2023 AIChE Annual Meeting
Optimizing Silver Selenide Vertical Devices for High Sensitivity Near Infrared Imaging
Near infrared imaging has promising potential applications including but not limited to detecting crop conditions, enabling night vision, and studying changing weather patterns. In the technology, colloidal quantum dots, which are semiconductor particles a few nanometers in size, are used as photodetectors, converting absorbed light in the range of 700 nm to 1600 nm into electrical current. In our work, we build silver selenide (Ag2Se) vertical devices, for its potential as a near infrared photodiode. By manipulating particle sizes, ligands, and particle deposition methods, we can alter the electrical properties of silver selenide. Photodiodes, which consist of hole and electron blocking layers interposed between the colloidal quantum dots layers, are built and measured. By evaluating the impact of each factor on the rise of conductivity and responsivity of the silver selenide photodiode, we aim to optimize Ag2Se vertical devices for high sensitivity near infrared imaging.