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They offer a compelling route to filter\u2010free, narrowband photodetection compared with broadband 3D counterparts. While halide mixing provides spectral tunability, it introduces severe phase segregation and energetic disorder. Current understanding of this phenomenon is derived mainly from static material characterisation, leaving its dynamic impact in operational devices unexplored. Herein, we bridge this gap by integrating\n                    <jats:italic>n<\/jats:italic>\n                    = 1 (PEA)\n                    <jats:sub>2<\/jats:sub>\n                    PbBr\n                    <jats:sub>x<\/jats:sub>\n                    I\n                    <jats:sub>4\u2010x<\/jats:sub>\n                    into photoconductors, achieving tunable response from 400 to 520\u00a0nm, and a maximum specific detectivity (\n                    <jats:italic>D<\/jats:italic>\n                    <jats:sup>*<\/jats:sup>\n                    ) of 2.11\u00a0\u00d7\u00a010\n                    <jats:sup>11<\/jats:sup>\n                    Jones at an applied bias of 20\u00a0V. We reveal the existence of two different phases and the gradual transition based on halide compositions, studied how mixing halide drives phase segregation with density functional theory calculations. Although the chloride additive PEACl suppressed phase segregation in mixed halides, it introduced additional traps that reduced photocurrent. The additive enhanced the out\u2010of\u2010plane orientation, disrupting in\u2010plane transport in photoconductors, but significantly improved performance in photodiodes. This work provides the first device\u2010level insight into halide immiscibility in\n                    <jats:italic>n<\/jats:italic>\n                    = 1 2D\u2010perovskites, revealing that overcoming the performance limitations in these systems requires balancing long\u2010range structural order with short\u2010range electronic disorder.\n                  <\/jats:p>","DOI":"10.1002\/smll.73312","type":"journal-article","created":{"date-parts":[[2026,4,3]],"date-time":"2026-04-03T11:40:11Z","timestamp":1775216411000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Revealing the Impact of Phase Transition on\n                    <i>n<\/i>\n                    = 1 2D Perovskite Photodetectors With Intrinsically Tunable Narrowband Detection"],"prefix":"10.1002","volume":"22","author":[{"given":"Ding","family":"Ding","sequence":"first","affiliation":[{"name":"Department of Chemistry and Centre for Processable 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