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# Vertical natural electrochemical transistors for complementary circuits

### Supplies synthesis

The artificial path to the brand new polymers gDPP-g2T and Homo-gDPP is illustrated in Prolonged Information Fig. 1a. Until in any other case said, all reactions have been carried out beneath argon and the solvents have been used with none purification. The reagents 2,5,8,11,14-pentaoxahexadecan-16-yl 4-methylbenzenesulfonate (1)51, 3,6-di(thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (2)52 and 5,5′-bis(trimethyltin)-3,3′-bis(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)-2,2′-bithiophene (5)53 have been synthesized in response to beforehand reported procedures. Hexabutyldistannane (6) was bought from Sigma-Aldrich. The Cin-Cell ploymer was ready in response to our earlier publication54.

#### Synthesis of two,5-di(2,5,8,11,14-pentaoxahexadecan-16-yl)-3,6-di(thiophen-2-yl)-2,5-dihydropyr-rolo[3,4-c]pyrrole-1,4-dione (3)

Compound 1 (6.00 g, 14.76 mmol), compound 2 (1.84 g, 6.15 mmol), Ok2CO4 (4.25 g, 30.75 mmol) and 40 ml of dimethylformamide have been added to a 100 ml single-neck round-bottom flask. The response combination was purged with argon for 15 min and was then heated to 150 °C in a single day. After cooling to 25 °C, the solvent was eliminated beneath decreased strain. The residue was subsequent dissolved in chloroform and was then washed with water and brine 3 instances every. The natural part was then dried over anhydrous Na2SO4, filtered and the solvent was eliminated beneath vacuum to go away the crude product, which was then purified by silica gel chromatography, eluting with chloroform/methanol (100:1 to twenty:1). Compound 3 was obtained as a crimson strong (1.71 g; yield, 36%). 1H NMR (500 MHz, CDCl3, Prolonged Information Fig. 1b): δ (ppm) = 8.75 (d, J = 3.9 Hz, 2H), 7.64 (d, J = 5.0 Hz, 2H), 7.26 (dd, J = 5.0 Hz, 3.9 Hz, 2H), 4.26 (t, J = 6.3 Hz, 4H), 3.78 (t, J = 6.4 Hz, 4H), 3.66–3.51 (m, 32H), 3.36 (s, 6H). 13C NMR (126 MHz, CDCl3, Prolonged Information Fig. 1c): δ (ppm) = 161.54, 140.44, 134.78, 130.91, 129.68, 128.46, 107.89, 71.94, 70.72, 70.62, 70.60, 70.58, 70.57, 70.52, 68.94, 59.04, 41.88. Excessive-resolution mass spectrometry (HRMS) matrix-assisted laser desorption–ionization (MALDI): calcd for C36H52N2NaO12S2 (M + Na+): 791.2859; discovered, 791.2851.

#### Synthesis of three,6-bis(5-bromothiophen-2-yl)-2,5-di(2,5,8,11,14-pentaoxahexadecan-16-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (4)

Compound 3 (1.00 g, 1.30 mmol) was dissolved in 30 ml of chloroform in a 100 ml single-neck round-bottom flask. The response combination was cooled to 0 °C and N-bromosuccinimide  (0.48 g, 2.73 mmol) was added in a single portion beneath argon. The response combination was slowly warmed to room temperature and was stirred in a single day at nighttime. Water (100 ml) was added and the resutling resolution was stirred for 30 min. The natural layer was separated and was dried over anhydrous Na2SO4, filtered and the solvent was eliminated beneath vacuum to go away a residue that was purified by silica gel chromatography with chloroform/methanol (100:1 to 50:1). Compound 4 was obtained as a purple strong (0.86 g, yield 71%). 1H NMR (500 MHz, CDCl3, Prolonged Information Fig. 1d): δ (ppm) = 8.48 (d, J = 4.2 Hz, 2H), 7.20 (d, J = 4.2 Hz, 2H), 4.16 (t, J = 6.0 Hz, 4H), 3.76 (t, J = 6.0 Hz, 4H), 3.66–3.51 (m, 32H), 3.36 (s, 6H). 13C NMR (126 MHz, CDCl3, Prolonged Information Fig. 1e): δ (ppm) = 161.26, 139.48, 134.86, 131.41, 131.12, 119.35, 107.97, 71.93, 70.76, 70.61, 70.58, 70.56, 70.50, 68.94, 59.03, 42.24, 29.60. HRMS (MALDI): calcd for C36H50Br2N2NaO12S2 (M + Na+): 949.1049; discovered, 949.1044.

