Micro-Processing Stable Optoelectronic Perovskite Thin Films

Updated: about 1 month ago
Deadline: 11 Jul 2021

- Research outline

Solution-processed all-inorganic CsPbI3 perovskite is increasingly being considered for applications well beyond photovoltaics, for example, as the active regions within thin film photonic devices like cameras and LEDs. Its high-temperature optically active black phase (>320°C) is metastable relative to its non-perovskite yellow phase at room temperature (RT), representing a major impediment for real-world applications. In 2019, a fundamentally new and effective stabilization approach was developed by the Roeffaers Group to secure a RT black phase, based on interface/strain engineering (DOI: 10.1126/science.aax3878). Extending this recent discovery, a refined method for patterning the perovskite thin film surface with a micrometer-scale grid, via direct visible laser writing, renders ambient-stable black phase materials. This result strictly goes against current mainstream knowledge. To further develop this discovery and foster device-readiness, this project aims to comprehensively explore realistic scale-up thin film micro-processing options. Based on fundamental structure-property relationships provided by our local collaborating team, the successful applicant will develop a device readiness framework; from refining the pre-cursor solution and spin-coating procedure and scaling up clean-room microfabrication (masked UV-VIS and X-ray lithography), to prototyping photonic devices.

- Job description

The main goal of this position is to further development existing perovskite thin film solution processing procedures and effectively combine them with micro-fabrication techniques (utilizing commercial setups, like masked UV-VIS lithography) to form stable thin films. Using proven stabilization routes which yield good thin film optical properties (i.e. PLQY, PL lifetimes and carrier transport), the project will realize stable working photonic devices and test their performance (pixel cross-talk, response sensitivity and time, etc.). All aspects of the work plan (materials synthesis, routine characterization and device fab and testing) will be completed in a supportive environment designed to help the applicant learn, grow and mature their multidisciplinary research skills.

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