Jung-Yao Chen

National Cheng Kung University | NCKU · Department of Photonics

Electronic devices with multiple features bring in comfort to the way we live. However, repeated use causes physical as well as chemical degradation reducing their lifetime. The self-healing ability is the most crucial property of natural systems for survival in unexpected situations and variable environments. However, this self-repair property is...

Organic electrochemical transistors (OECTs) are recognized for their ability to combine electronic and ionic transport in the channel, resulting in improved transconductance and reduced operation voltage compared to organic field‐effect transistors (OFETs). Nevertheless, the hydrophobic nature of conjugated polymers remains a hindrance to ion drift...

Room‐temperature phosphorescence (RTP) two‐dimensional (2D) organic‐inorganic hybrid perovskites (OIHPs) that possess superior stability and efficient triplet energy transfer between inorganic parts and organic cations have been seen as promising materials in optoelectronic devices. However, the development of RTP 2D OIHP‐based photomemory has not...

Phosphorescent materials have received considerable attention in organic solar cells (OSCs) due to their long emission lifetime and inhibited geminate recombination. Motivated by its particular photophysical property, herein, the spatially addressable bis(2‐benzo[b]thiophen‐2‐ylpyridine)(acetylacetonate)iridium(III) (Ir(bt)2(acac))/polystyrene‐b‐po...

Solution‐processable organic–inorganic hybrid perovskite materials have been applied to a variety of optoelectronic devices due to its long exciton lifetime and small binding energy. It has emerged as promising front‐runners for next‐generation non‐volatile flash photomemory devices. However, the effect of crystal orientation of perovskite on the p...

In-depth understanding of block copolymer (BCP) thermodynamics allows to obtain numerous self-assembled nanostructures and further extend the BCP capabilities to host additives. Therefore, different research groups have begun incorporating additives of versatile nature such as nanoparticles or electrolytes. Within BCP composite systems, additives a...

The rapid emergency of data science, information technology, and artificial intelligence (AI) relies on massive data processing with high computing efficiency and low power consumption. However, the current von‐Neumann architecture system requires high‐energy budget to process data computing and storage between central computing unit and memory. To...

Emulation of photonic synapses through photo‐recordable devices has aroused tremendous discussion owing to the low energy consumption, high parallel, and fault‐tolerance in artificial neuromorphic networks. Nonvolatile flash‐type photomemory with short photo‐programming time, long‐term storage, and linear plasticity becomes the most promising candi...

Inspired by the low energy consumption, high parallel and fault‐tolerance of visual perception system in human brain, optoelectronic devices integrated with the sensing, memory and signal processing functionalities become the candidate to emulate functions of photonic synapse. Herein, red‐light stimulated non‐volatile perovskite‐based photomemory t...

Tin perovskite solar cells (TPSCs) are rising as the most promising candidates for lead-free PSCs. However, the randomly crystallized tin halide perovskite with high concentration of defects is still the bottleneck for obtaining high efficiency. Here, we report the pretreatment of FASnI3 (formamidinium, FA) perovskite film by spin-coating a solutio...

In article number 2000764, Jung‐Yao Chen and co‐workers present ultrafast responsive non‐volatile flash photomemory through a spatially addressable perovskite/block copolymer composite film. The extremely low programming time of 5 ms and data storage capacity of over 7 bits (128 levels) in one cell can trigger practical applications in light fideli...

We report an environmentally friendly resistive switching memory device on a biodegradable Ecoflex elastomeric substrate using the nontoxic and disintegrable polyfluorene/poly(butylene succinate) (PFN/PBS) blend thin films. Via applying different processing techniques, involving spin coating, spray coating, and solution shearing, the scale of phase...

Heavy metal and other toxicant detection in natural resources like water, air, soil and food is vital for environmental safety, personal hygiene, and public health care. Abundant number of sensor has acquired its wide and pivotal role in establishing the peaceful and healthy environments. The reliable features such as detection range, response / re...

The exotic photophysical properties of organic–inorganic hybrid perovskite with long exciton lifetimes and small binding energy have appeared as promising front‐runners for next‐generation non‐volatile flash photomemory. However, the long photo‐programming time of photomemory limits its application on light‐fidelity (Li‐Fi), which requires high sto...

The appealing advantage of using electrospinning technique to improve the elastomeric properties of conjugated polymers are demonstrated in this study. It is revealed that the electrospinning process can strengthen the low-crystalline feature of the prepared nanofibers. By combining the use of a polymer with low glass transition temperature, extrem...

Herein, poly(3-hexylthiophene-2,5-diyl) (P3HT) nanofiber-based organic field-effect transistors were successfully prepared by coaxial electrospinning technique with P3HT as the core polymer and poly(methyl methacrylate) (PMMA) as the shell polymer, followed by extraction of PMMA. Three different solvents for the core polymer, including chloroform,...

We report the fabrication and optical/mechanical properties of perovskite/thermoplastic polyurethane (TPU)-based multicolor luminescent core-shell nanofibers and their large-scale fiber mats. One-step coaxial perovskite/TPU nanofibers had a high photoluminescence quantum yield value exceeding 23.3%, surpassing that of its uniaxial counterpart, due...

Stretchable fiber‐based electrodes are highly desired for the applications of wearable electronics owing to their good durability, excellent deformability, and easy attachment onto a curved surface in comparison with thin film electrodes. However, it is a critical challenge to fabricate a fiber‐based electrodes with low surface roughness and high c...

Organic-inorganic hybrid perovskite has become one of the most important photoactive materials owing to their intense light-harvesting property as well as the facile solution processability. Besides the photovoltaic applications, a novel photo-programmed transistor memory was recently developed based on the device architecture of a floating-gate tr...