#### Synthesis of polymer gDPP-g2T

Compound 4 (92.67 mg, 0.10 mmol), compound 5 (81.62 mg, 0.1 mmol), Pd2(dba)3 (3.00 mg) and P(o-tol)3 (7.60 mg) have been added to a ten ml response vessel. After the response combination was pump–purged for 3 cycles with argon, anhydrous toluene (1.5 ml) and dimethylformamide (1.5 ml) have been added. The sealed vessel was subsequent heated at 110 °C for 12 h. The polymer was then end-capped with 20 μl of 2-(tributylstannyl)-thiophene after which 50 μl of 2-bromothiophene, with every step being carried out at 110 °C for 1 h. After cooling to room temperature, the combination was poured into 100 ml of MeOH + 1 ml of concentrated HCl. The ensuing precipitate was collected by filtration after which purified by Soxhlet extraction utilizing methanol, acetone, hexane after which chloroform. The chloroform portion was concentrated after which poured into MeOH (roughly 100 ml). The ensuing precipitate was collected by vacuum filtration as a black strong (106.51 mg, yield 86%).1H NMR (500 MHz, C2D2Cl4, Prolonged Information Fig. 1f): δ (ppm) = 8.73–8.69 (br, 2H), 7.43–6.84 (br, 4H), 4.34–4.25 (br, 8H), 3.94–3.45 (m, 56H), 3.29 (s, 12H). Anal. calcd for [C58H84N2O20S4]n: C, 55.40; H, 6.73; N, 2.23. Discovered: C, 55.41; H, 6.67; N, 2.37.

#### Synthesis of polymer Homo-gDPP

The polymer Homo-gDPP was synthesized through the use of the identical methodology as used for gDPP-g2T. Compound 4 (199.00 mg, 0.21 mmol), compound 6 (124.57 mg, 0.21 mmol), Pd2(dba)3 (5.00 mg) and P(o-tol)3 (13.00 mg) have been used as beginning supplies. The pure polymer was obtained as a black strong (100.00 mg, yield 62%). 1H NMR (500 MHz, C2D2Cl4, Prolonged Information Fig. 1g): δ (ppm) = 8.91–8.69 (br, 2H), 7.43–7.22 (br, 2H), 4.25 (br, 4H), 3.78–3.54 (br, 36H), 3.46 (br, 6H). Anal. calcd for [C36H52N2O12S2]n: C, 56.23; H, 6.82; N, 3.64. Discovered: C, 56.26; H, 6.83; N, 3.76.

### Supplies characterization

The 1H and 13C NMR spectra of the intermediates have been recorded on a Bruker Ascend 500 MHz spectrometer through the use of deuterochloroform (CDCl3) because the solvent at room temperature. The 1H spectra of the polymers have been recorded on a Bruker Ascend 500 MHz spectrometer through the use of dideutero-1,1,2,2-tetrachloroethane (C2D2Cl4) at 100 °C, which was additionally used to estimate the molecular weight. The purity of the polymers was verified by elemental evaluation carried out at Midwest Microlabs Inc.

#### VT–NMR and Mn estimation by end-group evaluation

The options for the NMR experiments have been ready by dissolving roughly 5 mg of polymer in 0.7 ml of C2D2Cl4. The options have been heated at 100 °C for 16 h earlier than the measurements have been taken to make sure full dissolution of the polymer. The measurements have been carried out on a 400 MHz Bruker Avance III HD Nanobay at 100 °C, and the spectra have been referenced to C2DHCl4 at 5.90 ppm. Finish-groups have been recognized based mostly on literature compounds of comparable construction55,56. Calculation of the Mn from the end-group evaluation relies on equation (1), which is described within the literature57.

$${n}_{x}=frac{{a}_{x}{m}_{y}{n}_{y}}{{a}_{y}{m}_{x}}$$

(1)

the place ax is the corrected variety of repeat unit protons, my is the variety of end-group protons used for the calculation, ay is the world of the end-group protons and mx is he variety of repeat unit protons.

For Homo-gDPP: nx= [(10.65)(2)(2)]/[(1)(2)] = 21.3 ≈ 21 and Mn = (21 × 0.76893) = 16.4 kDa.

For gDPP-g2T: nx = [(16.8)(2)(2)]/[(1)(2)] = 33.6 ≈ 34 and Mn = (34 × 1.16744) = 39.7 kDa.

