本論文研究積體化氮化鎵光電晶體光偵測器與七段顯示器的元件製作、模組電路設計與特性量測。光電晶體可以放大光電流，氮化鎵光電晶體適合偵測環境的紫外線照度，與七段顯示器積體化可顯示紫外線危險級數或顯示照度值。本研究製作此積體化元件並做特性量測，包括暗電流、外部量子效率、在不同偏壓下的響應率。以及設計電路將光電晶體的電流訊號轉換成電壓訊號，再將其電壓訊號進行二級放大，最後將電壓輸入Arduino板，控制七段顯示器顯示目前電壓對應的級數。
　　在七段顯示器光電特性量測上，啟動電壓約為2.7 V，串聯電阻約為13 Ω。在電流為20 mA下的光輸出功率約為4 mW ~5 mW，並有CCD影像。在光電晶體特性量測上，當光電晶體之逆向偏壓為9 V，外部量子效率峰值為516%，峰值波長約為389nm，對應的響應率為1.62 A/W。
　　在積體化光偵測器與七段顯示器的模組實驗，我們將光電晶體操作在逆向偏壓9V，照射波長為390 nm，得出的光電流連接至運算放大器，並提供0.36 V大小的補償電壓在非反相端以抵消暗電流，使光電流轉成電壓訊號控制在0V到0.14V區間，接著透過二級放大器使電壓訊號放大，使電壓訊號在0.1 V到2.6 V區間，最後將此電壓訊號輸入Arduino板，即可控制七段顯示器依據目前電壓顯示對應的數值。

　　This thesis study covered the component fabrication, module circuit design and characteristic measurement with the title of Integrated Gallium Nitride Photodetector and Seven-Segment Display. The basic principle of phototransistor is to amplify the photocurrent. We use Gallium Nitride phototransistor for detecting the ultraviolet light of the environment and is integrated with the seven-segment display that can monitor the ultraviolet level. In this research, the integrated device was made and its characteristics were measured, including dark current, external quantum efficiency, and responsivity under different bias voltages. The module circuit uses two Operational Amplifiers that convert the current signal of the photodetector into a voltage signal, and then amplify the voltage signal. Finally, the voltage signal is sent to Arduino board and control the seven-segment display to show the level of the voltage.
　　In the measurement of the photoelectric characteristics of the seven-segment display, the turn on voltage is about 2.7 V, and the series resistance is about 13 Ω. The light output power at a current of 20 mA is about 4 mW ~ 5 mW, and the CCD image is observed. In the measurement of phototransistor characteristics, when the reverse bias voltage is 9 V, the external quantum efficiency is 516% at the peak wavelength of 389 nm, and the corresponding responsivity is 1.62 A/W.
　　In the module experiment of the integrated photodetector and the seven-segment display, we operated the phototransistor at a reverse bias voltage of 9V with a given irradiation wavelength of 390 nm. Then, the  
resulting photocurrent was connected to the operational amplifier and provided a compensation voltage of 0.36 V at the non-inverting end to offset the dark current. Thus, the photocurrent is converted into a voltage signal controlled in the range of 0V to 0.14V, and then the voltage signal is amplified through a two-stage amplifier to make the voltage signal in the range of 0.1 V to 2.6 V. Finally, this voltage signal is sent to the Arduino board, and the seven-segment display can be controlled to display the corresponding value according to the current voltage.

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