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Their mixed ionic\u2010electronic conduction, once regarded as detrimental to device stability, is increasingly viewed as a functional degree of freedom for memory and neuromorphic\u2010inspired devices, especially when coupled to external stimuli such as light. Specifically, single crystals are attractive models because they suppress grain\u2010boundary effects and microstructural disorder that can mask intrinsic transport and interfacial mechanisms in polycrystalline films. Here, we report the growth of thin methylammonium lead iodide (MAPbI\n                    <jats:sub>3<\/jats:sub>\n                    ) single crystals by a space\u2010confined method and their integration into planar two\u2010terminal devices with directly deposited Ag contacts. At room temperature, the devices exhibit ultra\u2010low dark currents (10\n                    <jats:sup>\u221213<\/jats:sup>\n                    \u201010\n                    <jats:sup>\u221212<\/jats:sup>\n                    A) and negligible hysteresis in the dark. Under illumination, the current increases due to photogeneration and the I\u2010V characteristics develop a pronounced polarity\u2010dependent hysteresis and a threshold\u2010like transition between two conductance states. Temperature\u2010dependent dark measurements (300\u2013400 K) show thermionically activated, contact\u2010influenced transport and a weakly varying normalized hysteresis metric. Together with the back\u2010to\u2010back Schottky\u2010diode analysis and control devices using more inert contact materials, these results support a transport model in which Ag\/perovskite interfaces play a central role and the hysteretic response is influenced by coupled interfacial and ionic processes.\n                  <\/jats:p>","DOI":"10.1002\/advs.77024","type":"journal-article","created":{"date-parts":[[2026,8,7]],"date-time":"2026-08-07T11:57:40Z","timestamp":1786103860000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Optically Tunable Threshold Switching and Thermally Activated Transport in Planar Ag\/MAPbI\n                    <sub>3<\/sub>\n                    Thin Single\u2010Crystal Devices"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3539-3858","authenticated-orcid":false,"given":"Ofelia","family":"Durante","sequence":"first","affiliation":[{"name":"Department of Physics \u2018E. R. Caianiello\u2019 University of Salerno  Fisciano (SA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1613-4383","authenticated-orcid":false,"given":"Valeria","family":"Demontis","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-8492-0857","authenticated-orcid":false,"given":"Sebastiano","family":"De Stefano","sequence":"additional","affiliation":[{"name":"Department of Physics \u2018E. R. Caianiello\u2019 University of Salerno  Fisciano (SA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-7305-8165","authenticated-orcid":false,"given":"Selene","family":"Matta","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-9021-7874","authenticated-orcid":false,"given":"Adolfo","family":"Mazzotti","sequence":"additional","affiliation":[{"name":"Department of Physics \u2018E. R. Caianiello\u2019 University of Salerno  Fisciano (SA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniela","family":"Marongiu","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-4420-0119","authenticated-orcid":false,"given":"Emanuele","family":"Meloni","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elisa","family":"Pili","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fang","family":"Liu","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicola","family":"Sestu","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8789-4275","authenticated-orcid":false,"given":"Angelica","family":"Simbula","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3745-3834","authenticated-orcid":false,"given":"Mauro","family":"Carta","sequence":"additional","affiliation":[{"name":"Department of Mechanical, Chemical and Materials Engineering University of Cagliari  Cagliari Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michele","family":"Saba","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6935-4216","authenticated-orcid":false,"given":"Andrea","family":"Mura","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9416-189X","authenticated-orcid":false,"given":"Massimiliano","family":"Di Ventra","sequence":"additional","affiliation":[{"name":"Department of Physics University of California San Diego  La Jolla CA USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Giovanni","family":"Bongiovanni","sequence":"additional","affiliation":[{"name":"Department of Physics University of Cagliari  Monserrato (CA) Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3629-726X","authenticated-orcid":false,"given":"Antonio","family":"Di Bartolomeo","sequence":"additional","affiliation":[{"name":"Department of Physics \u2018E. 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