Enhancement of n‐Type Organic Field‐Effect Transistor Performances through Surface Doping with Aminosilanes

Abstract

Dopants, i.e., electronically active impurities, are added to organic semiconductor materials to control the material's Fermi level and conductivity, to improve injection at the device contacts, or to fill trap states in the active device layers and interfaces. In contrast to bulk doping as achieved by blending or co-deposition of dopant and semiconductor, surface doping has a lower propensity to introduce additional traps or scattering centers or to even alter the layer morphology relative to the undoped active material layers. In this study, the electrical effects of a very simple, post-device-fabrication surface doping process involving various amine group-containing alkoxysilanes on the performance of organic field-effect transistors (OFETs) made from the well-known n-type materials PTCDI-C8 and N2200 are researched. It is demonstrated that OFETs doped in such a way generally show enhanced characteristics (up to 10 times mobility increase and a significant reduction in threshold voltage) without any adverse effects on the devices' on/off ratio. It is also shown that the efficiency of the doping process is linked to the number of amine groups.

Synthesis and Characterization of Benzodithiophene (BDT) Quinoid Compounds as a Potential Compound for n-Type Organic Thin-Film Transistors (OTFT)

“…NMR of 4 ,8 -bis (decyloxy) benzo [1,2 -b: 4 , Jurnal Kimia Sains dan Aplikasi 23 ( 7 ) (2020): 261-266 5 . NMR of 4 ,8 -bis (hexyloxy) benzo [1,2 -b: 4 , 5-b ' ] dithiophene ( da )…”

“…NMR of 2,2 '-( 4 ,8 -bis (decyloxy) benzo [1,2 -b: 4 , 5-b ' ] dithiophene-2,6-diylidene) dimalononitrile (BDTQ . a 5 %weight loss, measured by TGA.…”

“…-10, both compounds have excellent thermal stability, as evidenced by their decomposition point above 290°C , as shown in Figure 2. Ogawa et al [ 14 ] reported that the anthra [2, 3 -b] thieno [2, 3 -d] thiophene (ATT) compound with a thermal decomposition value ( 5 % weight loss) of 290°C , could have mobility amounting to 0.012 cm 2…”

“…Organic semiconductor compounds have attracted many researchers because of their wide use, such as for solar panels [1], organic field-effect transistor (OFET) [2], dye-sensitized solar cell (DSSC) [ 3 ], and so forth. Among these uses, OFET attracts much attention and can be used as an alternative to inorganic materials [ 4 ].…”

“…Wu et al [11] developed a heterocyclic semiconductor named QFBPBP and obtained mobility ( p) of 4 cm 2 V -1 s _ 1 with a LUMO of -4.41 eV. Huang et al [12] succeeded in synthesizing Qdichloromethane-DPPTT, a pyropyrrole-based diciofene semiconductor with a LUMO value of -4.5 eV. Vegiraju et al [ 13 ] has reported a series of DTTQwith a LUMO value of -4.2 eV and the highest mobility of 0.29 cm 2…”