Spectroscopic properties of electrochemically populated electronic states in nanostructured TiO2 films: anatase versus rutile

被引:17
作者
Berger, Thomas [1 ]
Anta, Juan A. [1 ]
Morales-Florez, Victor [2 ,3 ]
机构
[1] Univ Pablo Olavide, Area Quim Fis, Dept Sistemas Fis Quim & Nat, E-41013 Seville, Spain
[2] Univ Seville, CSIC, Inst Ciencia Mat Sevilla, E-41092 Seville, Spain
[3] Univ Seville, Dept Fis Mat Condensada, E-41012 Seville, Spain
关键词
SENSITIZED SOLAR-CELLS; AQUEOUS-SOLUTIONS; CONDUCTION-BAND; THIN-FILMS; SEMICONDUCTOR-FILMS; TRAPPED ELECTRONS; DIRECT DEPOSITION; IR ABSORPTIONS; SURFACE; WATER;
D O I
10.1039/c3cp52324a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A thorough characterization of nanostructured materials under application-relevant conditions is a prerequisite for elucidating the interplay between their physicochemical nature and their functional properties in practical applications. Here, we use a spectroelectrochemical approach to study the population of electronic states in different types of nanostructured anatase and rutile TiO2 films in contact with an aqueous electrolyte. The spectroscopic properties of the two polymorphs were addressed under Fermi level control in the energy range between the fundamental absorption threshold and the onset of lattice absorption (3.3-0.1 eV). The results evidence the establishment of an equilibrium between localized Ti3+ centers absorbing in the vis/NIR and shallow (e(-))(H+) traps absorbing in the MIR upon electron accumulation in anatase electrodes. The absence of the MIR-active (e(-))(H+) traps on all rutile electrodes points to a crystal structure-dependent electron population in the films.
引用
收藏
页码:13790 / 13795
页数:6
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