Princeton University

School of Engineering & Applied Science

System Building, Two Ways: Development and Application of ZnO TFT Technology in Large-Area Hybrid Sensing Systems

Yasmin Afsar
Engineering Quadrangle B327
Thursday, November 2, 2017 - 4:00pm to 5:30pm

In this talk, we cover a broad span of topics all unified by the desire to build “large-area electronics” (LAE) — electronic systems on meter-scale glass and plastic substrates. In particular, the diversity of available sensors coupled with the variety of compatible large scale, conformal substrates in LAE provides a unique opportunity to realize powerful sensing systems at a massive scale. Our group aims to make these fantasies more concrete by building large-area sensing systems that combine LAE technologies (sensors, energy harvesters, thin-film transistors) with silicon CMOS integrated circuits, exploiting the complementary strengths of the two technology domains. We call these “hybrid sensing systems.”
This work focuses on exploiting a high-performance thin-film semiconductor, zinc oxide, for use in hybrid sensing systems. We cover design and construction of a deposition system for metal oxide thin-film deposition, thin-film transistor (TFT) development on glass and plastic substrates, ZnO TFT circuits, and a demonstration of a new hybrid system architecture that leverages fast ZnO circuits to greatly expand the number of sensors our sensing systems can accommodate.