Removal of Surface Oxygen Vacancies Increases Conductance Through TiO2 Thin Films for Perovskite Solar Cells | Zendy

Alexander Klasen | Zendy; Philipp Baumli | Zendy; Qu Sheng | Zendy; Ewald Johannes | Zendy; Simon Bretschneider | Zendy; Ilka Hermes | Zendy; V. Bergmann | Zendy; Christopher Gort | Zendy; Amelie Axt | Zendy; Stefan A. L. Weber | Zendy; Heejae Kim | Zendy; HansJürgen Butt | Zendy; Wolfgang Tremel | Zendy; Rüdiger Berger | Zendy

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Removal of Surface Oxygen Vacancies Increases Conductance Through TiO₂ Thin Films for Perovskite Solar Cells

Author(s) -

Alexander Klasen,

Philipp Baumli,

Qu Sheng,

Ewald Johannes,

Simon Bretschneider,

Ilka Hermes,

V. Bergmann,

Christopher Gort,

Amelie Axt,

Stefan A. L. Weber,

Heejae Kim,

HansJürgen Butt,

Wolfgang Tremel,

Rüdiger Berger

Publication year - 2019

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/acs.jpcc.9b02371

Subject(s) - anatase , materials science , perovskite (structure) , x ray photoelectron spectroscopy , thin film , tin oxide , mesoporous material , conductance , energy conversion efficiency , oxygen , ozone , oxide , chemical engineering , analytical chemistry (journal) , photocatalysis , nanotechnology , doping , optoelectronics , chemistry , catalysis , biochemistry , mathematics , organic chemistry , combinatorics , chromatography , engineering , metallurgy

We report that UV-ozone treatment of TiO 2 anatase thin films is an efficient method to increase the conductance through the film by more than 2 orders of magnitude. The increase in conductance is quantified via conductive scanning force microscopy on freshly annealed and UV-ozone-treated TiO 2 anatase thin films on fluorine-doped tin oxide substrates. The increased conductance of TiO 2 anatase thin films results in a 2% increase of the average power conversion efficiency (PCE) of methylammonium lead iodide-based perovskite solar cells. PCE values up to 19.5% for mesoporous solar cells are realized. The additional UV-ozone treatment results in a reduced number of oxygen vacancies at the surface, inferred from X-ray photoelectron spectroscopy. These oxygen vacancies at the surface act as charge carrier traps and hinder charge extraction from the adjacent material. Terahertz measurements indicate only minor changes of the bulk conductance, which underlines the importance of UV-ozone treatment to control surface-based defects.

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