Applications and Sensing Mechanism of Pentacene-Based Thin Film Transistors for Primary Alcohol Analytes

• Main Authors: Chih-ChuanYang, 楊智銓
• Other Authors: Yeong-Her Wang
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/73604536284230652251

碩士 === 國立成功大學 === 微電子工程研究所碩博士班 === 101 === Applications and sensing mechanism of pentacene-based thin film transistors for primary alcohol analytes are fully discussed in this thesis. First, the resistances of sensors using load-connected transistors have high linearity with concentration of analytes, which have high correlation coefficient up to 0.98. Furthermore, the sensitivity increases with longer channel length for more grain boundaries in it. The mobility of transistors also has obvious decrease with different concentration of analytes. After injecting 3 ml propanol in the chamber of 9 liter, mobility decreases from 5.64 to 0.77 cm2s-1V-1. To clearly quantify the hopping rate affected by analytes stacked in grain boundaries, the intermolecular coupling (transfer integral) effect is verified through theoretical calculation of Davydov Splitting from Raman spectra and experimental results of ultraviolet/visible light (UV/VIS) spectra measurement. The hopping rate can be calculated from those measurement results by using Marcus-Hush equation. The model of Marcus-Hush equation provided well explanation in the mobility variation of transistors, and high correlation coefficient of 0.9887 was also calculated, indicating that this model can be applied in predicting the mobility trend while carriers in active layer via hopping and are influenced by grain boundaries. Finally, pentacene-based thin film transistors are also measured with different vaporizations of analytes, such as 1-pentanol, exhibiting suitable detectors for primary alcohol analytes.