Sensors

Researchers from China's Dongguan University of Technology and Xi'an Jiaotong University have developed a spontaneous cooling strategy with a hot-pressing technique that enables the production of high-purity, wafer-scale, pinhole-free perovskite wafers with a reflective surface. 

This method can, according to the team, be extended to a variety of perovskite wafers, including organic-inorganic, 2D, and lead-free perovskites. The size of the wafer (with diameters of 10, 15, and 20 mm) can be tailored by changing the mold.

An NSW Smart Sensing Network Grand Challenge Fund project is hoping to eliminate the reliance of sensors on disposable batteries by testing the fast production of perovskite photovoltaic (PV) cells, in the hope of creating a more sustainable sensor power source. The NSW Smart Sensing Network, a consortium of eight leading universities across NSW and the ACT, is a not-for-profit innovation network that brings together universities, industry and government to translate world-class research into innovative smart sensing solutions that create value for NSW and beyond.

The Revolutionizing Indoor Sensor Power: Rapid Microwave Annealing for Ultra-low-cost Perovskite Solar Cells project is being led by Dr. Binesh Veettil, a Senior Lecturer in the School of Engineering at Macquarie University. “Perovskite cells offer continuous power, and are ideal for harvesting indoor light to power low-power sensors,” Dr. Veettil says. “They are cost-effective when mass manufactured and they are suitable for roll-to-roll manufacturing as they can be screen-printed, slot-die coated, or spray-painted. Unfortunately the lengthy annealing time required is a challenge to be addressed to enable their widespread adoption.”

Interface engineering is widely used to enhance the efficiency and stability of photodetectors (PDs). Researchers from China's Guangxi University have explained that although fluorine-containing materials are ideal for interface modification, they are seldom used at the NiOx/perovskite interface. Their recent paper reports on the use of Tris(pentafluorophenyl)borane (BCF) and 2,3,5,6-tetrafluoro-7,7,8,8- tetracyanoquinodimethane (F4-TCNQ)-modified NiOx HTL to achieve high-efficiency and high-stability PDs. 

This work shows that BCF and F4-TCNQ interact to provide better doping ability, form Lewis adducts with Pb²⁺, and enhance the crystallinity of their perovskites. Interaction with nickel oxide optimizes the Ni³⁺/Ni²⁺ ratio, thus improving conductivity and charge transport capability. The F4-TCNQ:BCF modification effectively reduces interface defects, improves carrier mobility, and enhances both the performance and stability of PDs in ambient air. 

Researchers from Queen Mary University of London and QinetiQ could pave the way for faster discovery of novel perovskite materials with desirable properties for applications in wireless communication and biosensors. The recent research introduces an automated platform for rapid sintering and dielectric characterization of perovskite solid solutions. This innovative approach integrates machine learning (ML) for material screening with robotic synthesis and high-throughput characterization.

The scientists stated that while accelerating perovskite solid solution discovery and sustainable synthesis is crucial for addressing challenges in wireless communication and biosensors, the vast array of chemical compositions and their dependence on factors such as crystal structure and sintering temperature require time-consuming manual processes. To overcome these constraints, they introduced an automated materials discovery approach encompassing machine learning (ML) assisted material screening, robotic synthesis, and high-throughput characterization. 

Researchers from China's Shaanxi Normal University, Zhejiang Normal University, China Institute of Radiation Protection and Chinese Academy of Sciences have developed lead-free photoferroelectric hybrid metal halide perovskite flexible membranes for wearable detectors, that offer excellent X-ray response with high sensitivities, low detection limit and impressive imaging capabilities. 

Demonstration and application potential for lead-free photoferroelectric perovskite membrane (LFPPM). a) Optical images of the LFPPM. b) Schematic diagram of LFPPM wearable X-ray dosimeter. c) Schematic diagram of the working principle of wearable X-ray dosimeter. (Image credit: Nanowerk)

High-sensitivity wearable radiation detectors are important for personnel protection in radiation environments such as defense, nuclear facilities, and medical fields. Traditional detectors using bulk crystals tend to lack flexibility. Hybrid metal halide perovskites have shown promise for next-generation radiation detection as they can efficiently absorb high-energy radiation and convert it into electrical signals. However, there are concerns of lead toxicity. More recent efforts have explored lead-free alternatives, but these have generally suffered from poor charge transport properties, reducing their effectiveness as radiation detectors.

Researchers from Gwangju Institute of Science and Technology (GIST) and Institute for Basic Science (IBS) have developed a perovskite-based camera, inspired by the structures and functions of birds' eyes, specializing in object detection. 

Schematic illustration showing the visual ecology of birds. Image from Science Robotics

The eyes of different organisms in the natural world have evolved and been optimized to suit their habitat and the environment in which they survive. As a result of countless years of evolutionary adaptation to the environment of living and flying at high altitudes, bird eyes also have unique structures and visual functions. In the retina of an animal's eye, there is a small pit called the fovea that refracts the light entering the eye. Unlike the shallow foveae found in human eyes, bird eyes have deep central foveae, which refract the incoming light to a large extent. The region of the highest cone density lies within the foveae, allowing the birds to clearly perceive distant objects through magnification. This specialized vision is known as foveated vision.

Empa and ETH Zurich researchers are working to develop image sensors made of perovskite that could deliver true-color photos even in poor lighting conditions. Unlike conventional image sensors, where the pixels for red, green and blue lie next to each other in a grid, perovskite pixels can be stacked, thus greatly increasing the amount of light each individual pixel can capture.

A consortium comprising Maksym Kovalenko from Empa's Thin Films and Photovoltaics laboratory, Ivan Shorubalko from Empa's Transport at Nanoscale Interfaces laboratory, as well as ETH Zurich researchers Taekwang Jang and Sergii Yakunin, is working on an image sensor made of perovskite capable of capturing considerably more light than its silicon counterpart. 

Researchers at China's Nanjing University of Science and Technology, Hong Kong Baptist University and Southwest University have introduced a tandem device that incorporates an organic photodiode (OPD) and a perovskite light emitting diode (PeLED), enabling simultaneous light detection and emission in one compact device, prepared by all-solution fabrication process. 

The team found that precise control of interfacial properties plays a critical role in establishing the all-solution processed OPD/PeLED multi-layered dual-function device which is critical for charge transport, recombination, and generation. 

Halide perovskite single crystals such as MAPbBr₃ or CsPbBr₃ possess properties that make them particularly interesting for the detection of ionizing radiation. The most important of these are their high stopping power for absorbing gamma rays, their low-dark current and effective-charge-transport capability. They are therefore ideal for efficiently producing charges when gamma rays pass through them, which is a basic function required for their use in a detection device.

KEP Technologies, through its Setsafe brand, is developing prototype-level radiation detection devices that incorporate halide perovskite single crystals and that can trigger an alarm based on various criteria. These devices target applications for defense and public protection against nuclear and radiological risks.

Macnica, a Technology Solutions Partner that provides products, services, and solutions, has announced a new type of air quality sensor that uses perovskite solar cells and semi-solid batteries. The sensor uses perovskite solar cells from EneCoat Technologies, a startup from Kyoto University.

It was reported that for several years, an indoor perovskite solar cell effectiveness demonstration project has been taking place in the company's office in Tokyo. Through this demonstration project, it was reportedly demonstrated that the technology can become a sustainable energy source in the future, including use under low illumination, and data on various issues was gathered toward the practical application of perovskite solar cells.