All articles tagged with #organic semiconductors
Researchers from Ritsumeikan University and collaborators have developed a novel antiaromatic π-stacking system using NiII-coordinated norcorroles with aliphatic side chains, leading to the formation of highly conductive liquid crystals. This breakthrough could significantly advance the design of organic semiconductors and electronic devices.
Physicists at Umeå University, in collaboration with researchers in Denmark and China, have discovered a sustainable alternative to producing organic semiconductors for optoelectronics. By pressure-cooking birch leaves, they have produced nanosized carbon particles with desired optical properties. These "carbon dots" emit a narrow-band, deep red light and have comparable properties to commercial quantum dots used in semiconductor materials, but without heavy metals or critical raw materials. The researchers demonstrated the potential of these carbon dots in light-emitting electrochemical cell devices, showing comparable brightness to a computer screen. This method of utilizing biomass as a raw material for organic semiconductors offers a more sustainable approach to meet the increasing demand for optoelectronic technologies.
Researchers have made significant progress in controlling the doping of molecular semiconductors through proton-coupled electron transfer, a process inspired by biological systems. By manipulating the exchange of protons and electrons, scientists have achieved efficient molecular doping of polymeric semiconductors, enhancing their charge conductivities and thermoelectric power factors. This breakthrough opens up new possibilities for the development of high-performance organic electronic devices.
Researchers have recorded an ultrafast movie of the photon-to-electricity conversion process in pentacene, a molecular material that shows conversion of one photon into four charges, instead of the usual two. This excitation doubling, called exciton fission, could be extremely useful for high-efficiency photovoltaics. The researchers used time- and angle-resolved photoemission spectroscopy to observe the dynamics of electrons on the femtosecond time scale, which is a billionth of a millionth of a second, and captured images of the fleeting excited electrons for the first time. They identified the mechanism of the free charge carrier-doubling process, which is crucial for the use of organic semiconductors in innovative photovoltaic applications and to further boost the conversion efficiency of today's solar-cells.