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Your search keyword '"Cheng, Horng-Long"' showing total 219 results
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219 results on '"Cheng, Horng-Long"'

1. Bacteria Contaminants Detected by Organic Inverter-Based Biosensors

Author

Fang, Po-Hsiang, primary, Chang, Han-Chun, additional, Cheng, Horng-Long, additional, Huang, Chih-Chia, additional, Wang, Shuying, additional, Teng, Ching-Hao, additional, Chia, Zi-Chun, additional, Chiang, Hai-Pang, additional, Ruan, Jrjeng, additional, Shih, Wei-An, additional, and Chou, Wei-Yang, additional

Published
2024
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6. Photocatalytic Hydrogen Evolution Enabled by Oriented Phase Interactions between Monolayers of P3HT‐Wrapped MoS2 and Ferroelectric Lamellar Crystals.

Author

Lin, Kun‐Ta, Cheng, Wen‐Hui, Cheng, Horng‐Long, Lin, Hsin‐Hui, Chou, Wei‐Yang, Hsu, Bang‐Yu, Mao, Cheng‐An, Hou, Yu‐Cyuan, and Ruan, Jrjeng

Subjects
FERROELECTRIC crystals, FERROELECTRIC polymers, CRYSTALLINE polymers, MONOMOLECULAR films, ELECTRON transitions, DIPOLE interactions, HYDROGEN evolution reactions
Abstract

Unveiled as a unique feature of polymer ferroelectric crystals, oriented coalescence within monolayers of poly(vinylidenefluoride‐co‐trifluoroethylene)(PVDF‐TrFE) ferroelectric crystals has been found regulable upon monolayer roughness, which is accompanied by the adjustment of piezoelectric responses, and thus phase polarity. Simply with the deposition of poly(3‐hexylthiophene (P3HT)‐wrapped molybdenum disulfide (MoS2) sheets, piezoelectric responses of polymer ferroelectric crystals are surprisingly enhanced further. Also dependent on the degrees of phase polarity, the binding energy of P3HT excitons declines to a level comparable to that of inorganic excitons, together with the alteration of work functions. These results suggest mutual polarization between ferroelectric lamellar crystals and originally nonpolar P3HT‐wrapped MoS2 sheets as a result of dipole‐induced dipole phase interactions. As the Fermi levels and driving forces of interfacial electron transition are also adjustable upon involved phase interactions, P3HT‐wrapped MoS2 sheets can photocatalyze hydrogen evolution with an average production rate reaching 4.474 mmol g−1 h−1, which is 1.6 times higher than the results without the aid of phase interactions. Accordingly, amplifying phase interactions has been elucidated feasible, and able to serve as a promising approach to generally promote photocatalytic reactions. [ABSTRACT FROM AUTHOR]

Published
2024
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33. Characterization of a CH3NH3PbI3 perovskite microwire by Raman spectroscopy.

Author

Chen, Xiaoming, Xu, Ying, Wang, Zixian, Wu, Ren‐Jie, Cheng, Horng‐Long, and Chui, Hsiang‐Chen

Subjects
RAMAN spectroscopy, PEROVSKITE, LEAD halides, SINGLE crystals, LEAD iodide
Abstract

We investigated the structural properties of organic–inorganic lead halide perovskite microwires through joint experimental and theoretical Raman spectroscopy. High‐quality methyl ammonium lead iodide (MAPBI3, MA = CH3NH3+) microwires with tetragonal phases and explicit crystalline orientation were prepared. Raman spectroscopy was used in studying the as‐prepared microwires and determining not only the crystal quality but also crystalline orientation of MAPBI3 with the aid of normal mode calculations. High‐quality structural features were verified by well‐resolved Raman peaks related to the inorganic cage (IPbI stretching and bending modes below 100 cm−1), organic MA cation motions (libration ~150–200 cm−1 and torsional ~200–250 cm−1), a coupled mode of cage and MA cation liberation (~105–110 cm−1), and the almost undetectable degraded signal at 95 cm−1. In micro‐Raman mapping, an intensity ratio of 105 and 95 cm−1 was used for the direct imaging of crystal quality along the microwire. The characterization of the crystalline orientation of MAPBI3 microwires posed a challenge, which can be addressed by using polarized Raman technique with normal mode analysis. We believe that the proposed method can be extended to other organic–inorganic lead halide perovskites with different structures, such as polycrystalline films and single crystals. [ABSTRACT FROM AUTHOR]

Published
2022
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39. Porous pâ€"n junction-induced memory characteristics in low-voltage organic memory transistors.

Author

Chou, Wei-Yang, Peng, Sheng-Kuang, Chen, Meng-Hung, Cheng, Horng-Long, Ruan, Jr-Jeng, and Huang, Yu-Hsuan

Subjects
PERYLENE, METHYL methacrylate, THIOPHENES, ORGANIC field-effect transistors, DATA warehousing, THRESHOLD voltage, FLEXIBLE electronics, MEMORY
Abstract

Low-voltage organic memory transistors (LOMTs) as data storage units are crucial for the advancements of future flexible electronics. However, charge storage mechanism remains a great challenge. In this work, we used poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno(3,2-b)thiophene) (PBTTT-C14) as the active layer and incorporated poly(methyl methacrylate) (PMMA) with the PBTTT-C14 through a simple blending process to fabricate LOMTs with porous structure. The function of the porous structure was to improve the carrier traps, which can effectively capture the holes at the charge trapping regions during the programming process. A maximum threshold voltage shift of 1.01 V was achieved when the weight ratio of PBTTT-C14 and PMMA is 7:3, and the LOMTs were operated under the programming process of âˆ'4 V/1 s. Impedance-admittance analyses were used to investigate the interfacial trap density of charge trapping regions, which is a supporter of the programming capability of LOMTs. An ultrathin dioctyl perylene tetracarboxylic diimide film was deposited on the active layer with porous structure in LOMTs. This film can increase the carriers’ erasing capability. A wide memory window of 1.64 V was obtained in LOMTs when the devices are operated under the erasing process of bias pulse of 3 V/1 s with the assistance of 2.5 mW cmâˆ'2 light irradiation. This study facilitates the development of high-performance LOMT device in fresh-type memory. [ABSTRACT FROM AUTHOR]

Published
2021
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44. Effects of Soft Insulating Polymer Doping on the Photovoltaic Properties of Polymer–Fullerene Blend Solar Cells

Author

Wu, Fu-Chiao, Hsu, Shu-Wei, Cheng, Horng-Long, Chou, Wei-Yang, and Tang, Fu-Ching

Abstract

The blending of organic semiconductor and insulating polymer as an active layer of organic transistors has been assessed by several studies and may open new possibilities for advantageous functions. However, studies on the use of insulating polymer doping in organic solar cells are rarely conducted. In this research, a blending film comprising regioregular poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) was doped with a soft insulating poly(methyl methacrylate) (PMMA) to act as an active layer of a solar cell. The fill factor (FF) and open-circuit voltage (VOC) of P3HT:PCBM solar cells were improved after PMMA doping. The microstructure-dependent photovoltaic properties of devices with different fractions of PMMA were investigated using spectroscopy and quantum chemical calculations. We highlight that PMMA doping leads to a more homogeneous conformation of P3HT chains, fewer vacancies, and fewer leakage pathways in blending films. Consequently, charges can be efficiently transported to the electrodes of devices, resulting in enhanced FF and VOC. The results of theoretical calculations at the microscopic molecular level also confirmed the enhanced electrical performance of devices from PMMA doping.

Published
2024
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