Organic field-effect transistors as new paradigm for large-area molecular junctions

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• 作者：Stefano Casalini^a ; ^{s.casalini@bo.ismn.cnr.it} ; Arian Shehu^a ; Silvia Destri^b ; William Porzio^b ; Maria Cecilia Pasini^b ; Francesco Vignali^b ; Francesco Borgatti^a ; Cristiano Albonetti^a ; Francesca Leonardi^c ; ^a ; Fabio Biscarini^a
• 关键词：SAM ; OFET ; Charge injection ; Molecular junction
• 刊名：Organic Electronics
• 出版年：2012
• 期刊代码：137_15661199
• 类别：et
• 出版时间：May, 2012
• 卷：13
• 期：5
• 页码：789-795
• 文件大小：986 K

摘要

Self-Assembly Monolayers (SAMs) are considered a promising route for solving technological hindrances (such as bias-stress, contact resistance, charge trapping) affecting the electrical performances of the Organic Field-Effect Transistors (OFETs). Here we use an OFET based on pentacene thin film to investigate the charge transport across conjugated SAMs at the Au/pentacene interface. We synthesized a homolog series of 蟺-conjugated molecules, termed Tn-C8-SH, consisting of a n-unit oligothienyl Tn (n = 1鈥?) bound to an octane-1-thiol (C8-SH) chain that self-assembles on the Au electrodes. The multi-parametric response of such devices yields an exponential behavior of the field-effect mobility (渭), current density (J), and total resistivity (R), due to the SAM at the charge injection interface (i.e. Au-SAM-pentacene). The surface treatment of the OFETs induces a clear stabilization of different parameters, like sub-threshold slope and threshold voltage, thanks to standardized steps in the fabrication process.