Synthesis Control of Charge Separation at Anatase TiO2 Thin Films Studied by Transient Surface Photovoltage Spectroscopy

• DOI: 10.1021/acsami.2c09032
• Publication Date: 2022-09-13T23:40:05Z
• Authors: Thomas Dittrich; Jekaterina Sydorenko; Nicolae Spalatu; Norbert H. Nickel; Arvo Mere; Malle Krunks; Ilona Oja Acik
• Keywords: Surface Photovoltage; Transient (computer programming)

For the efficient photocatalytic oxidation of organic pollutants at surfaces semiconductors, photogenerated holes shall be separated toward surface and transferred to reactive sites, whereas transfer electrons minimized. In this Research Article, identification suitable synthesis control charge separation combined with an in-depth understanding kinetics trapping passivation mechanisms related can provide tremendous opportunities for boosting performance. work, a comprehensive transient photovoltage spectroscopy study anatase TiO2 thin films, synthesized by ultrasonic spray pyrolysis from titanium(IV) isopropoxide (TTIP)-acetylacetone (AcacH) based precursor is reported. By varying amount AcacH in solution, experimental approach provided first time. An increased promotes transition preferential fast electron hole surface, correlating strong increase decomposition rate pollutants. Suitable AcacH-induced traps are analyzed, providing new degree freedom tailoring properties systems.