Kang, Minji Cha, An-Na Lee, Sang-A Lee, Seoung-Ki Bae, Sukang Jeon, Dae-Young Hong, Jae-Min Fabiano, Simone Berggren, Magnus Kim, Tae-Wook 2024-01-19T18:02:52Z 2024-01-19T18:02:52Z 2021-09-04 2020-03 1566-1199 https://pubs.kist.re.kr/handle/201004/118922 Organic phototransistor memory is considered as a promising optoelectronic device owing to its multifunctionality. However, due to the poor reliability of each function and the complexity of the device structure, it is necessary to optimize the thin-film process of functional materials when constructing multiple functions into a single device. Here, we demonstrate a dual-functional device that is both a working memory transistor and a phototransistor by incorporating photochromic spironaphthooxazine molecules into an organic insulating layer. The photochmmic molecules in the polymer matrix not only exhibit nonvolatile charge storage properties similar to nano-floating gates but also feature a reversible electronic band structure upon alternating irradiation with ultraviolet and visible light, which makes the device function as both an electrical memory transistor and a phototransistor. Furthermore, the photoresponsive charge trap layer in the demonstrated device leads to excellent memory performance under both dark and light conditions, which includes a large memory window (-56 V), stable endurance cycles (>10(2)), and good retention characteristics (>10(4) s). Our findings suggest an alternative strategy to realize organic multifunctional nonvolatile memories. English ELSEVIER Light-sensitive charge storage medium with spironaphthooxazine molecule-polymer blends for dual-functional organic phototransistor memory Article 10.1016/j.orgel.2019.105554 1 ORGANIC ELECTRONICS, v.78 ORGANIC ELECTRONICS 78 N scie scopus 000517963700036 2-s2.0-85075394380 Materials Science, Multidisciplinary Physics, Applied Materials Science Physics Article FIELD-EFFECT TRANSISTORS Organic field-effect transistor Nonvolatile memory Photosensor Photochromic Multifunctional