Date

Place

[8-4]
15:15 ~ 15:30
Title:The Study of Flexible Polymer TFT with Soluble DPP-Based Organic Semiconductor for Ammonia Gas Sensor
Gi-Seong Ryu and Yong-Young Noh (Dongguk Univ., Korea)
Abstract: We fabricated the flexible polymer TFT on plastic subsrate for gas sensor.The BG/TC P-29-DPP-SVS OFETs on a PEN substrate was used as flexible ammonia (NH3) gas sensors. As the concentration of NH3 increased, the channel resistance of P-29-DPP-SVS OFETs increased approximately 100 times from ~ 107 to ~ 109 �� at VDS = -5 V and VGS = -5 V. Also, the electrical characteristics of P-29-DPP-SVS (p-channel) and P(NDI2OD-T2) (n-channel) OFET sensors were measured in the air and in ambient NH3. The n-channel OFETs with P(NDI2OD-T2) showed an opposite trend compared with n-channel OFETs with P-29-DPP-SVS. Most conjugated polymers are doped/undoped by redox reactions in which their doping level can be altered by transferring electrons to or from the analytes. NH3 is known as an electron-donor for conjugated polymers. Therefore, p-channel OFETs showed increased channel resistance upon exposure to NH3 gas, whereas n-channel OFETs showed the opposite trend.
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