Researchers develop artificial retinas with microcavity perovskite photoreceptors

Researchers at the National Tsing Hua University in Taiwan, led by Professor Hao-Wu Lin, have demonstrated that high-performance filter-less artificial human photoreceptors can be realized by integrating a novel optical metal/dielectric/metal microcavity structure with vacuum-deposited perovskite photoresponse devices.

Schematic and cross-sectional SEM image of the photoreceptor with an inverted structure image

Sensory substitution with flexible electronics is one of the intriguing fields of research. Scientists already fabricate electronic devices that can replicate, to a certain degree degree, some of the human senses – touch (electronic skin – e-skin), smell (e-nose), and taste (e-tongue). E-versions of the eye's photoreceptors (e-retinas) could potentially be used in a wide range of applications from robotic humanoid vision to artificial retina implantation for vision restoration or even vision extension into a wider range of wavelength.

Indian researchers develop a perovskite-based device that detects heart attacks

Researchers from the Indian Institute of Technology (IIT) Hyderabad, India, have fabricated a perovskite-based low-cost, ultra-sensitive device that is capable of detecting the cardiac biomarker troponin T protein. Troponin T is a cardiac protein that is released into the bloodstream after a heart attack.

Unlike the commercially available test that can detect the protein at nanogram per ml concentration, this device can reportedly detect the protein at an extremely low concentration of femto gram per ml. This could help pave the way for early diagnosis of a heart attack, increasing a patient’s survival rate. It even has the potential to be able to predict the onset of a heart attack.

NUS team harnesses the properties of 2D perovskites for ultrathin optoelectronic applications

NUS scientists have found that the light emission properties of molecularly thin two-dimensional (2-D) hybrid perovskite can be tuned in a highly reversible way for ultrathin optoelectronic applications. A highly efficient photodetector has been fabricated using hybrid perovskites with the thickness of a single quantum well.

Molecularly thin hybrid perovskite for advanced optoelectronic applications imageAn impression of laser interaction with a molecularly thin 2D perovskites encapsulated by hexagonal boron nitride (blue layer). (Image: NUS)

Each basic unit of a 2D hybrid perovskite is constructed using a semiconducting layer of inorganic material sandwiched between two organic insulating layers. While researchers have studied layered perovskites in their bulk form for many years, the properties of these crystals when their thickness is thinned down to a few and single layers have largely not been explored.

Perovskites show promise as low-cost and efficient photodetectors that transfer both text and music

Researchers at Linköping University and Shenzhen University have shown how inorganic perovskites can be used to produce low-cost and efficient photodetectors that transfer both text and music. "It's a promising material for future rapid optical communication," says Feng Gao, researcher at Linköping University.

Perovskites show promise as low-cost and efficient photodetectors that transfer both text and music image

"Perovskites of inorganic materials have a huge potential to influence the development of optical communication. These materials have rapid response times, are simple to manufacture, and are extremely stable." says Feng Gao.

Researchers develop ultrasensitive photodetectors based on 2D perovskite nanowires

Researchers at the Technical Institute of Physics and Chemistry (TIPC) in China, together with research groups at Tianjin University and the University of California, have realized the fabrication of high-quality two-dimensional perovskite nanowire arrays, which exhibit ultra-sensitive photodetection.

Sensitive perovskite photodetectors image

Through controlling the dewetting dynamics on the asymmetric-wettability topographical interface, the researchers have realized the controllable growth of single-crystalline 2D-perovskite nanowires. These nanowires are self-organized layer-by-layer into quantum wells with alternating conductive perovskite layers and insulating organic cations.