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

Hyun Ook Seo, Sun Young Park, Won Hyun Shim, Kwang Dae Kim, Kyu Hwan Lee, Mi Young Jo, Joo Hyun Kim, Eunsongyi Lee, Dong Wook Kim, Young Dok Kim, Dong Chan Lim

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

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.

Original languageEnglish
Pages (from-to)21517-21520
Number of pages4
JournalJournal of Physical Chemistry C
Volume115
Issue number43
DOIs
StatePublished - 3 Nov 2011

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