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Influence of thermal treatment on the performance of copper phthalocyanine thin-film transistors
Xueyan Tian,Zheng Xu,Fujun Zhang,Suling Zhao,Guangcai Yuan,Jing Li,Qinjun Sun,Ying Wang 한국물리학회 2010 Current Applied Physics Vol.10 No.1
Organic thin-film transistors (OTFTs) with bottom-gate and bottom-contact configuration based on copper phthalocyanines (CuPc) as active layer were fabricated. The performance of CuPc OTFTs was studied before and after thermal treatment on CuPc layer. The values of the threshold voltage before and after thermal treatment are -6.3 and -5.7 V, respectively. The field-effect mobility values in saturation regime of CuPc thin-film transistors before and after thermal treatment are 0.014 ㎠/Vs and 0.0068 ㎠/Vs,respectively. The experimental results indicate that there is a heavy decay on the mobility of CuPc based OTFTs mostly due to the crystalline morphology change induced by the thermal treatment, and absolute value of the threshold voltage after thermal treatment decreases with the decrease of the CuPc film thickness and the roughness.