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Understanding how phase composition regulates ultrafast carrier dynamics is essential for optimizing device performance. In this work, monocrystalline thin films of (PEA)2(MA)n\u22121PbnI3n+1 with well-controlled phase distributions were prepared using a space-confined anti-solvent crystallization method. Micro-area femtosecond pump\u2013probe spectroscopy was employed to investigate the influence of phase composition on the relaxation behavior of photoexcited carriers. The results reveal that increasing the proportion of small-n phases leads to a pronounced extension of the excited-state relaxation process in large-n domains, attributed to suppressed defect-assisted trapping and enhanced interphase carrier transfer efficiency. This study provides a microscopic physical picture of the energy funneling mechanism governed by phase composition in quasi-2D perovskites and establishes an experimental framework for regulating carrier dynamics.<\/jats:p>","DOI":"10.1063\/5.0302611","type":"journal-article","created":{"date-parts":[[2026,1,7]],"date-time":"2026-01-07T11:54:14Z","timestamp":1767786854000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Phase-regulated energy funneling and carrier relaxation dynamics in quasi-2D perovskites revealed by micro-area transient absorption spectroscopy"],"prefix":"10.1063","volume":"164","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-8366-425X","authenticated-orcid":false,"given":"Qian","family":"Cui","sequence":"first","affiliation":[{"name":"Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Photonic Technique for Information, School of Electronics Science and Engineering, Faculty of Electronic and Information Engineering, Xi\u2019an Jiaotong University , Xi\u2019an 710049,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9860-597X","authenticated-orcid":false,"given":"Lihe","family":"Yan","sequence":"additional","affiliation":[{"name":"Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Photonic Technique for Information, School of Electronics Science and Engineering, Faculty of Electronic and Information Engineering, Xi\u2019an Jiaotong University , Xi\u2019an 710049,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ya\u2019nan","family":"Shen","sequence":"additional","affiliation":[{"name":"Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Photonic Technique for Information, School of Electronics Science and Engineering, Faculty of Electronic and Information Engineering, Xi\u2019an Jiaotong University , Xi\u2019an 710049,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4680-2717","authenticated-orcid":false,"given":"Jinhai","family":"Si","sequence":"additional","affiliation":[{"name":"Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Photonic Technique for Information, School of Electronics Science and Engineering, Faculty of Electronic and Information Engineering, Xi\u2019an Jiaotong University , Xi\u2019an 710049,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xun","family":"Hou","sequence":"additional","affiliation":[{"name":"Key Laboratory for Physical Electronics and Devices of the Ministry of Education and Shaanxi Key Lab of Photonic Technique for Information, School of Electronics Science and Engineering, Faculty of Electronic and Information Engineering, Xi\u2019an Jiaotong University , Xi\u2019an 710049,","place":["China"]}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2026,1,7]]},"reference":[{"key":"2026010706540829700_c1","doi-asserted-by":"publisher","first-page":"479","DOI":"10.1038\/s41566-025-01618-z","volume":"19","year":"2025","journal-title":"Nat. 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