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Strategic organic cation engineering bridges this transport\u2010noise trade\u2010off through controlled inter\u2010octahedral spacing. 2\u2010Fluorobenzylamine bismuth iodide (\n                    <jats:bold>2FBABI<\/jats:bold>\n                    ) features face\u2010sharing [Bi\n                    <jats:sub>2<\/jats:sub>\n                    I\n                    <jats:sub>9<\/jats:sub>\n                    ]\n                    <jats:sup>3\u2212<\/jats:sup>\n                    dimers with I\u00b7\u00b7\u00b7I contacts of 4.17 \u00c5 (97% of van der Waals sum), placing the material in an intermediate structural regime between fully isolated and strongly coupled octahedral units. Planar FTO\/\n                    <jats:bold>2FBABI<\/jats:bold>\n                    \/FTO photodetectors operate at ultra\u2010low voltages (0.001\u20130.09 V, lowest among biased bismuth\u2010based devices) with 0.08 pA dark current. Under 365 nm illumination at 0.09 V, devices achieve 11.5 A\/W responsivity, 3880% external quantum efficiency from photoconductive gain, 1.03 \u00d7 10\n                    <jats:sup>13<\/jats:sup>\n                    Jones detectivity, 125 dB linear dynamic range, and 85\/150 ms response times. Controlled inter\u2010octahedral distance engineering represents a viable strategy for optimizing lead\u2010free UV photodetectors.\n                  <\/jats:p>","DOI":"10.1002\/smll.74800","type":"journal-article","created":{"date-parts":[[2026,7,26]],"date-time":"2026-07-26T03:52:57Z","timestamp":1785037977000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Engineering Inter\u2010Octahedral Spacing in Bismuth Halide Perovskites: Ultra\u2010Low Voltage UV Photodetection with 2\u2010Fluorobenzylamine Bismuth Iodide"],"prefix":"10.1002","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-4599-7345","authenticated-orcid":false,"given":"Akash","family":"Suresh","sequence":"first","affiliation":[{"name":"Chemical Sciences and Technology Division CSIR\u2010National Institute for Interdisciplinary Science and Technology (NIIST) Thiruvananthapuram India"},{"name":"Academy of Scientific and Innovative 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