You are here

Graphene-perovskite large area solar cell achieves record efficiency

Mar 07, 2017

Researchers at the Centre for Hybrid and Organic Solar Energy (CHOSE) of the University of Rome “Tor Vergata”, along with researchers at the Italian Institute of Technology (IIT) and the University of Applied Sciences in Crete (TEI), have stated that they set a new record for conversion efficiency of a perovskite photovoltaic module with an area larger than 50 cm2.

Perovskite-graphene large area solar cell with record efficiency image

The success was achieved as part of Graphene Flagship, the 1 billion euro European project that promotes graphene-based innovation in sectors like energy, electronics, technology and medicine. Perovskites photovoltaic modules' efficiency is usually demonstrated in the laboratory on cells less than 1 cm2 in size, whereas the new test was performed on modules with an area larger than 50 cm2. The electronic and chemical properties offered by graphene have made it possible to overcome the many difficulties related to the realization of large-area perovskite solar panels.

Exeter team designs a novel method of engineering computer chips using graphene oxide

Mar 05, 2017

Researchers from the University of Exeter have developed a method using graphene oxide flakes that could be used to create the next generation of computers. The Exeter team used microfluidics technology to develop a new method of engineering computer chips that’s easier and less expensive than the current methodology.

The microfluidics approach uses minute channels to control the flow and direction of tiny quantities of fluid. The tests performed at the University of Exeter involved flakes of graphene oxide, mixed into the fluid, which was then mixed together in the channels to create the chips. The researchers used an advanced light-based procedure to facilitate the creation of three-dimensional structures that comprise the resulting chip.

Researchers use graphene oxide to design a low-cost system that captures cells efficiently

Mar 05, 2017

Researchers at MIT and National Chiao Tung University have designed a graphene oxide-based system that could make it possible to capture and analyze individual cells from a small sample of blood, potentially leading to very low-cost diagnostic systems that could be used almost anywhere.

Graphene oxide captures cells image

The new system, based on specially treated sheets of graphene oxide. The team explains that the key to the new process is heating the graphene oxide at relatively mild temperatures. This low-temperature annealing makes it possible to bond particular compounds to the material's surface. These compounds in turn select and bond with specific molecules of interest, including DNA and proteins, or even whole cells. Once captured, those molecules or cells can then be subjected to a variety of tests.

Zenyatta Ventures' graphite successfully turned into graphene oxide for sensing applications

Mar 02, 2017

Zenyatta logo imageZenyatta Ventures has announced that a team of scientists at Lakehead University in Canada has made significant progress in developing sensing applications with the first graphene oxide (GO) produced from the Company’s Albany graphite.

The team has developed a novel one-pot synthesis of fluorine functionalized graphene oxide (F-GO) which can be used in many energy, environmental and electrochemical sensing applications. The produced F-GO has been tested for the simultaneous detection of various toxic metal ions (e.g. mercury, lead, cadmium and copper) and a substantial improvement in the electrochemical sensing performance was achieved in comparison with GO.

Graphene to enable an artificial throat able to generate and detect sound

Mar 01, 2017

Researchers at the China-based Tsinghua University have designed an intelligent artificial throat device using laser-induced graphene that can generate and detect sound. Many technologies have been developed to help vocally-impaired people, but most rely on alternatives to speech instead of actual vocal expression. These are also quite expensive and complex. The researchers in this study have developed a one-step process to fabricate a low-cost and wearable LIG artificial throat, that exhibits a high performance for both generating and detecting sounds. It is the LIG within the device, which possesses fantastic thermoacoustic and piezoresistive properties, that enables the functional integration of emitting and detection within a single device.

Graphene-based artificial throat image

As a sound source, the device can generate a wide-band sound source with a frequency of 100 Hz to 40 kHz. The device also has a broad frequency spectrum due to resonance-free oscillations from the sound sources. As a detector, the artificial throat device shows a unique response towards different kinds of sounds and throat vibrations. The device can recognize vocal activities such as coughing, humming and screaming at different tones and volumes, through the mechanical vibrations of the throat cords with fine repetition. This recognition is performed with clear distinction due to the differentiation of their specific waveforms. It also has the capability to recognize words and sentences. The different volumes and/or frequencies can be transformed into controllable and pre-designed sounds. The excellent mechanical properties of the device also allow the device to be capable of voice recognition.