Tang Ying

Bio: Tang Ying is an academic researcher from China Jiliang University. The author has contributed to research in topics: Layer (electronics) & Organic field-effect transistor. The author has an hindex of 7, co-authored 43 publications receiving 183 citations.

Insight into trap state dynamics for exploiting current multiplication in organic photodetectors

Abstract: Trap-induced current multiplication has received tremendous attention in organic photodetectors because it is not required for a pre-amplifier circuit to read weak photocurrent signals. However, a plausible correlation between energy-distinguishable trap states and device performance has not been established for guiding the device design, a task that remains a significant challenge. Here, we propose an ingenious strategy to demonstrate current multiplication by engineering an ultrathin fullerene (C-60) film as hole trap or barrier layer, which illustrates trap-state dynamics through systematical investigations on device current fluctuations in darkness and illumination conditions. The comparison of trap-dependent performances between experimental and control devices clearly shows that the traps play a critical role in generating the multiplication effect. And shallow trap states are estimated to be more favorable for improving the device restorability. Thus, we anticipate that trap engineering, by selectively passivating deep traps whilst retaining shallow ones, will be a fruitful approach for further research, leading to high-performance photodetectors with superior current multiplication and temporal response. (C) 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

High-performance organic broadband photomemory transistors exhibiting remarkable UV-NIR response

Abstract: The electrical and optical properties of organic semiconductors have improved rapidly in recent years, rendering them highly promising for various optoelectronic applications owing to low-cost and lightweight potential in combination with spectral tunability and long photocarrier lifetimes. Organic photomemory has emerged as an innovative application to achieve optical data storage. However, practical operation requires universal device design with broader spectral response in terms of related materials, interfaces and architecture, a task that remains a significant challenge. Herein, we present a universal strategy to fabricate organic broadband photomemories featuring remarkable UV-NIR response, thereby providing optical switching ability with a controllable memory window. To the best of our knowledge, this study demonstrates an excellent performance with the broadest response spectra and the highest photomemory efficiency of up to 593%. We systematically study the charge trapping mechanism and photoinduced injection enhancement by combining an energy level model with theoretical calculations, characterizing conceivable photogenerated minority carrier trapping and accumulation kinetics. Thus, it is anticipated that the proposed approach will be a starting point for further research, resulting in high-performance organic photomemory ideal for digital commutation between optical and electric signals.

I and i

Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

Recent progress on highly sensitive perovskite photodetectors

Abstract: Perovskite photodetectors (PPDs), which combine the advantages of perovskite semiconductor materials with superior optical and electronic properties and solution-processed manufacturing, have emerged as a new class of revolutionary optoelectronic devices with potential for various practical applications. Encouraged by the development of various solution-synthesis and film-deposition techniques for controlling the morphology and composition of perovskite materials with interesting optoelectronic properties, increasing research attention is focused on the development of high performance PPDs. In this review, the recent progress on emerging PPDs is comprehensively summarized from the perspective of device physics and materials science. The strategies for extending the spectral response range of PPDs and improving the performance of devices are investigated. Furthermore, the methods for realizing narrowband photodetectors are also discussed, where filter-free and self-filter narrowband PPDs are achieved based on the concept of charge collection narrowing. Meanwhile, the promising future directions in this research field are proposed and discussed, including multifunctional PPDs, perovskite–organic hybrid photodetectors, flexible and transparent PPDs, self-powered PPDs, and photodetector systems and arrays. This review provides valuable insights into the current status of highly sensitive PPDs and will spur the design of new structures and devices to further enhance their photo-detection performances and meet the need of versatility in practical application.

Synthesis and applications of graphene quantum dots: a review

Abstract: Abstract As a new class of fluorescent carbon materials, graphene quantum dots (GQDs) have attracted tremendous attention due to their outstanding properties and potential applications in biological, optoelectronic, and energy-related fields. Herein, top-down and bottom-up strategies for the fabrication of GQDs, mainly containing oxidative cleavage, the hydrothermal or solvothermal method, the ultrasonic-assisted or microwave-assisted process, electrochemical oxidation, controllable synthesis, and carbonization from small molecules or polymers, are discussed. Different methods are presented in order to study their characteristics and their influence on the final properties of the GQDs. The respective advantages and disadvantages of the methods are introduced. With regard to some important or novel methods, the mechanisms are proposed for reference. Moreover, recent exciting progresses on the applications of GQD, such as sensors, bio-imaging, drug carriers, and solar cells are highlighted. Finally, a brief outlook is given, pointing out the issues still to be settled for further development. We believe that new preparation methods and properties of GQDs will be found, and GQDs will play more important roles in novel devices and various applications.