Researchers achieve 18.4% efficiency for 4T flexible perovskite-CIGS tandem mini-module

Researchers from Switzerland's Federal Laboratories for Materials Science and Technology (EMPA) and École Polytechnique Fédérale de Lausanne (EPFL) have designed a four-terminal tandem mini-module based on perovskite and copper, indium, gallium and selenium (CIGS) with an aperture area of around 2 cm2, and a geometric fill factor of over 93%.

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Processing sequence of flexible NIR-transparent perovskite mini-module

Processing sequence of flexible NIR-transparent perovskite mini-module. Image from RRL Solar

The team reports that the key to efficient flexible perovskite-CIGS tandem modules is the development of near-infrared (NIR) transparent perovskite solar modules on a flexible polymer foil. To achieve these results, the researchers had to overcome the challenges of laser patterning on flexible substrates to realize the first all-laser scribed monolithically interconnected NIR-transparent perovskite mini-modules on polymer film. The perovskite mini-module used in the tandem panel was fabricated on a flexible polyethylene napthalathe (PEN) substrate mounted to a glass substrate in a p–i–n device architecture. This configuration, according to the research team, shows reduced absorption in the NIR region.

Read the full story Posted: Jul 23,2022

Researchers reach 16.5% efficiency with p-i-n perovskite solar cell on steel substrate

Researchers from the Eindhoven University of Technology, the Netherlands Organization for Applied Scientific Research (TNO), and Indian steel manufacturer Tata Steel recently fabricated an inverted perovskite solar cell based on a polymer-coated steel substrate that can achieve a power conversion efficiency approaching that of non-inverted reference solar cells with a similar stack design.

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p–i–n Perovskite Solar Cells on Steel Substrates image

Substrate (A and B) and superstrate (C) p–i–n solar cells on glass (A and C) and steel (B). Image from ACS Publication study

The cell has a p-i-n structure and relies on nickel-plated steel coated with a polyamide-imide (PAI) planarization layer, which serves as an insulating layer. The researchers used an opaque titanium electrode covered with a thin sputtered indium tin oxide (ITO) layer to enable the binding of the phosphonic acid anchoring groups of the monolayer based on a perovskite known as 2PACz, which serves as a hole-collecting electrode.

Read the full story Posted: Jul 20,2022

Researchers achieve 23.5% efficiency for a perovskite-silicon tandem cell using a special polymeric film

Researchers from Ulsan National Institute of Science and Technology (UNIST) in South Korea and the University of Pittsburgh in the U.S have reported a power conversion efficiency of 23.5% in a perovskite-silicon tandem solar cell by applying a special textured anti-reflective coating (ARC) polymeric film.

The team prepared the multifunctional film with phosphor particles measuring 10 μm in diameter. They are able to block ultraviolet (UV) light and silicon dioxide (SiO2) nanoparticles with a diameter of 10 nm to increase the ability of a perovskite-silicon tandem solar cell to absorb visible light. The scientists explained that the phosphors increase the reflectance of the ARC film, due to their large particle size, thus causing a backward light scattering issue. This in turn is compensated by the addition of the spherical SiO2 nanoparticles.

Read the full story Posted: Jul 20,2022

DaZheng Micro-Nano Technologies announces commercialization of large flexible perovskite solar panels

A Chinese startup called DaZheng (Jiangsu) Micro-Nano Technologies has announced that it has reached mass production of large, flexible perovskite solar panels, based on technology that was initially developed by researchers in Japan.

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DaZheng commercializes large, flexible solar panels

DaZheng (Jiangsu) Micro-Nano Technologies reportedly invested 80 million yuan (around USD$11.85 million) to build a production line with an annual capacity of 10 megawatts in Jiangsu Province. The 40 cm by 60 cm panels will be cut into smaller pieces and shipped to smartphone and tablet makers in China.

Read the full story Posted: Jul 19,2022

Researchers design flexible X-Ray detectors based on molecular perovskites

Researchers from China's University of Science and Technology of China (USTC) and Shaanxi Normal University have synthesized a new molecular perovskite, DABCO-CsBr3 (DABCO = N,N′-diazabicyclo[2.2.2]octonium), for use in flexible X-ray detectors. The material was prepared from DABCO, CsBr, and HBr in aqueous solution and obtained in the form of colorless crystals.

The team found that DABCO-CsBr3 possesses good mechanical properties for use in flexible devices. Compared with the metal-free equivalent DABCO-NH4Br3, DABCO-CsBr3 has a stronger X-ray attenuation capability. The researchers built a flexible X-ray detector, using a poly(vinylidene fluoride) (PVDF) polymer matrix that was mixed with DABCO-CsBr3 to create a composite film. This film shows a linear relationship between the X-ray-induced current density and the X-ray dose rate. According to the team, the material could have applications in X-ray security screening systems or medical diagnostics.

