Perovskite-Info: the perovskite experts

Perovskite-Info is a news hub and knowledge center born out of keen interest in the wide range of perovskite materials.

Perovskites are a class of materials that share a similar structure, which display a myriad of exciting properties like superconductivity, magnetoresistance and more. These easily synthesized materials are considered the future of solar cells, as their distinctive structure makes them perfect for enabling low-cost, efficient photovoltaics. They are also predicted to play a role in next-gen electric vehicle batteries, sensors, lasers and much more.

Recent perovskite News

Korean team uses a transparent conductive adhesive to combine perovskite and silicon solar cells

Researchers from the Ulsan Institute of Science and Technology (UNIST) have demonstrated a new method of fabricating perovskite-on-silicon tandem devices, using a transparent conductive adhesive (TCA) to combine the two cells. The scientists have developed devices with demonstrated efficiencies of 19.4%, and propose methods to bring that up to over 24% using existing technology.

While the efficiency is still well below the 28% record for a perovskite/silicon tandem cell set by Oxford PV, the UNIST group says its method is far simpler to manufacture than previous concepts. “It is meaningful to develop an attached tandem solar cell unlike the conventional tandem solar cell with stacked structure,” said UNIST’s In Young Choi, lead author of the study. “We have observed that the TCA effectively connects the different light-absorbing layers.”

HZB researchers reach 23.26% record efficiency for tandem perovskite-CIGS solar cell

A team led by Prof. Steve Albrecht from the HZB has announced a new world-record: a tandem solar cell with certified efficiency of 23.26% that combines the semiconducting materials perovskite and CIGS. One reason for this success lies in the cell’s intermediate layer of organic molecules: they self-organize to cover even rough semiconductor surfaces. Two patents have been filed for these layers.

World record for tandem perovskite-CIGS solar cell image

Perovskite-based solar cells have experienced an incredibly rapid increase in efficiency over the last ten years. The combination of perovskites with classical semiconductor materials such as silicon and copper-indium-gallium-selenide (CIGS) compounds in tandem solar cells promises low-cost, high-performance solar modules for the future. However, losses at the electrodes between the two semiconductors considerably reduce the efficiency.

Flexible tandem perovskite/CIGS solar cells with 23% conversion efficiency reported by Solliance and MiaSolé

Solliance and U.S-based MiaSolé announced a new record - power conversion efficiency of 23% on a flexible tandem solar cell: a top flexible semi-transparent perovskite solar cell with a bottom flexible copper indium gallium selenide (CIGS) cell.

Solliance and Miasole's 23%efficiency tandem perovskite/CIGS cells image

This achievement comes only 9 months after the January 2019 announcement by Solliance and MiaSolé regarding a flexible solar cell with an impressive power conversion efficiency of 21.5%. The solar cell, similarly to this newly announced one, combined two thin-film solar cell technologies into a 4 terminal tandem solar cell stack: a top flexible semi-transparent perovskite solar cell with a bottom flexible copper indium gallium selenide (CIGS) cell.

Researchers find environmental impacts on organometal halide perovskites

Researchers from the University of Tennessee and Oak Ridge National Laboratory have found that the environment is a non-trivial component in the operation of organometal halide perovskite (OMHP) devices, playing an important role in the charge transport behavior at the electrode/crystal interface of OMHPs due to coupling between surface mediated redox processes and bulk ionic species.

Environment factors impact transport and stability in OMHPs and but offer new opportunities in sensing and energy storage image

The team explored environmental and interface effects, namely transport behavior and origins of the gas sensitivity, in MAPbBr3 single crystal (SC) devices using impedance spectroscopy and G-Mode Kelvin Probe Force Microscopy (G-KPFM). Strong resistive response was found to occur when the crystals were exposed to different environments. It was shown, among other things, that SC response to the environment is extremely different at the surface as compared to the bulk due to the disorder surface chemistry.

Korean scientists develop graphene electrode to enable next-gen perovskite solar cells

Several research institutions in South Korea are actively conducting research and development on next-generation solar cells, heightening expectations for commercialization. The research team led by Prof. Yoon Soon-gil of Chungnam National University has developed a new graphene electrode to produce perovskite solar cells at a low temperature. In addition, the team led by Prof. Choi Kyoung-jin of the School of Materials Science and Engineering at UNIST has developed a new concept tandem solar cell using transparent conductive adhesives (TCA).

The graphene electrode developed by Professor Yoon’s team can help create a perovskite solar cell at a low temperature and can raise both safety and economic efficiency.

Researchers design an ecofriendly and low-cost method for fabricating high performance perovskite photodetectors

Perovskites have shown potential for use as high performance photodetectors, where the responsivity and detectivity of the perovskite photodetector (PePDs) can be improved by engineering its interfacial properties. Researchers from the University of Electronic Science and Technology of China (UESTC) and City University of Hong Kong have reported the applications of bio-inspired materials, deoxyribonucleic acid (DNA) and guanine, as functional interfacial layers for high performance PePDs.

The schematic diagram of the PePD image

The best bio-material modified PePDs exhibit a ∼2× enhancement of the photo-current than that of the reference PePDs with no modifications. Further optimization of the thickness for the bio-materials based functional layers enables the PePD to achieve a remarkable responsivity of 0.37 A W−1 and detectivity of 1.85 × 1012 Jones at the wavelength of 745 nm.

New "Capitano" project aims to develop CIGS-perovskite tandem cells

German university the Karlsruhe Institute of Technology (KIT), the Center for Solar Energy and Hydrogen Research Baden-Würtetemburg (ZSW) and CIGS module manufacturer Nice Solar Energy have announced an ambition to design tandem PV modules based on CIGS and perovskite, which can theoretically achieve efficiencies well above 30%.

The joint ‘Capitano’ project will run for three years and has received more than €5 million from Germany’s Federal Ministry for Economic Affairs and Energy. The aim of the project is to develop cells with stable higher efficiencies, which can be interconnected to form efficient tandem solar modules.