Dual-mode photomultiplication 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 solution- processable, 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-mode OPDs optimized for photodetection at the specific spectral ranges have been reported. Realizing dual-mode OPDs with high detectivity in two bands are very attractive for different applications. However, the reports on spectral tunable OPDs are rather rare. It is a great challenge to achieve a high performance OPD with dual-mode photo-responses in two distinct bands.

In this application, we propose to develop a novel dual-mode photomultiplication OPD with a unique tunable photodetection capability, particularly over the near-infrared (NIR) and visible light wavelength ranges, that can be operated by adjusting the polarity of the biases. A dual-mode OPD comprises a tri-layer visible light absorber/optical spacer/NIR absorber configuration. In the presence of NIR light, photocurrent can be produced in the NIR absorbing layer, due to the trap-assisted charge injection at the NIR absorber/cathode interface under a reverse bias. In the presence of the visible light, photocurrent can be produced in the visible light absorbing layer, enabled by the trap- assisted charge injection at the anode/visible light absorber interface under a forward bias. A bias-switchable spectral response dual-mode photomultiplication OPD offers an attractive option for a plethora of applications in environmental pollution, bio, medical, agricultural, automotive and security monitoring, detection and imaging in two distinct bands.
Effective start/end date1/08/2031/01/24

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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