Performance Analysis of Fully Flexible Organic Humidity Sensor with Top-Contact and Bottom-Contact OTFTs

Abstract

Abstract: Organic field-effect transistor (OFET) based humidity sensors are extensively used nowadays due to their low cost, mechanically flexible and compatibility with lower temperature fabrication techniques that support the plastic substrate based device and circuit applications. This paper investigates the humidity dependence of performance of organic humidity sensor with Top-Contact and Bottom-Contact OTFTs. Subsequently, impact of channel length on sensor performance is analyzed. The humidity sensitivity of organic sensor drain current depends on the channel length and device structure. The performance analysis of top and bottom contact with bottom gate organic sensor is discussed in depth by varying the relative humidity in the range of 10% to 100% RH. The results are investigated using Silvaco ATLAS tool by considering pentacene as active layer material, PVA as dielectric material and PEDOT: PSS as electrodes material. From simulated results, it is observed that bottomcontact and long channel length organic sensor are more affected by humidity in comparison to top contact and short channel length.

Keywords: Organic humidity sensor, relative humidity, top-contact, bottom-contact, OTFTs

Cite this Article

Chandani Dubey, Brijesh Kumar. Performance Analysis of Fully Flexible Organic Humidity Sensor with TopContact and Bottom-Contact OTFTs. Journal of Semiconductor Devices and Circuits 2019; 6(1): 26–34p.