### OECT and complementary circuit fabrication

#### Semiconductor resolution preparation

The gDPP-g2T, Homo-gDPP and Cin-Cell have been first dissolved in chloroform at a focus of 20 mg ml−1 and have been filtered by a 0.45 µm polyvinylidene difluoride filter. Then, the gDPP-g2T or Homo-gDPP resolution was combined with the Cin-Cell resolution in a quantity ratio of 9:2 for machine fabrication through the use of the blends. For Pg2T-T, PIBET-AO, PEG-N2200 and BTI2, they have been additionally first dissolved in chloroform at a focus of 20 mg ml−1 and have been filtered by a 0.45 µm polyvinylidene difluoride filter, then combined with the Cin-Cell resolution in a quantity ratio of 9:2. For PEDOT:PSS (Xi’an Polymer Mild Know-how Corp.), an answer containing 1 ml of PH1000 (strong content material roughly 1.3%, PEDOT content material roughly 0.37%), 1 polyethylene glycol dimethacrylate (1.2:1 weight ratio versus PEDOT), 5 wt% of Irgacure 2959 (versus polyethylene glycol dimethacrylate) and 1 wt% of Capstone FS-30 (versus PH1000)58 was ready.

#### Standard OECT fabrication

A Si wafer with a 300-nm-thick SiO2 layer was used because the substrate. It was ultrasonically cleaned, first in an isopropyl alcohol bathtub for 20 min after which with oxygen plasma for five min. The S1813 photoresist was spin-coated at 4,000 rpm for 45 s, adopted by annealing at 110 °C for 60 s and was then uncovered beneath a maskless aligner system (MLA150; Heidelberg Devices), developed in AZ400k (Microchemicals) for 40 s, rinsed with deionized water and blow-dried. Subsequent, 3 nm of Cr and 50 nm of Au have been deposited by thermal evaporation and have been developed by soaking in acetone for five min to take away the S1813. Right here, the patterned planar Au supply–drain electrodes outlined the channel dimension of W = 100 μm and L = 10 μm. The p- or n-type semiconductor mix resolution was then spin-coated at 3,000 rpm for 20 s and was UV cross-linked for 30 s (Inpro Applied sciences F300S). Eventually, a droplet (roughly 1–20 µl, based mostly on the channel space) of phosphate buffer resolution (PBS, 1×) was utilized onto the electrode overlapping space, and an Ag/AgCl electrode was inserted within the droplet appearing because the OECT gate electrode. For the well-patterned cOECTs, the fabrication course of could be discovered within the literature59, and the gadgets have patterned semiconductor areas (100 × 20 µm2, wherein the channel size is 10 µm, the channel width is 100 µm, the channel thickness is 100 nm and the overlap with the supply and/or drain is 5 μm on either side) and encapsulated supply–drain electrodes.

#### Complementary inverter fabrication

An illustration of the fabrication course of could be present in Prolonged Information Fig. 9a. For the inverter fabrication, a layer of the other kind of semiconductor mix was spin-coated (3,000 rpm for 20 s) instantly onto the primary vOECT (earlier than making use of the PBS electrolyte and the Ag/AgCl electrode), and was UV cross-linked for 30 s. Subsequent, the third Au electrode (150 nm) was evaporated with a shadow masks as describe above. Be aware that the third Au electrode was rigorously aligned to overlap with the energetic space of the underside vOECT. Lastly, a droplet (roughly 1–20 µl, based mostly on the channel space) of PBS (×1) was utilized on the electrode overlapping space, and an Ag/AgCl electrode was inserted within the droplet appearing as VIN of the inverter.

### System characterization

#### Transistor measurement

{The electrical} characterization of the OECTs and inverters was carried with an Agilent B1500A semiconductor parameter analyser in ambient situations. The voltage sweeping pace was 0.1 V s−1 for the OECT measurements. For the transistor and inverter biking checks, the voltage pulse was generated by a Keysight waveform generator (33500B), whereas the present–voltage variation was monitored with an Agilent B1500A. Through the biking checks, to take care of a comparatively steady PBS electrolyte focus, a PDMS mould was positioned on high of the machine energetic space to restrict the electrolyte displacement and to gradual water evaporation. Transient time measurements have been carried out with an FS-Professional (PDA) semiconductor parameter analyser. For the ring oscillator characterization, a relentless VDD of +0.7 V was utilized with an Agilent B1500A, and the VOUT was monitored by an oscilloscope (Tektronix, TDS 2014). For NAND and NOR characterization, sq. pulses (from 0.0 to ±0.7 V) with a frequency of 5 Hz and 10 Hz have been utilized as VIN-A and VIN-B, respectively, by a Keysight waveform generator (33500B), and VOUT was monitored by an Agilent B1500A. For rectifier characterization, two sinusoidal VIN (VIN+ and VIN− have a part distinction of 180°) with an amplitude of 0.35 V have been generated by a Keysight waveform generator (33500B), and the VOUT was monitored by an Agilent B1500A. All measurements have been carried out in ambient situations.

