Sub-ppm and high response organic thin-film transistor NO2 sensor based on nanofibrillar structured TIPS-pentacene

Breath figure–derived porous semiconducting films for organic electronics

“…Thus, semiconductor films having grain boundaries/porosities nearest the channel exhibit larger sensitivities to analytes than those having smooth/amorphous film morphologies (7). Nevertheless, achieving these porous morphologies is particularly challenging when using semiconducting polymers, which typically form far more uniform channel layers than small molecules.…”

A highly selective electron affinity facilitated H2S sensor: the marriage of tris(keto-hydrazone) and an organic field-effect transistor

“…In the case of a bilayer configuration, the preferred elements will have (i) appreciable chemical compatibility among layers, (ii) good porous structures to improve gas absorption and (iii) good stability under various ambient conditions. Some of the strategies employed to realize better-sensing performance using DPP-based OFET sensors include optimization of film thickness, 16,17,20,38 tuning the porous structures to improve the surface reactivity, 18,20,39,40 blending the polymers with materials (such as graphene oxide, 39 MoS 2 , 39 polystyrenes, 39 PBA 39 and MOF 22 ) and attaching functional groups (sulfur-based motif, 41 siloxane, 39 butoxycarboxyl, 39 tetraethyl glycol, 16 thymine 42 and naphthalene 20 ) to the side chain of polymers. However, major disadvantages include their poor stability under humidity and bias stress and the resultant failure to exhibit reproducible and reliable gas-sensing performance.…”

Organic Thin-Film Transistors as Gas Sensors: A Review

“…Since 2015, most gas sensors were demonstrated in a bottom gate structure over thermally-oxidized Si wafers and by employing well-known clean-room fabrication techniques [70,72,73,[80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97]. Physical vapor deposition of metals (e.g., thermal evaporation, electron-beam PVD and sputtering) [70,72,73,80,[82][83][84][85][86][87][88][89]91,[94][95][96][97][98][99][100][101][102][103][104][105][106][107] and photolithography [70,…”

“…Recently-synthesized small organic molecules, however, were made soluble by the addition of side chain and functional groups. A few examples are 2,7-dioctyl benzothieno[3,2-b]benzothiophene (C 8 -BTBT) [85], triethylsilylethynyl-anthradithiophene (TES-ADT) [97] and 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) [95,96,101,102]. In addition, small organic molecules can be modified to form self-assembled monolayers.…”