Paper Title
Significance of Encapsulation on The Organic Temperature Sensor Through Spatial Atmospheric Atomic Layer Deposition (Saald) System to Enhance Its Performance

Abstract
Printed organic sensors are of great value owing to their simplicity, low cost and easy fabrication however, they often face the problem of performance degradation when exposed to ambient environment. In this study, we propose atomically thin and highly reliable encapsulation layer on the surface of organic functional material to enhance its lifetime as a temperature sensing unit. Our temperature sensor is based on conductive and highly uniform IDT patterns deposited on glass substrate through advanced printing technology of reverse offset. PEDOT:PSS is used as the temperature sensitive functional layer deposited through electrohydrodynamic atomization (EHDA) printing system. Organic functional material was further encapsulated with aluminum oxide (Al2O3) as deposited through spatial atmospheric atomic layer deposition system (SAALD) to complete entire device fabrication. The developed sensors were measured in the temperature range of 20 oC to 90 oC with relative humidity reaching up to 75%. The obtained results exhibited good linearity with significant repeatability. The results of both encapsulated and non-encapsulated temperature sensors were compared to each other and it was found that the encapsulated sensor exhibited more reliable, robust, repeatable, and long lasting sensing behavior as compared to the non-encapsulated sensor. Keywords - All-Printed, Al2O3 Encapsulation, Organic Temperature Sensor, PEDOT:PSS