We report the synthesis, morphology, and photophysical properties of new conjugated rod-coil block copolymers consisting of poly[2,7-(9,9-dihexylfluorene)] (PF) conjugated rods and soft poly(n-butyl acrylate) (PBA) coils for stretchable light-emitting device applications. The PF-b-PBA thin films could form obvious self-assembled nanofibrillar struc...

The rapid development of wearable electronic devices has prompted a strong demand to develop stretchable organic solar cells (OSCs) to serve as the advanced powering systems. However, to realize an intrinsically stretchable OSC is challenging since it requires all the constituent layers to possess certain elastic properties. It thus necessitates a...

In article number 1704379, Shih‐Huang Tung, Wen‐Chang Chen, and co‐workers demonstrate the preparation of uniform luminous perovskite nanofibers by a one‐step core/shell electrospinning technique. The luminous electrospun nanofibers possess wide color‐tunability by varying the perovskite composition. Also, the grain size of the formed perovskite na...

A one‐step core/shell electrospinning technique is exploited to fabricate uniform luminous perovskite‐based nanofibers, wherein the perovskite and the polymer are respectively employed in the core and the outer shell. Such a coaxial electrospinning technique enables the in situ formation of perovskite nanocrystals, exempting the needs of presynthes...

Stretchable light-emitting polymers are important for wearable electronics; however, the development of intrinsic stretchable light-emitting materials with great performance under large applied strain is the most critical challenge. Herein, this study demonstrates the fabrication of stretchable fluorescent poly[(9,9-bis(3'-(N,N-dimethylamino)propyl...

In recent years, the exploitation of stretchable organic solar cell (OSC) has attracted significant research interests due to the rapid progress of wearable electronics. However, the development of a stretchable OSC is quite challenging since it has a strict requirement for the mechanical deformability and durability of each constituent layer in de...

Organic–inorganic hybrid perovskite solar cells (PVSC) have appeared as promising high power-per-weight power systems for wearable electronic devices. Herein, we utilized a low-temperature electrodeposited tin oxide (SnO2) electron-transporting layer (ETL) coupled with a thin PCBM ETL and a functional encapsulating layer to realize an efficient, st...

This study describes the first perovskite-based redox resistive switching memory using CH3NH3PbBr3 nanoparticles (NPs) dispersed in an insulating solid polymer electrolyte, poly(ethylene oxide) (PEO), and scrutinizes it in detail. Herein, PEO is chosen not only to perform a matrix function due to its ionic conductivity but also to support a preserv...

Solution-processable organic-inorganic hybrid perovskite materials with a wealth of exotic semiconducting properties have appeared as the promising front-runners for next-generation electronic devices. Further, regarding its well photoresponsibility, various perovskite-based photosensing devices are prosperously developed in recent years. However,...

Tin oxide (SnO2) has recently attracted significant research interest for its role functioning as an efficient electron-transporting layer (ETL) due to its higher charge mobility than the commonly used titanium oxide (TiO2) for realizing high-performance perovskite solar cells (PVSCs). However, it is still challenging to develop a facile, low-tempe...

To address the challenges of reliablity and facile processability of a benchmark polymer PTB7-Th, one of the most prevailing donor materials utilized in organic solar cells, we have systematically investigated the correlations among chemical structure, processing, morphology and device performance. Our study reveals that the regioregularity of PTB7...

Rigid fused perylene diimide (PDI) dimers bridged with heterocycles exhibit superior photovoltaic performance compared to their unfused semiflexible analogues. Changing the chalcogen atoms in aromatic bridges gradually increases twist angles between two PDI planes, leading to varied morphology in which the one bridged by thiophene achieves a balanc...

We fabricated dual functional electrospun (ES) nanofibers by a coaxial electrospinning technique for enhancing organic photovoltaic device (OPV) efficiency, containing poly[2,7-(9,9-dihexylfluorene)-alt-4,7-(2,1,3-benzothiadiazole)](PFBT) nanoparticles as the luminescent solar concentrator (LSC) and Ag nanoparticles for the surface plasmon resonanc...

Five new poly(selenophene-thiophene), including PSe4TV, PSe4TT, PSe4T2T, PSe4TTT, and P2Se4TTT, were synthesized via Stille coupling polymerization enable various π-conjugated spacers of vinylene (V), thiophene (T), bithiophene (2T), and thieno[3,2-b]thiophene (TT). Tuneable polymer structural, optical, and electrochemical properties were observed...

A molecular nano-floating gate (NFG) of pentacene-based transistor memory devices is developed using conjugated polymer nanoparticles (CPN) as the discrete trapping sites embedded in an insulating polymer, poly (methacrylic acid) (PMAA). The nanoparticles of polyfluorene (PF) and poly(fluorene-alt-benzo[2,1,3]thiadiazole (PFBT) with average diamete...

An extra electric field is introduced below the spinneret in an electro­spinning setup for producing poly(3-hexylthiophene) (P3HT) nanofibers. The liquid jet is greatly prolonged by the additional extensional force and thinner fibers can thus be obtained. The chain conformation and orientation in fibers are probed by differential scanning calorimet...

Significant enhancement of P3HT (poly(3-hexylthiophene)):PC61BM ([6,6]-phenyl C61-butyric acid methyl ester) photovoltaic devices using different patterns of electrospun Ag/PVP composite nanofibers, including nonwoven, aligned, and crossed patterns, is reported. The composite electrospun nanofibers are prepared using in situ reduction of silver (Ag...

We prepared aligned poly(3-hexylthiophene) (P3HT) nanofibers for the application of organic field-effect transistor (OFET) by two-fluid coaxial electrospinning (ES) technique using P3HT as core and PMMA as shell, followed by extraction of PMMA. Effects of shell flow rate and thermal annealing temperature on the morphology and optoelectronic propert...