Discontinuous pn-Heterojunction for Organic Thin Film Transistors

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• 作者：Boeun Cho ; Seong Hun Yu ; Minwoo Kim ; Moo Hyung Lee ; Wansoo Huh ; Jiyoul Lee ; Jungwook Kim ; Jeong Ho Cho ; Jun Young Lee ; Young Jae Song ; Moon Sung Kang
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：August 7, 2014
• 年：2014
• 卷：118
• 期：31
• 页码：18146-18152
• 全文大小：416K
• ISSN：1932-7455

文摘

Utilization of discontinuous pn-oragnic heterojunction is introduced as a versatile method to improve charge transport in organic thin film transistors (OTFTs). The method is demonstrated by depositing n-type dioctyl perylene tetracarboxylic diimide (PTCDI-C₈) discontinuously onto base p-type pentacene OTFTs. A more pronounced impact of the discontinuous upper layer is obtained on the transistor performances when thinner base layers are employed; a >100-fold enhancement in hole mobility and a >20 V shift in threshold voltage are achieved after applying PTCDI-C₈ discontinuously onto 2 nm thick pentacene thin films. Local surface potential measurements (Kelvin-probe force microscopy) and temperature-dependent transport measurements (77鈥?00 K) reveal that the interfacial dipole formed at the pn-heterostructures effectively dopes the base pentacene films p-type and leads to a reduction in transport activation energy.