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Ultrathin TiO2 films on zno electron-collecting layers of inverted organic solar cell

Title
Ultrathin TiO2 films on zno electron-collecting layers of inverted organic solar cell
Authors
Seo H.O.Park S.-Y.Shim W.H.Kim K.-D.Lee K.H.Jo M.Y.Kim J.H.Lee E.Kim D.-W.Kim Y.D.Lim D.C.
Ewha Authors
김동욱
SCOPUS Author ID
김동욱scopus
Issue Date
2011
Journal Title
Journal of Physical Chemistry C
ISSN
1932-7447JCR Link
Citation
vol. 115, no. 43, pp. 21517 - 21520
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Nanostructured ZnO thin films were fabricated on indium tin oxide (ITO) as hole-blocking and electron-collecting layers of inverted organic solar cells. In addition, TiO2 thin films were deposited on ZnO surfaces using atomic layer deposition. Ultrathin TiO2 layers with a mean thickness of <3 nm could enhance photovoltaic performance of the inverted organic solar cell; in particular, short-circuit current (Jsc) and power conversion efficiency (PCE) were increased by deposition of TiO2 layers. A higher thickness of TiO2 resulted in reduced photovoltaic performance. Studies on electronic structure using photoelectron spectroscopy showed that the TiO2 layers should act as barrier for the electron-collection on ZnO. However, recombination of electrons and holes on the surface of ZnO can be quenched by TiO2, resulting in an improved efficiency of the IOSCs. It is demonstrated that atomic layer deposition with a precise control of film thickness can be of potential application for fabrication of energy devices. © 2011 American Chemical Society.
DOI
10.1021/jp2063589
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자연과학대학 > 물리학전공 > Journal papers
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