#### EIS measurements

All measurements have been performed through the use of a PalmSens4 potentiostat (PalmSens) with an Ag/AgCl pellet (Warner Devices) because the reference and counter electrode, and a gold electrode coated with energetic supplies because the working electrode. For measurements on the vertical construction, particulars could be present in Prolonged Information Fig. 7, which have been carried out in PBS (1×) electrolyte with a direct present offset as 0.5 V (for the p-type materials) and −0.7 V (for the n-type materials), superimposed by a ten mV alternating present (a.c.) oscillation. The frequency of the a.c. oscillation ranges from 0.1 to 105 Hz.

#### Bandwidth measurements

Bandwidth measurements have been performed by accessing the gm of the OECT as a perform of the frequency of the gate voltage oscillation. The Nationwide Devices (NI) SMU unit (NI PXIe-4143) was used for sourcing and measuring the drain–supply voltage and present, in addition to the gate present. The gate voltage was utilized through the use of the info acquisition (DAQ) card from NI (NI PXIe-6363)] and was measured with a NI BNC-2110. Through the measurement, VDS is the same as −0.5 V (p-type) and 0.5 V(n-type), whereas VG is the same as −0.5 V (p-type) and 0.7 V (n-type), superimposed by a ten mV a.c. oscillation. The frequency of the a.c. oscillation ranges from 1 to 104 Hz. All measurements have been automated through the use of a customized LabVIEW programme (NI) and the info have been processed through the use of the MATLAB software program (Mathworks).

### Semiconductor movie characterization

SEM characterizations have been carried out on a Hitachi SU8030 FE-SEM. AFM characterizations have been acquired with a Bruker ICON System. GIWAXS measurements have been carried out at Beamline 8-ID-E1 on the Superior Photon Supply (APS) at Argonne Nationwide Laboratory. Samples have been irradiated with a ten.9 keV X-ray beam at an incidence angle 0.125° to 0.135° in a vacuum for 2 summed exposures of two.5 s (totalling 5 s of publicity), and scattered X-rays have been recorded by a Pilatus 1 M detector situated 228.16 mm from the pattern at two totally different heights.

### Dialogue of the calculated mobilities of cOECT and vOECTs

The provider mobilities of each the gDPP-g2T:Cin-Cell and Homo-gDPP:Cin-Cell have been measured in vertical and planar OECTs59. For the planar or standard structure, the provider mobility of the p-type cOECT is discovered to be 1.69 ± 0.19 cm2 V−1 s−1, which is similar to different high-performance p-type OECTs. The n-type cOECT displays a excessive mobility of 0.13 ± 0.03 cm2 V−1 s−1, which is among the many highest reported up till now. Nonetheless, for the vertical gadgets, the calculated provider mobilities are a lot decrease, (3.33 ± 0.27) × 10−3 cm2 V−1 s−1 and (3.06 ± 0.61) × 10−3 cm2 V−1 s−1 for the p-type and n-type vOECTs, respectively.

The a lot decrease and related provider mobilities within the vOECTs in all probability originate from the massive sequence resistance from the supply–drain electrodes and, to a lesser extent, the non-optimal polymer morphology of the spin-coated movies, which usually enhances in-plane somewhat than out-of-plane natural semiconductor cost transport. As a result of the measured channel resistance within the vertical construction within the on-state is lower than 10 Ω, sequence resistances originating on the electrode–semiconductor interface and throughout the electrode contact will cut back the measured drain present notably16. General, these observations point out that additional optimization of cost injection and connecting-line conductivity, and using natural semiconductors that favour vertical cost transport as in these for natural photovoltaics, will in all probability improve the present densities even additional. However, to correctly consider the true provider mobilities for the unconventional vertical structure reported right here, extra modelling and simulation efforts are required. This may be of nice curiosity to all the group.

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