Read the full story Posted: Jul 19,2022

TubeSolar and ZSW reach milestone on the way to industrializing flexible perovskite solar cells

TubeSolar, together with the Centre for Solar Energy and Hydrogen Research Baden-Württemberg (ZSW), has reached an important milestone on the way to industrial production of its novel photovoltaic technology: an efficiency record of 14% was achieved on solar films in the industrially suitable "roll-to-roll" process. This was achieved as part of TubeSolar's perovskite research activities. 

In the process, the partners deposited all layers - with the exception of the front and rear contacts - using slot die. The speed of the coating process was over one metre per minute. The combination of this industrially suitable, fast production process and the high efficiency was referred to as 'groundbreaking' by the Companies. The flexible solar cells are used for the production of tubular photovoltaic modules, which can be used in agri-photovoltaics, among other applications.

Read the full story Posted: Jul 18,2022

Researchers develop strain relaxation approach to improve the stability of quasi-2D perovskite solar cells

A research team, led by Prof. Zhou Huiqiong's group from the National Center for Nanoscience and Technology (NCSNT) of the Chinese Academy of Sciences (CAS), has developed a strain relaxation strategy to study the effect of residual strain on properties of quasi-two-dimensional (2D) perovskites. 

The introduction of hydrophobic spacer cations makes quasi-2D perovskites more stable compared with traditional 3D perovskites, but the stability of perovskites remains unsatisfactory. Residual strain is closely related to the crystallographic properties, which in turn can significantly affect the photovoltaic properties and stability of perovskites. The research team investigated the residual strain in quasi-2D perovskite with mixed spacer cations by X-ray diffraction (XRD) and atomic force microscope (AFM). They found that there is severe tensile strain along the out-of-plane direction in pristine perovskite film, leading to poor crystallinity and insufficient stability issues. With an appropriate composition of spacer cations, the tensile strain is effectively released.

Read the full story Posted: Jul 16,2022

The Solar Energy Research Institute of Singapore (SERIS) upgrades equipment towards industrial production of perovskite-silicon tandem solar cells

The Solar Energy Research Institute of Singapore (SERIS) at the National University of Singapore (NUS) announces that it will upgrade its "Spatial Atomic Layer Deposition" (SALD) equipment. SoLayTec and SERIS have been working closely together for over a decade in the field of silicon solar cells. Recently, SERIS stated that SoLayTec will upgrade its existing ALD system using the latest technology of SALD BV, a Dutch technology start-up, for development of scalable perovskite-silicon tandem solar cells.

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SERIS gears up perovskite solar cells for industrial tandem cell production

"Upgrading to the new SALD equipment brings us significant advantages," explains Dr. Shubham Duttagupta, Deputy Director of the Next-Generation Industrial Solar Cells & Modules Cluster at SERIS. The Dutch company SALD BV has developed a patented technology for applying precise coatings on an industrial scale that can be as thin as a single atom. An atomically thin coating, as can be achieved with the SALD technology, can make the cells significantly more robust. SERIS wants to take the leap “from lab to fab” with the new SALD machine. 

Read the full story Posted: Jul 16,2022

DOE announces $56 Million to advance U.S. solar manufacturing

The Biden-Harris Administration, through the U.S. Department of Energy (DOE), has announced new initiatives and $56 million in funding to promote innovation in solar manufacturing and recycling. The funding will aim to help make clean energy more affordable and reliable, create jobs and enhance U.S. economic growth and competitiveness. Developing more solar power, the cheapest form of new electricity supply, is key to achieving President Biden’s goal of 100% clean electricity by 2035.

The new programs that were announced are designed to drive innovation in solar technology and manufacturing, supporting opportunities for the U.S. to expand production of thin-film modules, which do not rely on foreign-dominated supply chains, as well as supporting newer technologies like perovskite solar cells.

Read the full story Posted: Jul 15,2022

Researchers develop four-terminal tandem perovskite/CIGS solar cell with 26.2% efficiency

Scientists from the University of Tokyo have reported a 26.2% power conversion efficiency for a four-terminal tandem solar cell based on perovskite and copper, indium, gallium and selenium (CIGS). The researchers said these results are a world record for such tandem solar devices and attributed the improvements to the performance of the perovskite top cell.

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Four-terminal tandem perovskite/CIGS solar cell with 26.2% efficiency

They built the 1-square-centimeter perovskite device using a transparent conductive material made of indium tin oxide (ITO), which was deposited via sputtering and without thermally evaporated Molybdenum oxides ( MoOx). “By eliminating the use of the MoOx buffer layer, we were able to develop semi-transparent PVK cells with higher durability and transmittance,” the scientists said.

Read the full story Posted: Jul 15,2022