Boosting the Performance of Organic Photodetectors with a Solution‐Processed Integration Circuit toward Ubiquitous Health Monitoring

Abstract

Organic photodetectors, as an emerging wearable photoplethysmographic (PPG) technology, offer exciting opportunities for next‐generation photonic healthcare electronics. However, the mutual restraints among photoresponse, structure complexity, and fabrication cost have intrinsically limited the development of organic photodetectors for ubiquitous health monitoring in daily activities. Here, an effective route to dramatically boost the performance of organic photodetectors with a solution‐processed integration circuit for health monitoring application is reported. Through creating an ideal metal–semiconductor junction interface that minimizes the trap states within the device, solution‐printed organic field‐effect transistors (OFETs) are achieved with an ultrahigh signal amplification efficiency of 37.1 S A−1, approaching the theoretical thermionic limit. Consequently, monolithic integration of the OFET with an organic photoconductor enables the remarkable amplification of photoresponse signal‐to‐noise ratio by more than four orders of magnitude from 5.5 to 4.6 × 105, which is able to meet the demand for accurately extracting physiological information from the PPG waveforms. This work offers an effective and versatile approach to greatly enhance the photodetector performance, promising to revolutionize health monitoring technologies.

Lateral Homoepitaxy Growth of Organic Single-Crystal Arrays for Large-Scale and High-Performance Organic Field-Effect Transistors

“…Thus, the deep trap density per eV is less than 1 in 10 8 molecules. Furthermore, the D bulk max of only 2.8 × 10 17 cm –3 eV –1 compares very favorably with that of the previously reported organic single crystals, − ,− where D bulk max is in the range of 1.9 × 10 18 ∼ 4.0 × 10 20 cm –3 eV –1 , indicating extraordinarily high quality of the C 8 –BTBT single crystals. Given the above, we can attribute the enhanced mobility and performance uniformity to the a -axis orientation of the C 8 –BTBT SCA, pure crystal alignment, and high crystal quality enabled by our lateral homoepitaxy growth strategy.…”

Recent advances in fabrication and functions of neuromorphic system based on organic field effect transistor

“…Moreover, organic materials can adjust their optoelectronic properties through the design or modification of organic molecules, which are suitable for sensing and responding to light. Furthermore, the organic field effect transistor (OFET) can be used for flexible electronic devices by solution-processable fabrication techniques, such as roll-to-roll coating, screen printing, and inkjet printing [38][39][40]. Therefore, the OFET device is a promising component for future neuromorphic systems.…”

Plasmon-enhanced photoresponse and stability of a CsPbBr3 microwire/GaN heterojunction photodetector with surface-modified Ag nanoparticles

“…Having controllable band structure, and excellent optical/electrical characteristics, the combination of inorganic semiconductors can be used to construct outstanding performance perovskite heterostructure optoelectronic devices, which are expected to be of use in practical applications. 15,[36][37][38] Thus, combining the advantages of inorganic semiconductor materials would make as-proposed perovskite heterojunction optoelectronics devices technically and practically competitive. To date, great efforts have been contributed to optimizing device properties, including surface/ interface passivation, embedding with high mobility materials, etc.…”