2014
DOI: 10.1109/tcsi.2013.2286031
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Ambient Light Organic Sensor in a Printed Complementary Organic TFT Technology on Flexible Plastic Foil

Abstract: This paper presents an organic sensor for ambient light monitoring fabricated on flexible plastic foil. The sensor exploits an organic photodiode whose photocurrent is linearly converted into an output voltage by a transconductance operational amplifier in a feedback configuration. The photodiode is based on an inkjet printed bulk heterojunction blend of P3HT/PCBM sandwiched between Au and Al electrodes, whereas the amplifier is implemented in a printed complementary organic TFT technology. Both the photodiode… Show more

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Cited by 28 publications
(27 citation statements)
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“…Furthermore, the bias point is set by the current balance of two transistors both biased in saturation with a relatively large overdrive, enabling rather limited sensitivity to process parameter variations (Figure 3.3b). For reasonably well matched mobility and threshold voltage values, symmetric VTCs are achieved, which generally allow direct-coupled multistage amplifiers [7], [8], [124], [125].…”
Section: Single-input Amplifiersmentioning
confidence: 99%
“…Furthermore, the bias point is set by the current balance of two transistors both biased in saturation with a relatively large overdrive, enabling rather limited sensitivity to process parameter variations (Figure 3.3b). For reasonably well matched mobility and threshold voltage values, symmetric VTCs are achieved, which generally allow direct-coupled multistage amplifiers [7], [8], [124], [125].…”
Section: Single-input Amplifiersmentioning
confidence: 99%
“…Further, the shift amount of TFT's current-to-voltage characteristics more likely to increase under illumination. For the conventional sensing approaches, TFTs are used for light-tocurrent converting, and lots of calibration steps are required for the external readout circuit to get the exact value of light intensity [7]. And complicated external readout circuit including amplifier, analog-to-digital converters are usually needed [8].…”
Section: Introductionmentioning
confidence: 99%
“…Fiore, P. Battiato, and G. Palmisano are with DIEEI, Università di Catania, Catania, battiatoplacido@gmail.com, giuseppe.palmisano@dieei.unict.it [4]. This technology has been recently used to explore the feasibility of a RFID tag with active envelope detection, making possible to demodulate ASK PWM-coded signals with modulation depth (h) as low as 25% [15].…”
Section: Introductionmentioning
confidence: 99%
“…In recent years, a printed complementary organic TFT (C-OTFT) technology has been developed [10], [11] and successfully employed to design digital and analog circuits [12], [13], a 4-bit analog-to-digital converter [14] and a light sensor [4]. This technology has been recently used to explore the feasibility of a RFID tag with active envelope detection, making possible to demodulate ASK PWM-coded signals with modulation depth (h) as low as 25% [15].…”
Section: Introductionmentioning
confidence: 99%