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Assembly Series

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McKelvey School of Engineering

Brown School

ESE Defense: Junyi Zhao

Tuesday, July 2 | 1:00 PM - 3:00 PM

Preston M. Green Hall, Rodin Auditorium, L0120
135 N Skinker Blvd, St. Louis, MO 63112, USA

Soft Electronics & Systems for Display and Healthcare Applications

Abstract: As conventional technology has reached its performance ceiling (e.g., the deceleration of Moore's Law; 31% theoretical maximum efficiency of silicon solar cells), soft electronics have emerged as a revolutionary platform, marking a pivotal shift from a performance-centric focus to a human-centered principle that prioritizes accessibility, sustainability, and user experiences. I strive to seamlessly integrate biological systems with closed-loop electronic frameworks by innovating diverse soft electronic devices and systems that encompass power, sensation, computing, display, and feedback. Efforts have been dedicated to bridging fundamental material studies, advanced manufacturing, novel electronic devices, and system-level integrations. This interdisciplinary endeavor aims to foster soft electronics as a platform for the nexus of energy, healthcare, and human-machine interactions. This dissertation has focused on the following areas:

Intrinsically Flexible/Stretchable Perovskite Optoelectronic Devices: The mutual transformation between electricity and light is recognized as one of the most profound energy conversions for humanity. This research advances sustainable processing for the emerging photoelectric semiconductor, namely Perovskite, through novel device architectures and cutting-edge manufacturing strategies to fabricate various flexible and stretchable optoelectronic devices, including displays and photodetectors. Additionally, a versatile and eco-friendly fabrication methodology, termed handwriting, has been innovated to enable multicolor light-emitting diodes and photodetectors to be “drawn” on various substrates, including paper, textile, plastics, elastomers, rubber, and 3D objects, potentially enriching the functionality of broad flexible electronics applications.

System-Level Wearable Electronics for Digital Health: Traditional bulky and costly medical equipment poses a substantial barrier to achieving accessible and equitable healthcare, exacerbating disparities in healthcare provision. To address this challenge, cost-effective and skin-interfaced flexible/stretchable electronics for personalized digital healthcare have been developed, involving fundamental biocompatible material innovation, leveraging manufacturing techniques, and seamless integration with miniaturized circuitry. The developed system-level wearable E-textile has been successfully implemented in clinical human studies for real-time and continuous electrophysiology monitoring, particularly for maternal and fetal healthcare.

Event Type



McKelvey School of Engineering


Science & Technology

Electrical & Systems Engineering


Event Contact

Aaron Beagle | abeagle@wustl.edu

Speaker Information

Junyi Zhao

P.I. Chuan Wang

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