskite.

Researchers from Helmholtz-Zentrum Berlin (HZB) have demonstrated the scalable fabrication of perovskite/silicon tandem solar cells with optimized bandgap using the slot-die coating method. The team used slot-die coating for an efficient, 1.68 eV wide bandgap triple-halide (3halide) perovskite absorber, (Cs_0.22FA_0.78)Pb(I_0.85Br_0.15)₃ + 5 mol % MAPbCl₃. The team demonstrated that the fabrication route is suitable for tandem solar cells without phase segregation. 

The researchers successfully fabricated a triple-halide perovskite film with top cell optimized bandgaps, high PL quantum yield (PLQY), and improved film quality using the slot-die coating method. They have also efficiently integrated halide perovskites with industrial silicon bottom cells in a tandem architecture, demonstrating the potential of fabricating industrially relevant and scalable perovskite solar cells.