Multispectral Organic Photodetectors

Project: Research project

Project Details


Organic photodetectors (OPDs) are a promising alternative optical detecting technology to conventional wafer-based inorganic counterparts, because the optical and electric properties of the organic semiconductor materials can be tailored accordingly. They offer additional advantages such as having a solution-processable fabrication process, which also leads to significant cost benefits, thereby creating next-generation solutionprocessable, flexible, and low-cost photodetectors. In general, the spectral responses of
the photodetectors are determined by the absorption of the active materials and optical profile in the devices. Single-band OPDs optimized for photodetection at the specific spectral ranges have been reported. However, the reports on OPDs for multispectral
detection are rather rare. It is a great challenge to achieve high-performance multispectral OPDs.

This project proposes to develop a novel filter free multispectral OPD using a back-toback stacked photodiode/photomultiplication (photodiode/PM) double heterojunction
structure. The front junction responds to short-wavelength (visible) light, whereas the rear junction responds to near-infrared (NIR) light. The use of a back-to-back stacked photodiode/PM double heterojunction in the OPD will improve NIR responsivity through PM effect, due to the trap-assisted charge injection at the PM-type NIR absorber/cathode interface under a reverse bias. The photodiode/PM double heterojunction OPD allows a multispectral detection that is controlled by the polarity of a bias voltage applied between the two contacts in the device. The OPD will also exhibit
a broadband photoresponse when it is operated using a 50% duty-cycled square-wave voltage supply. The resulting technology will enable high-performance multispectral OPDs for applications in areas such as security monitoring, artificial intelligence, highresolution image sensing, Internet of Things, and optical communications.
Effective start/end date1/01/2431/12/26

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 9 - Industry, Innovation, and Infrastructure
  • SDG 12 - Responsible Consumption and Production


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