Polymerupdate Press Release – Toyobo Accelerates Development of Photoelectric Conversion Material for Organic Photodiodes; successfully realizes a prototype module with world-class sensitivity*1 with the French research organization CEA
Toyobo Co., Ltd. is accelerating the development of an organic photoelectric conversion material that converts light energy into electrical energy. In the latest stage of this endeavor, Toyobo has successfully produced a prototype Organic Photodiode (OPD) module containing this material, which has superb sensitivity, due to one of the world’s lowest levels*1 of DC current. darkness*2. This research was conducted in collaboration with CEA, a French government institute for energy research using the material for organic photodiodes. Virtually all new devices are capable of connecting to the internet, so Toyobo aims to have this material used as an optical sensor for Internet of Things (IoT) devices by the end of 2025.
Various electronic devices have optical sensors that detect the brightness of light. Currently, photodiodes that convert differences in light intensity into electrical signals are fabricated primarily by high-temperature vapor deposition on a glass substrate of a photoelectric conversion material composed of silicon and other inorganic substances. The OPD that Toyobo is developing can be made by a simpler method, in which an organic photoelectric conversion material is dissolved in a solution and then applied to a glass or plastic substrate. This reduces production costs and associated environmental impacts, compared to conventional photodiodes. Additionally, the use of films and other flexible materials as the substrate allows greater freedom in shaping the target components, expanding the range of photosensor applications and opening the door to extensive use in various industries.
Toyobo has developed a diverse range of organic materials by exploiting its sophisticated organic synthesis technologies. Since 2019, Toyobo and the CEA have been conducting joint research on an energy-generating material for organic photovoltaics*3. In addition, since 2020, Toyobo and the CEA have been jointly developing an organic photoelectric conversion material for photosensors, essential for the IoT. This research resulted in a prototype OPD module with excellent sensitivity capable of detecting weaker light than that which silicon photodiodes already on the market can detect. Specifically, this prototype achieved one of the lowest dark current levels in the world, less than 10-9 A/cm2 when subjected to -5V voltage, the benchmark for commercial application. . During joint verification with CEA, Toyobo’s photoelectric conversion material was confirmed to have the same level of dark current when applied to a glass substrate or a polyethylene terephthalate film substrate ( PET).
Toyobo is committed to creating a safer society that gives people peace of mind by putting into practice the hardware for advanced photosensors that require low dark current used for IoT electrical appliances, electronic devices as soon as possible. fingerprint authentication and other products.
About the CEA
The CEA is a key player in research, development and innovation in four main areas: energy transition, digital transition, technologies for the medicine of the future and defense and security. With a workforce of 20,000 people, based on nine sites equipped with very large-scale research infrastructures, the CEA actively participates in collaborative projects with numerous academic and industrial partners, in France, Europe and around the world. According to the Clarivate 2022 ranking, the CEA is in the Top 100 Global Innovators, in number of patents filed in France and Europe.
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