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Related Experiment Video

Updated: May 14, 2026

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

Published on: August 17, 2017

Interface trap states in organic photodiodes.

Francesco Arca¹, Sandro F Tedde, Maria Sramek

¹Siemens AG, Corporate Technology, Günter-Scharowsky-Strasse 1, 91058 Erlangen, Germany. francesco.arca.ext@siemens.com

Scientific Reports

|February 23, 2013

Summary

Organic photodiodes (OPDs) show promise for large-area optical sensing. Interface engineering significantly enhances their dynamic behavior, enabling kHz frequency response at low light levels for industrial and medical applications.

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Area of Science:

Materials Science
Optoelectronics
Semiconductor Physics

Background:

Organic semiconductors offer advantages for large-area optical sensing due to facile processing.
Existing organic sensors face challenges in sensitivity and dynamic behavior compared to silicon devices.
Charge trapping phenomena limit the bandwidth of organic photodiodes (OPDs) at low light.

Purpose of the Study:

To investigate and overcome the bandwidth limitations in organic photodiodes (OPDs).
To achieve kHz frequency response in large-area OPDs at low light intensities.
To demonstrate the suitability of enhanced OPDs for industrial and medical sensing applications.

Main Methods:

Interface engineering of organic photodiodes.
Characterization of device capacitance and frequency response.
Evaluation of performance at low light levels (20 nW cm⁻²).

Main Results:

Demonstrated kHz frequency response in OPDs despite large capacitances (~10 nF cm⁻²).
Achieved a 1000-fold improvement in frequency response compared to state-of-the-art OPDs.
Overcame bandwidth limitations caused by charge trapping phenomena.

Conclusions:

Interface engineering is crucial for enhancing the dynamic behavior of organic photodiodes.
Large active area OPDs with kHz response are viable for demanding sensing tasks.
The improved performance meets requirements for industrial sensing and medical imaging (e.g., X-ray detection).