In this study, we utilize graphene's unique combination of IR-transparency and electrical conductivity as an electrode material for pyroelectric infrared sensing. Our work takes a different approach from recent studies, all of which have considered ways to improve graphene's absorption for bolometric infrared detection. We integrate graphene electrodes with a polyvinylidene fluoride (PVDF) active layer to develop a flexible detector capable of achieving a specific detectivity comparable to other PVDF sensors in literature. More importantly, we show that the use of graphene as an IR-transparent electrode enables an order of magnitude improvement in operating frequency compared to other pyroelectric sensors. We further demonstrate that our device structure is compatible with pixelation, and capture several thermal images with minimal crosstalk. Our work thus highlights a new route for the utilization of graphene for faster and flexible thermal imaging applications.
National University of Singapore, National University of Singapore
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