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Significance of the double-layer capacitor effect in polar rubbery dielectrics and exceptionally stable low-voltage high transconductance organic transistors

par Wang, Chao;Lee, Wen-Ya;Kong, Desheng;Pfattner, Raphael;Schweicher, Guillaume ;Nakajima, Reina;Lu, Chien;Mei, Jianguo;Lee, Tae Hoon;Wu, Hung-Chin;Lopez, Jeffrey;Diao, Ying;Gu, Xiaodan;Himmelberger, Scott;Niu, Weijun;Matthews, James R.;He, Mingqian;Salleo, Alberto;Nishi, Yoshio;Bao, Zhenan
Référence Scientific Reports, 5, 17849
Publication Publié, 2015-12-14

Article révisé par les pairs

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Résumé :

Both high gain and transconductance at low operating voltages are essential for practical applications of organic field-effect transistors (OFETs). Here, we describe the significance of the double-layer capacitance effect in polar rubbery dielectrics, even when present in a very low ion concentration and conductivity. We observed that this effect can greatly enhance the OFET transconductance when driven at low voltages. Specifically, when the polar elastomer poly(vinylidene fluoride-co-hexafluoropropylene) (e-PVDF-HFP) was used as the dielectric layer, despite a thickness of several micrometers, we obtained a transconductance per channel width 30 times higher than that measured for the same organic semiconductors fabricated on a semicrystalline PVDF-HFP with a similar thickness. After a series of detailed experimental investigations, we attribute the above observation to the double-layer capacitance effect, even though the ionic conductivity is as low as 10–10 S/cm. Different from previously reported OFETs with double-layer capacitance effects, our devices showed unprecedented high bias-stress stability in air and even in water.