X-Ray Detector-on-Plastic With High Sensitivity Using Low Cost, Solution-Processed Organic Photodiodes

Gelinck, Gerwin H.; Kumar, Abhishek; Moet, Date; Steen, Jan‐Laurens P. J. van der; Breemen, Albert J. J. M. van; Shanmugam, Santosh; Langen, Arjan; Gilot, J Jan; Groen, W.A.; Andriessen, Ronn; Simon, M.E.; Ruetten, Walter; Douglas, Alexander; Raaijmakers, Rob; Malinowski, Paweł E.; Myny, Kris

doi:10.1109/ted.2015.2432572

Cited by 87 publications

(81 citation statements)

References 18 publications

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“…The negative bias voltage applied to OPD arrays when integrated with a TFT matrix ensures that the diode remains sufficiently charged, and effectively implies that the readout charge is linearly proportional to the amount of collected photocarriers. The reverse bias also increases the response speed of the diode, and often the collection efficiency, i.e., the extraction of photogenerated charge carriers at the contacts.…”

Section: Introductionmentioning

confidence: 99%

“…In 2014, Zhao et al proposed OPD‐based X‐ray imagers with amorphous indium gallium zinc oxide TFTs for next generation digital breast tomography systems. A proof‐of‐concept X‐ray detector on thin plastic foil with 120 × 160 pixel format and 126 μm pixel size was demonstrated by Gelinck et al This combined a CsI:Tl scintillator with an OPD array and an oxide TFT backplane. The OPD layer was slot‐die coated directly on the active matrix backplane on thin‐plastic substrate.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Organic Photodetectors and their Application in Large Area and Flexible Image Sensors: The Role of Dark Current

Simone

Dyson

Meskers

et al. 2019

Adv Funct Materials

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291

357

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Organic photodetectors (OPDs) have gained increasing interest as they offer cost-effective fabrication methods using low temperature processes, making them particularly attractive for large area image detectors on lightweight flexible plastic substrates. Moreover, their photophysical and optoelectronic properties can be tuned both at a material and device level. Visible-light OPDs are proposed for use in indirect-conversion X-ray detectors, fingerprint scanners, and intelligent surfaces for gesture recognition. Near-infrared OPDs find applications in biomedical imaging and optical communications. For most applications, minimizing the OPD dark current density (J d ) is crucial to improve important figures of merits such as the signal-to-noise ratio, the linear dynamic range, and the specific detectivity (D*). Here, a quantitative analysis of the intrinsic dark current processes shows that charge injection from the electrodes is the dominant contribution to J d in OPDs. J d reduction is typically addressed by fine-tuning the active layer energetics and stratification or by using charge blocking layers. Yet, most experimental J d values are higher than the calculated intrinsic limit. Possible reasons for this deviation are discussed, including extrinsic defects in the photoactive layer and the presence of trap states. This provides the reader with guidelines to improve the OPD performances in view of imaging applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Organic Photodetectors and their Application in Large Area and Flexible Image Sensors: The Role of Dark Current

Simone

Dyson

Meskers

et al. 2019

Adv Funct Materials

Self Cite

291

357

View full text Add to dashboard Cite

show abstract

“…We believe that the presented technology enables new markets. Previously we reported a 120x160, 200-ppi X-ray detectors that meet medical requirements [1]. Here, we demonstrate a prototype of a palm print scanner.…”

Section: Impactmentioning

confidence: 89%

“…The materials can be processed from solution over large area, making them attractive for photovoltaics but also photo-imaging applications where area is key. Furthermore, their low processing temperature also allows the use of non-glass substrates such as flexible polyester films [1].…”

Section: Objective and Backgroundmentioning

confidence: 99%

39‐3: Printed Organic Photodetector Arrays and their use in Palmprint Scanners

Akkerman

Peeters

Breemen

et al. 2018

Symp Digest of Tech Papers

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“…Many applications of a-IGZO Thin Film Transistors (TFTs) have been demonstrated already, such as large AMOLED display backplanes [10], USB powered NFC tags [11], and flexible x-ray imagers [12].…”

mentioning

confidence: 99%

Analogue Frontend Amplifiers for Bio-Potential Measurements Manufactured With a-IGZO TFTs on Flexible Substrate

Garripoli

Steen

Torricelli

et al. 2017

IEEE J. Emerg. Sel. Topics Circuits Syst.

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Three novel differential amplifier topologies using double gate a-IGZO TFTs on flexible substrate are presented in this paper. The designs exploit positive feedback and a load with self-biased top gate to achieve the highest static gain in single stage a-IGZO amplifiers reported to date. After fabrication, the three amplifiers exhibit respectively a static gain of 14 dB, 21.5 dB and 30 dB, with a bandwidth of 2 kHz, 400 Hz, and 150 Hz. Also, for each circuit the input referred noise has been measured to be 420 μVrms, 195 μVrms and 146 μVrms, respectively. Based on these results, the a-IGZO amplifier providing the highest gain is suitable as front-end for heart rate measurements and, with some further optimization verified in simulation, can also be used for other bio-potential applications, like electro hysterogram and electro cardiogram

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X-Ray Detector-on-Plastic With High Sensitivity Using Low Cost, Solution-Processed Organic Photodiodes

Cited by 87 publications

References 18 publications

Organic Photodetectors and their Application in Large Area and Flexible Image Sensors: The Role of Dark Current

Organic Photodetectors and their Application in Large Area and Flexible Image Sensors: The Role of Dark Current

39‐3: Printed Organic Photodetector Arrays and their use in Palmprint Scanners

Analogue Frontend Amplifiers for Bio-Potential Measurements Manufactured With a-IGZO TFTs on Flexible Substrate

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