| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1264728 | Organic Electronics | 2011 | 4 Pages |
We demonstrate an imaging passive pixel sensor circuit consisting of a bottom-gate, top-contact pentacene organic thin-film transistor (OTFT) integrated with a top-illuminated, inverted subphthalocyanine/C60 organic photodetector (OPD). The vacuum-deposited OTFT utilizes parylene as the gate insulator, achieving a drain current ON/OFF ratio of 105. The transistor hole mobility is 0.09 ± 0.02 cm2/V s. The inverted OPD has a dark current of 20 pA at a reverse bias of 1.5 V. By integrating the two components, a 12-bit dynamic range passive pixel sensor is achieved, with an OFF current of 31 ± 5 pA and a pixel readout time of 0.4 ± 0.05 ms, limited by the discharge time of the OTFT channel. The integrated pixel has potential for use in large-scale focal plane array imagers.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We demonstrate an integrated organic thin film transistor and photodetector. ► Applications to high sensitivity (detectivity >1011 Jones), high dynamic range (12-bit) imagers. ► Four hundred microsecond response suitable for video imaging. ► Off current of 30 pA.
