Organometal halide perovskite imager: a comparison 1.5 years after fabrication

Future medical X-ray imaging will benefit from advances in computing power and artificial intelligence as well as improvements in the X-ray detector performance itself. Hybrid inorganic-organic perovskite materials promise direct conversion detectors with higher image quality, owing to their strong X-ray absorption, high electron and hole...

Active-matrix mesh electronics thin-film-transistor arrays for biometrics-under-display and biomedical applications

A monolithic manufacturing process is presented for the realization of active-matrix meshed thin-film-transistor (TFT) arrays on foil with physical voids between pixels, realizing membrane-like electronic arrays. The process is scalable to large-area substrates and enables (improved performance of) biometrics-under-display applications. Moreover...

Integration of large-area optical imagers for biometric recognition and touch in displays

In recent years there is an increasing interest to integrate optical sensing in mobile displays, for instance, for biometric fingerprint scanning functionality. There are several routes to incorporate optical fingerprint functionality within the full display area, each with their own benefits and challenges. Here we investigate the different...

High-sensitivity high-resolution X-ray imaging with soft-sintered metal halide perovskites

To realize the potential of artificial intelligence in medical imaging, improvements in imaging capabilities are required, as well as advances in computing power and algorithms. Hybrid inorganic–organic metal halide perovskites, such as methylammonium lead triiodide (MAPbI3), offer strong X-ray absorption, high carrier mobilities (μ) and long...

Characterization with X-rays of a large-area GEMPix detector with optical readout for QA in hadron therapy

Quality Assurance (QA) in hadron therapy is crucial to ensure safe and accurate dose delivery to patients. This can be achieved with fast, reliable and high-resolution detectors. In this paper, we present a novel solution that combines a triple Gas Electron Multiplier (GEM) and a highly pixelated readout based on a matrix of organic photodiodes...

Vein detection with near-infrared organic photodetectors for biometric authentication

We combine a low dark current and high-detectivity near-infrared (NIR)-sensitive organic photodetector with a high-resolution 508 pixels per inch (ppi) oxide thin-film transistor (TFT) backplane to create a large-area thin NIR detector, using processes that are compatible with flat-panel display fabrication. The detector is characterized showing...

High-Accuracy Photoplethysmography Array Using Near-Infrared Organic Photodiodes with Ultralow Dark Current

Reflectance oximeters based on organic photodiode (OPD) arrays offer the potential to map blood pulsation and oxygenation via photoplethysmography (PPG) over a large area and beyond the traditional sensing locations. Here, an organic reflectance PPG array based on 16 × 16 OPD pixels is developed. The individual pixels exhibit near-infrared...

A High-Resolution Thin-Film Fingerprint Sensor Using a Printed Organic Photodetector

Organic photodetectors (OPDs) have attracted much attention in recent years, due to their promise in large-area light sensing applications. Here, high-resolution slot-die-coated large-area bulk heterojunction organic photodiode (OPD) arrays are reported. The OPD uses a novel electron transport layer, indium gallium zinc oxide in combination with...

Printed Organic Photodetector Arrays and their use in Palmprint Scanners

Using flat-panel compatible processes we realized 6x8 cm, 200-ppi active-matrix imagers with solution-processed, ultrathin organic photodiodes and demonstrate its performance in a biometric palmprint detector.