CBE Colloquia - Multispectral Organic Photodetectors: Frontiers and Applications
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Organic photodetectors (OPDs) are transforming light detection in modern optoelectronics. Unlike conventional inorganic, wafer-based photodetectors, OPDs harness the tunable properties of organic semiconductors. Through precise molecular design and solution-based fabrication, their optical and electronic characteristics can be tailored, enabling devices that are lightweight, flexible, and cost-effective. Traditionally, most OPDs are limited to single-band detection within specific spectral regions. However, advanced applications, such as high-resolution imaging, smart sensing, and secure communications, require devices capable of multispectral detection. Achieving high-performance multispectral OPDs remains a key challenge in the field.
This seminar will present recent breakthroughs in bias-switchable multispectral OPDs featuring a novel back-to-back stacked double heterojunction architecture. In this design, the front junction responds to short-wavelength (visible) light, while the rear junction is sensitive to long-wavelength (near-infrared, NIR) light. By adjusting the polarity of the applied voltage, spectral selectivity can be precisely controlled, providing both flexibility and enhanced functionality. This innovative approach overcomes the limitations of conventional inorganic detectors, e.g., rigidity and complex fabrication, while delivering improved performance. These advances unlock exciting opportunities for multispectral OPDs in diverse fields, including security monitoring, advanced imaging, artificial intelligence, and encrypted optical communications.
Professor Furong Zhu is Chair Professor of Physics, Head of Department of Physics, Hong Kong Baptist University (HKBU). He earned his BSc and MSc in Physics from Fudan University, and his PhD in Applied Physics from Charles Darwin University, Australia. Following postdoctoral work at Kyoto University, Japan, Prof. Zhu held research positions at Murdoch University and the Institute of Materials Research and Engineering (IMRE), Singapore, where he led R&D programs in organic optoelectronics. His research focuses on device physics, nanostructures, and semiconducting materials, advancing technologies in organic near-infrared photodetectors, high-performance solar cells, and organic/perovskite optoelectronic devices.