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Micro-light-emitting-diode array with dual functions of visible light communication and illumination

Chinese Physics B 2017年第10期26卷 490-495页

作者：黄涌郭志友孙慧卿黄鸿勇 Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices Institute of the Opto-Electronic Materials and Technology South China Normal University Guangdong Engineering Technology Research Center of Optoelectronic Functional Materials and Devices

We demonstrate high-speed blue 4 ×4 micro-light-emitting-diode （LED） arrays with 14 light-emitting units （two light-emitting units are used as the positive and negative electrodes for power supply, respectively） comprising multiple quantum wells formed of GaN epitaxial layers grown on a sapphire substrate, and experimentally test their applicability for being used as VLC transmitters and illuminations. The micro-LED arrays provide a maximum -3-dB frequency response of 60.5 MHz with a smooth frequency curve from 1 MHz to 500 MHz for an optical output power of 165 mW at an injection current of 30 mA, which, to our knowledge, is the highest response frequency ever reported for blue GaN-based LEDs operating at that level of optical output power. The relationship between the frequency and size of the device single pixel diameter reveals the relationship between the response frequency and diffusion capacitance of the device.

关键词： light-emitting devices optical communications diffusion capacitance

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Effect of the Dynamic Resistance on the Maximum Output Power in Dynamic Modelling of Photovoltaic Solar Cells

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Open Journal of Modelling and Simulation 2022年第1期10卷 48-57页

作者： Siaka Touré Solar Energy Laboratory Félix Houphou&#235t-Boigny University of Abidjan Cocody Abidjan C&#244te d’Ivoire

Several studies on PV solar cells are found in the literature which use static models. Those models are mainly one-diode, two-diode or three-diode models. In the dynamic modelling, a variable parallel capacitance is incorporated. Unlike the previous studies which do not clearly establish a relationship between the capacitance and the voltage, in the present paper, the link between the capacitance and the voltage is investigated and established. In dynamic modelling investigated in this paper, the dynamic resistance is introduced in the modelling of the solar cell. It is introduced in the current-voltage characteristic. The value of the dynamic resistance is evaluated at the maximum power point and its effect on the maximum power is investigated. The study shows for the first time, that the dynamic resistance must be introduced in the current-voltage characteristic, because it has an influence on the PV cell output.

关键词： Photovoltaic Solar Cells Dynamic Modelling Dynamic Resistance diffusion capacitance Transition capacitance

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Study on the High Speed Si Phototransistor

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Wuhan University Journal of Natural Sciences 1997年第4期2卷 49-52页

作者： Chen Bingruo Gao Fanrong Wang Biao Wuhan University Department of Physics Wuhan China (GRID:grid.49470.3e) (ISNI:***)

In order to reduce collector capacitance, the high speed Si phototransistor with grid pattern is presented. The advantages and disadvantages of grid pattern are analyzed. Through optimum design of geometries, device configurations and material parameters and reduction of the diffusion capacitance and the base resistance, the response time of Si phototransistor is shorter than 0.7 μs for the first time.

关键词： response time barrier capacitance diffusion capacitance base resistance

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