The effect of the donor moiety of DPP based polymers on the performance of organic electrochemical transistors

Abstract

Two D–A type polymers based on the gTDPP as the acceptor and gTVT and gTBTT as the donor have been developed. The donor unit affects the backbone curvature and the aggregation properties of the mixed conductors, regulating their performance in OECTs.

The Role of Long‐Alkyl‐Group Spacers in Glycolated Copolymers for High‐Performance Organic Electrochemical Transistors

“…[4] The V Th indicates Each datapoint represents a device and the additional datapoints marked as gray diamonds in (b) are taken from the literature for comparison with other similar copolymers. [26][27][28]34] The statistical box plot with individual device data points show the device-to-device variation including a mean line, box data range of 25-75% and whiskers of max and min values. d) The effective capacitance per unit area (C eff ) at 1Hz extracted using a modified Randles' cell equivalent circuit R s (Q p ||R p ) shown in the Supporting Information.…”

“…Figure 1. a) Chemical structures of the four DPP copolymers: DPP-TTT, gDPP-TTT, DPP-TTVTT, and gDPP-TTVTT. b,c) OECT transconductances taken from the derivative of the transfer characteristics, normalized by Wd/L (where W is width, L is length, and d is thickness of channel) and using 2 types of electrolytes: b) Ringer's solution (2mm/200 µm -W/L) and c) 0.1 m tetrabutylammonium hexafluorophosphate (TBAPF 6 ) acetonitrile electrolyte (100/10 µm -W/L).Each datapoint represents a device and the additional datapoints marked as gray diamonds in (b) are taken from the literature for comparison with other similar copolymers [26][27][28]34]. The statistical box plot with individual device data points show the device-to-device variation including a mean line, box data range of 25-75% and whiskers of max and min values.…”

Green Synthesis of Lactone‐Based Conjugated Polymers for n‐Type Organic Electrochemical Transistors

“…Most OECTs developed so far are built using p-type conjugated polymers (hole conductors) as core components. [9][10][11][12][13][14][15][16][17] In contrast to n-type materials (electron conductors), p-type conjugated polymers offer to date better device performance, with μC* over 300 F cm −1 V −1 s −1 for, as an example, all p(g2T2-g4T2)-based polymers, [18] poly(2-(4,4′-bis(2-methoxyethoxy)-5′-methyl-[2,2′bithiophen]-5-yl)-5-methylthieno [3,2-b]thiophene) p(gBTTT), [19] and p(DPP-T2)-based donor-acceptor (D-A) copolymers. [20] The superior performance is ascribed to their better stability in contact with air or aqueous media, higher charge carrier mobility, and/or electrochemical stability with respect to n-type polymers.…”

Cyano‐Functionalized n‐Type Polymer with High Electron Mobility for High‐Performance Organic Electrochemical Transistors

“…[24] Till now, tremendous progress has been made in developing high-performance p-type (hole-transporting) OECT channel material, μC* of several hundred F cm −1 V −1 s −1 is reported for several p-type polymers. [25][26][27][28][29][30][31][32][33][34][35][36][37] For example, a remarkable μC* >500 F cm −1 V −1 s −1 has been achieved in polymer pgBTTT [29] with a high hole mobility of 3.44 cm 2 V −1 s −1 and C* of 164 F cm −3 . In contrast, the progress in developing n-type (electron-transporting) OECT channel material has greatly lagged behind.…”

“…For n-type polymers, via hydrophilic side-chain and/ or backbone structure engineering, high C* of several hundred F cm −3 can be achieved which is on par with the p-type polymers. Nonetheless, their OECT electron mobilities (μ e,OECT s) are much lower compared to the hole mobilities (μ h,OECT s, typically >0.1-1 cm 2 V −1 s −1 ), [25][26][27][28][29][30][31][32][33][34] ranging from 10 −5 to 10 −2 cm 2 V −1 s −1 with the highest value being 0.069 cm 2 V −1 s −1 in polymer p(C-T). [46] Therefore, it is highly challenging to simultaneously yield high electron mobility and ion transport capability to improve the μC* for n-type polymers.…”