Ms. Kadaba Swathi Profile

Kadaba Swathi

Doctoral Candidate at JNCASR

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Proceedings Article | 27 September 2016 Paper

Solution processed integrated pixel element for an imaging device

K. Swathi, K. Narayan

Proceedings Volume 9944, 99440T (2016) https://doi.org/10.1117/12.2235274

KEYWORDS: Photodiodes, Sensors, Field effect transistors, Polymers, Image sensors, Dielectrics, Chemical elements, Image processing, TCAD, Oxides

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We demonstrate the implementation of a solid state circuit/structure comprising of a high performing polymer field effect transistor (PFET) utilizing an oxide layer in conjunction with a self-assembled monolayer (SAM) as the dielectric and a bulk-heterostructure based organic photodiode as a CMOS-like pixel element for an imaging sensor. Practical usage of functional organic photon detectors requires on chip components for image capture and signal transfer as in the CMOS/CCD architecture rather than simple photodiode arrays in order to increase speed and sensitivity of the sensor. The availability of high performing PFETs with low operating voltage and photodiodes with high sensitivity provides the necessary prerequisite to implement a CMOS type image sensing device structure based on organic electronic devices. Solution processing routes in organic electronics offers relatively facile procedures to integrate these components, combined with unique features of large-area, form factor and multiple optical attributes. We utilize the inherent property of a binary mixture in a blend to phase-separate vertically and create a graded junction for effective photocurrent response. The implemented design enables photocharge generation along with on chip charge to voltage conversion with performance parameters comparable to traditional counterparts. Charge integration analysis for the passive pixel element using 2D TCAD simulations is also presented to evaluate the different processes that take place in the monolithic structure.

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