Integrated Colloidal Quantum Dot (QD) smart optoelectronic devices for the Internet of Things (IoT)

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Colloidal QD and QD-based optoelectronic devices are promising candidates for the Internet of Things (IoT) applications, as both light-source (LED) and information transmitters (phototransistors). Benefiting from their customisable bandgap (size-dependent and composition-dependent), solution processability, strong light-matter interaction CdSe and PbS QDs have already shown remarkable results in LEDs and solar cells. According to Touch Display, Research and IDTex recently estimated that the overall QD market would reach $10.8 billion by 2026. However, it is essential to get away from toxic elements such as Cd and Pb, and obtain a comprehensive understanding of underlying physics/chemistry before these versatile and solution-processed materials can be well-integrated into IoT technology. Here, we combine new processing technologies (continuous-flow) with advanced microscopy and spectroscopy techniques to develop QD IoTs with minimum power consumption and sustainable energy supplies, in three key objectives: i) Development of Cadmium-free narrow electroluminescence bandwidth QD LEDs based on I-III-VI and I-II-III-VI compound semiconductors (CuInS2 and CuZnInS3) ii) Development of high-sensitivity QD Phototransistors based on I-III-VI and I-II-III-VI compound semiconductors (CuInS2 and CuZnInS3). iii) Understanding of key light-induced charge transport and exciton dynamics in (i) and (ii) using ultrafast spectroscopy.The outcome will be a demonstration of an entire solution-processed integrated IoT module based on QDs.