کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9700814 | 1462130 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Gas sensors based on high blue spectral responsivity photodiodes
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Silicon (Si) photodiodes with a finger p-n junction have been modeled, designed, fabricated and tested. The surface depletion region (down to 200Â nm from top of the Si substrate) between neighboring n+-finger implants provides for a very effective collection of photons in the blue spectral range, thus enhancing the responsivity, especially for devices with larger interfinger distance. At 420Â nm wavelength and 5Â V reverse bias the measured responsivity is 0.24Â A/W with respect to 0.14Â A/W standard reference photodiodes made on the same substrate, with a maximum value of 0.44Â A/W observed at 20Â V reverse bias. The finger photodiodes have been evaporated by metalloporphyrin films, able to change their absorption spectrum in the Soret band, around 440Â nm, on exposure to volatile organic compounds (VOCs). A blue light source has been employed to test the sensors response to ethanol at room temperature and concentrations down to 300Â ppm were measured with the Zn-T(heptyloxy)PP.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volumes 111â112, 11 November 2005, Pages 242-246
Journal: Sensors and Actuators B: Chemical - Volumes 111â112, 11 November 2005, Pages 242-246
نویسندگان
A. Tibuzzi, F. Ficorella, R. Paolesse, G.-F. Dalla Betta, M. Boscardin, A. Macagnano, C. Di Natale, G. Soncini, A. D'Amico,