Side-chain effect of organic semiconductors in OFET-based chemical sensors

Liu, Dapeng; Wu, Xiaohan; Huang, Jia

doi:10.1007/s40843-017-9121-y

Cited by 20 publications

(14 citation statements)

References 42 publications

(44 reference statements)

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“…[36,37] The idea was based on the possibility of chain stacking (crystalline) changes according to the side (alkyl) groups attached to the main polymer backbones. [38][39][40] For this purpose, 2,5-bis-(2-octyldodecyl)-3,6-bis-(5-trimethylstannanylthiophen-2-yl)-2,5-dihydro-pyrrolo [3,4-c]pyrrole-1,4-dione (2Sn-ODTPPD) was reacted with 4,7-dibromo-2,1,3-benzothiadiazole (2Br-BT) in the presence of a Stille coupling catalyst. The resulting conjugated polymer, poly[{2,5-bis-(2-octyldodecyl)-3,6-bis-(thien-2yl)-pyrrolo [3,4-c]pyrrole-1,4-diyl}-co-{2,2′-(2,1,3-benzothiadiazole)-5,5′-diyl}] (PODTPPD-BT), exhibited strong optical absorptions in the NIR range.…”

Section: Introductionmentioning

confidence: 99%

Near‐Infrared Organic Phototransistors with p‐Channel Photosensitive Layers of Conjugated Polymer Composed of bis‐Octyldodecyl‐Diketopyrrolopyrrole and Benzothiadiazole Units

Park

Lee

Kim

et al. 2020

Adv Elect Materials

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A near‐infrared (NIR)‐absorbing conjugated polymer, poly[{2,5‐bis‐(2‐octyldodecyl)‐3,6‐bis‐(thien‐2‐yl)‐pyrrolo[3,4‐c]pyrrole‐1,4‐diyl}‐co‐{2,2′‐(2,1,3‐benzothiadiazole)‐5,5′‐diyl}] (PODTPPD‐BT), which is synthesized via a Stille coupling reaction, can play a dual role (charge transport and sensing) in NIR‐sensing organic phototransistors (OPTRs). The PODTPPD‐BT films, which feature two strong optical absorption peaks at wavelengths (λ) of 830 and 935 nm, possess a highly ordered crystalline state as evidenced by the synchrotron radiation grazing incidence X‐ray diffraction (GIXD) method. The OPTRs with the PODTPPD‐BT layers show typical p‐channel transistor behaviors in the dark, while their best dark performance is measured at a PODTPPD‐BT thickness (t) of 85 nm. The highest overall photocurrent is measured at t = 85 nm under illumination with three monochromatic NIR lights, while the highest photoresponsivity (RC) is obtained for the thickest PODTPPD‐BT layers (t = 145 nm). The flexible OPTRs with the PODTPPD‐BT layers demonstrate stable sensing characteristics upon optical on/off modulations using a high‐power NIR laser diode (λ = 905 nm) used for actual light detection and ranging (LiDAR) systems.

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Section: Introductionmentioning

confidence: 99%

Near‐Infrared Organic Phototransistors with p‐Channel Photosensitive Layers of Conjugated Polymer Composed of bis‐Octyldodecyl‐Diketopyrrolopyrrole and Benzothiadiazole Units

Park

Lee

Kim

et al. 2020

Adv Elect Materials

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“…Air stability is one of the most important issues for meeting the requirements in practical applications [17][18][19][20][21]. In previous studies, organic materials affected by air environment have been widely studied [22,23]. It has been reported that for gate dielectric materials with active functional groups, such as hydroxyl groups, the interaction with the adsorbed water in air would affect the device performance [24,25], leading to performance degradation in air [26,27].…”

Section: Introductionmentioning

confidence: 99%

The effect of air exposure on device performance of flexible C8-BTBT organic thin-film transistors with hygroscopic insulators

Xie

Liu

et al. 2020

Sci. China Mater.

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Organic thin film transistors (OTFTs) are normally sensitive to ambient conditions and show performance degradation in air. On the contrary, the performance of flexible 2,7-dioctyl[1] benzothieno [3,2-b][1]benzothiophene (C8-BTBT) OTFTs using cross-linked polymer layer, poly(4vinyl-phenol)-4,4'-(hexafluoroisopropylidene) diphthalic anhydride (PVP-HDA), as the dielectric layer can be improved in air conditions with 40% relative humidity. Under soaking in air with 40% relative humidity, the electrical behavior, surface morphology, and contact angle of the flexible C8-BTBT OTFTs using PVP-HAD as dielectric layer with three different thicknesses were investigated. It is found that, when the devices with 375 nm-thick PVP-HDA films are placed in 40% relative humidity air conditions for 6 h, the corrected average mobility (µ) can increase from 3.2 to 5.1 cm 2 V −1 s −1. Furthermore, the average threshold voltage (V th) changes from −12.4 to −9.3 V while keeping a constant ratio of I on /I off = 10 4. These results indicate that the flexible C8-BTBT OTFTs with PVP-HDA dielectric layer exhibit interesting application prospects.

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“…There are about half a billion automobiles on the roads every day. This makes people's lives more convenient but also generates large amounts of pollutant gases, such as carbon monoxide (CO), nitric oxide (NO), ammonia (NH 3 ), and volatile organic com-pounds (VOCs) [4][5][6][7][8][9][10][11][12]. None of NH 3 , CO, or NO can be detected by the human senses.…”

Section: Introductionmentioning

confidence: 99%

A self-powered gas sensor based on PDMS/Ppy triboelectric-gas-sensing arrays for the real-time monitoring of automotive exhaust gas at room temperature

Zhang

Zhao

et al. 2019

Sci. China Mater.

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A new self-powered active gas sensor for realtime monitoring of automotive exhaust gas was devised. The pipe-shaped device was fabricated from polydimethylsiloxane/ polypyrrole (PDMS/Ppy) triboelectric gas-sensing unit arrays. The gas-sensing units can actively convert the mechanical energy of gas flow into a triboelectric current. The output current signal depends on the species and concentrations of the target chemical gases (CO, NH 3 , NO) in the gas flow, and thus can be used as a sensing signal. The device consists of seven gas-sensing units with different Ppy derivatives. As the different sensing units respond to the gases in different ways, the device can differentiate between gas species. The working mechanism is attributed to the coupling effect between the triboelectric effect of PDMS/Ppy and the gas-sensing properties of Ppy. The device can be installed in the tailpipe of an automobile, and can thus analyze the exhaust gas in real time without the need for any external electrical power. The results of the present study spur a new research direction for the development of automotive exhaust gas monitoring systems, thus playing an important role in the detection of air pollution.

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Side-chain effect of organic semiconductors in OFET-based chemical sensors

Cited by 20 publications

References 42 publications

Near‐Infrared Organic Phototransistors with p‐Channel Photosensitive Layers of Conjugated Polymer Composed of bis‐Octyldodecyl‐Diketopyrrolopyrrole and Benzothiadiazole Units

Near‐Infrared Organic Phototransistors with p‐Channel Photosensitive Layers of Conjugated Polymer Composed of bis‐Octyldodecyl‐Diketopyrrolopyrrole and Benzothiadiazole Units

The effect of air exposure on device performance of flexible C8-BTBT organic thin-film transistors with hygroscopic insulators

A self-powered gas sensor based on PDMS/Ppy triboelectric-gas-sensing arrays for the real-time monitoring of automotive exhaust gas at room temperature

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