Title :
A New Sensing Scheme for Sensitivity Enhancement of Low-Temperature Polycrystalline Silicon Photodetecors
Author :
Chen, Chih-Yang ; Lin, Chrong-Jung ; King, Ya-Chin
Author_Institution :
Inst. of Electron. Eng., Nat. Tsing-Hua Univ., Hsinchu, Taiwan
fDate :
6/1/2011 12:00:00 AM
Abstract :
A photo-detector employing a pulse-frequency-modulation (PFM) circuit featuring an adjustable response is realized on a Low Temperature Polycrystalline Silicon (LTPS) panel. A constant-biasing scheme on the photodiode is proposed to overcome the low sensitivity problem in LTPS PIN diodes and greatly improves the output response. Furthermore, an LTPS PIN diode model capable of accurately predicting the characteristics of the detector circuits is established and verified.
Keywords :
detector circuits; elemental semiconductors; p-i-n diodes; photodetectors; photodiodes; pulse frequency modulation; silicon; LTPS panel; LTPS pin diode model; PFM circuit; Si; constant-biasing scheme; detector circuits; low temperature polycrystalline silicon panel; low-temperature polycrystalline silicon photodetecors; photodiode; pulse-frequency-modulation circuit; sensitivity enhancement; Mathematical model; PIN photodiodes; Photoconductivity; Silicon; Temperature sensors; Thin film transistors; Low-temperature polycrystalline silicon; Schmitt trigger; pulse-frequency modulation; thin- film transistors;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2010.2098437
