A photo-responsive organic electrochemical transistor

Turetta, Nicholas; Cusin, Luca; Livio, Pietro Antonio; Hallani, Rawad K.; McCulloch, Iain; Samorı́, Paolo

doi:10.1039/d2tc05444b

“…The half‐life of the merocyanine of S2 in THF was relatively short (estimated t 1/2 ~3.6 mins. at 5 °C and 35 s at 20 °C; Figure S23 and S24), which is typical for merocyanines in low‐polarity solvents [69] . Control experiments indicated that irradiation of the o ‐fluorinated azobenzene S1 at this wavelength (300 nm) does not result in any appreciable degree of isomerization (Figure S19 and S20).…”

Section: Figurementioning

confidence: 82%

“…at 5 °C and 35 s at 20 °C; Figure S23 and S24), which is typical for merocyanines in low-polarity solvents. [69] Control experiments indicated that irradiation of the o-fluorinated azobenzene S1 at this wavelength (300 nm) does not result in any appreciable degree of isomerization (Figure S19 and S20). Hence, the wavelength-selectivity in this dyad stems not only from band separation (Figure S26) but also due to significant differences in the efficiency of the photoisomerization at the selected wavelengths.…”

mentioning

confidence: 97%

Orthogonal Photoswitching in a Porous Organic Framework

Sheng,

Perego,

Bracco

et al. 2024

Angewandte Chemie

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The development of photoresponsive systems with non‐invasive orthogonal control by distinct wavelengths of light is still in its infancy. In particular, the design of photochemically triggered‐orthogonal systems integrated into solid materials that enable multiple dynamic control over their properties remains a longstanding challenge. Here we report the orthogonal and reversible control of two types of photoswitches in an integrated solid porous framework, that is, visible‐light responsive o‐fluoroazobenzene and nitro‐spiropyran motifs. The properties of the constructed material can be selectively controlled by different wavelengths of light thus generating four distinct states providing a basis for dynamic multifunctional materials. Solid state NMR demonstrated the selective transformation of the azobenzene switch in the bulk which in turn modulates N2 and CO2 adsorption.

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“…The most recent work (2023) demonstrated photo-responsive OECTs created via pre-patterned Au electrodes and drop-cast solutions of pgBTTT blended with other materials, also dissolved in chloroform. [31] This study reports on the combination of printing technologies to create all-printed accumulation mode OECTs. The ptype semiconducting conjugated polymer pgBTTT was inkjet printed to create the OECT channels, while the remaining layers were screen printed to complete the vertically stacked OECT devices.…”

Section: Introductionmentioning

confidence: 99%

“…The most recent work (2023) demonstrated photo‐responsive OECTs created via pre‐patterned Au electrodes and drop‐cast solutions of pgBTTT blended with other materials, also dissolved in chloroform. [ 31 ]…”

Section: Introductionmentioning

confidence: 99%

Toward Sustainability in All‐Printed Accumulation Mode Organic Electrochemical Transistors

Makhinia,

Bynens,

Goossens

et al. 2024

Adv Funct Materials

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This study reports on the first all‐printed vertically stacked organic electrochemical transistors (OECTs) operating in accumulation mode; the devices, relying on poly([4,4′‐bis(2‐(2‐(2‐methoxyethoxy)ethoxy)ethoxy)‐2,2′‐bithiophen‐5,5′‐diyl]‐alt‐[thieno[3,2‐b]thiophene‐2,5‐diyl]) (pgBTTT) as the active channel material, are fabricated via a combination of screen and inkjet printing technologies. The resulting OECTs (W/L ≈5) demonstrate good switching performance; gm, norm ≈13 mS cm−1, µC* ≈21 F cm−1 V−1 s−1, ON–OFF ratio > 104 and good cycling stability upon continuous operation for 2 h. The inkjet printing process of pgBTTT is established by first solubilizing the polymer in dihydrolevoglucosenone (Cyrene), a non‐toxic, cellulose‐derived, and biodegradable solvent. The resulting ink formulations exhibit good jettability, thereby providing reproducible and stable p‐type accumulation mode all‐printed OECTs with high performance. Besides the environmental and safety benefits of this solvent, this study also demonstrates the assessment of how the solvent affects the performance of spin‐coated OECTs, which justifies the choice of Cyrene as an alternative to commonly used harmful solvents such as chloroform, also from a device perspective. Hence, this approach shows a new possibility of obtaining more sustainable printed electronic devices, which will eventually result in all‐printed OECT‐based logic circuits operating in complementary mode.

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Orthogonal Photoswitching in a Porous Organic Framework

Sheng,

Perego,

Bracco

et al. 2024

Angew Chem Int Ed

Self Cite

10

0

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The development of photoresponsive systems with non‐invasive orthogonal control by distinct wavelengths of light is still in its infancy. In particular, the design of photochemically triggered‐orthogonal systems integrated into solid materials that enable multiple dynamic control over their properties remains a longstanding challenge. Here we report the orthogonal and reversible control of two types of photoswitches in an integrated solid porous framework, that is, visible‐light responsive o‐fluoroazobenzene and nitro‐spiropyran motifs. The properties of the constructed material can be selectively controlled by different wavelengths of light thus generating four distinct states providing a basis for dynamic multifunctional materials. Solid state NMR demonstrated the selective transformation of the azobenzene switch in the bulk which in turn modulates N2 and CO2 adsorption.

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A photo-responsive organic electrochemical transistor

Abstract: The design of novel organic electrochemical transistor (OECT) channel materials that can be controlled by a whole range of external stimuli is key towards the emergence of unprecedented technologies in...

Cited by 8 publications

References 49 publications

Orthogonal Photoswitching in a Porous Organic Framework

Orthogonal Photoswitching in a Porous Organic Framework

Toward Sustainability in All‐Printed Accumulation Mode Organic Electrochemical Transistors

Orthogonal Photoswitching in a Porous Organic Framework

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