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Charge Generation at Polymer/Metal Oxide Interface: from Molecular Scale Dynamics to Mesoscopic Effects
Author(s) -
Kandada Ajay Ram Srimath,
Guarnera Simone,
Tassone Francesco,
Lanzani Guglielmo,
Petrozza Annamaria
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201303689
Subject(s) - materials science , mesoscopic physics , polymer , chemical physics , oxide , ultrafast laser spectroscopy , molecular dynamics , nanotechnology , nanoscopic scale , spectroscopy , nanoparticle , metal , electron , chemical engineering , condensed matter physics , composite material , computational chemistry , chemistry , physics , quantum mechanics , engineering , metallurgy
The correlation between molecular scale morphology and charge generation across hybrid photovoltaic interfaces made of metal oxides (ZnO and TiO 2 ) and a prototypical electron donor polymer, P3HT, is investigated. Device characterization and UV‐NIR transient absorption spectroscopy are used to demonstrate that the local disorder of the polymer chains on the surface of the metal–oxide film provides better electron injection efficiencies than the crystalline phases, though the latter are essential for energy and charge transport. An unambiguous spectroscopic tool is also demonstrated to probe the occupation of the conduction band of ZnO following the electron injection from the polymer through the ultrafast tracking of the Burstein‐Moss effect.