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Here, two types of organic synaptic transistors (OSTRs), OSTR\u2010A and OSTR\u2010B, are fabricated on either glass or polymer film using water\u2010processable charge\u2010trapping gate\u2010insulating layers that are prepared by reacting ethylenediamine (EDA) and poly(2\u2010acrylamido\u20102\u2010methyl\u20101\u2010propanesulfonic acid) (PAMPSA). OSTR\u2010A is designed to function as a basic artificial synapse by gate pulse stimulation only, while OSTR\u2010B has additional near\u2010infrared (NIR)\u2010absorbing conjugated polymer layers for further sensing of NIR light upon gate voltage stimulations. The PAMPSA:EDA films are found to contain permanent charge bridges (ion pairs of \u2013SO<jats:sub>3<\/jats:sub><jats:sup>\u2212 +<\/jats:sup>NH<jats:sub>3<\/jats:sub>\u2010) that play a charge\u2010trapping role in OSTRs. Both devices with the PAMPSA:EDA layers exhibit clear postsynaptic current (PSC) signals upon gate voltage pulses, leading to long\u2010term potentiation\/depression characteristics. The flexible OSTR\u2010B devices can sense the NIR light (905\u2009nm) upon gate pulse stimulation and their PSC signals are well maintained even after bending (&gt;5000 times). Artificial neural network simulations disclose that the flexible OSTR\u2010B devices can stably perform synaptic operations under the NIR light with high accuracy (&gt;90%) even after repeated bending (5000 times), indicative of potential use in artificial neuromorphic skin applications.<\/jats:p>","DOI":"10.1002\/aisy.202300651","type":"journal-article","created":{"date-parts":[[2024,1,4]],"date-time":"2024-01-04T13:19:12Z","timestamp":1704374352000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Near\u2010Infrared\u2010Sensing Flexible Organic Synaptic Transistors with Water\u2010Processable Charge\u2010Trapping Polymers for Potential Neuromorphic Computing\/Skin Applications"],"prefix":"10.1002","volume":"6","author":[{"given":"Taehoon","family":"Kim","sequence":"first","affiliation":[{"name":"Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications (KINPA) Department of Chemical Engineering Kyungpook National University  Daegu 41566 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Woongki","family":"Lee","sequence":"additional","affiliation":[{"name":"Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications (KINPA) Department of Chemical Engineering Kyungpook National University  Daegu 41566 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Soyeon","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Energy &amp; Electronic Materials Surface Materials Division Korea Institute of Materials Science (KIMS)  Changwon 51508 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong Chan","family":"Lim","sequence":"additional","affiliation":[{"name":"Department of Energy &amp; Electronic Materials Surface Materials Division Korea Institute of Materials Science (KIMS)  Changwon 51508 Republic of Korea"},{"name":"Nano Technology Innovation Center Korea Institute of Materials Science (KIMS)  Changwon 51508 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9391-2636","authenticated-orcid":false,"given":"Youngkyoo","family":"Kim","sequence":"additional","affiliation":[{"name":"Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications (KINPA) Department of Chemical Engineering Kyungpook National University  Daegu 41566 Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,1,4]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1177\/1729881419839596"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-019-1424-8"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41565-019-0501-3"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1109\/MSPEC.2017.7934231"},{"key":"e_1_2_8_6_1","first-page":"18872586","volume":"2020","author":"Xu Z.","year":"2020","journal-title":"Secur. 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