Browsing by Author "Chang, Chi-Ming"

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Solution-processed organometallic quasi-two-dimensional nanosheets as a hole buffer layer for organic light-emitting devices
(2020-04-07)
Liu, Shihao
;
Wang, Ying-Chiao
;
Chang, Chi-Ming
;
Yasuda, Takeshi
;
Fukui, Naoya
Two-dimensional (2D) vdW materials have been integrated into optoelectronic devices to achieve exceptional functionality. However, the integration of large-area 2D thin films into organic light-emitting devices (OLEDs) remains challenging because of the finite number of inorganic 2D materials and the high-temperature requirements of their deposition process. The construction of 2D organometallic materials holds immense potential because of their solution synthesis and unlimited structural and functional diversity. Here, we report a facile route using an oil-water interfacial coordination reaction between organic ligands and divalent metal ions to synthesize crystalline quasi-2D organometallic bis(dithiolato)nickel (NiDT) nanosheets with a centimeter scale and a tunable thickness. The NiDT nanosheets can be directly integrated into OLEDs for use as a hole buffer layer and a fluorescent mounting medium without the aid of a transfer process. Moreover, OLEDs with NiDT nanosheets show not only comparable efficiency to conventional OLEDs but also prolonged device lifetime by nearly 2 times. These results open up a new dimension to use quasi-2D organometallic nanosheets as functional layers in large-area organic devices.
THREE-AXIS CMOS MEMS INDUCTIVE ACCELEROMETER WITH NOVEL Z-AXIS SENSING SCHEME
(2017-01-01)
Chiu, Yi
;
Hong, Hao-Chiao
;
Chang, Chi-Ming
;
電機工程學系
;
Department of Electrical and Computer Engineering
This paper reports a three-axis CMOS MEMS inductive accelerometer fabricated by a 0.18. m CMOS process. The folded suspension beams around the single shuttle mass function as springs and inductor windings simultaneously. The winding inductance is changed upon deformation due to the shuttle mass displacement. The inductance variation is sensed by differential LC-tank oscillators. A novel z-axis inductive sensing scheme is proposed. Experiments showed sensitivities of 12.9, 21.6, and 1.2 kHz/g in the x, y, and z axes, respectively.