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Here, B\u2010PAH\n                    <jats:bold>1<\/jats:bold>\n                    , a planar, sterically unhindered ring\u2010fusion B\u2010PAH with two covalently embedded boron atoms whose empty\n                    <jats:italic>p<\/jats:italic>\n                    <jats:sub>z<\/jats:sub>\n                    orbitals stabilize unoccupied states, and its all\u2010carbon analogue PAH\n                    <jats:bold>2<\/jats:bold>\n                    provide a matched platform to connect molecular design, assembly, and frontier\u2010level alignment on highly oriented pyrolytic graphite. B\u2010PAH\n                    <jats:bold>1<\/jats:bold>\n                    forms ordered monolayers, electric\u2010pulse\u2010induced bilayers, and vapor\u2010deposited terraced films. Spectroscopy shows that boron incorporation stabilizes the unoccupied band edge, whose energetic position varies across monolayer, bilayer, and thin\u2010film environments, with the thin\u2010film LUMO\u2010derived onset of B\u2010PAH\n                    <jats:bold>1<\/jats:bold>\n                    reaching \u22124.04\u00a0eV versus vacuum, 1.27\u00a0eV lower than that of PAH\n                    <jats:bold>2<\/jats:bold>\n                    . Unexpectedly, despite its deeper unoccupied states, B\u2010PAH\n                    <jats:bold>1<\/jats:bold>\n                    exhibits a 0.20\u00a0eV smaller effective work function than PAH\n                    <jats:bold>2<\/jats:bold>\n                    , revealing distinct film\u2010surface energetics whose microscopic origin remains unresolved. These results establish planar B\u2010PAHs as experimentally accessible low\u2010LUMO molecular films with tunable surface energetics.\n                  <\/jats:p>","DOI":"10.1002\/smll.76420","type":"journal-article","created":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T14:32:50Z","timestamp":1792765970000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Film\u2010State Low\u2010lying LUMO\u2010Derived Electronic Structure of Fusion\u2010Atom Boron\u2010Doped Polycyclic Aromatic Hydrocarbons"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-8373-6073","authenticated-orcid":false,"given":"Po\u2010Wei","family":"Tung","sequence":"first","affiliation":[{"name":"Department of Chemistry National Taiwan University  Taipei Taiwan"},{"name":"Center For Emerging Materials and Advanced Devices National Taiwan University  Taipei 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