Templating Effects in Molecular Growth of Blended Films for Efficient Small-Molecule Photovoltaics

A strategy to control the molecular growth of coevaporated zinc phthalocyanine (ZnPc) and fullerene (C60) blended films for efficient organic photovoltaic (OPV) cells was demonstrated. Introduction of a 2,5-bis­(4-biphenylyl)-bithiophene (BP2T) film or a ZnPc film on BP2T as nanostructured templates...

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Published inACS applied materials & interfaces Vol. 6; no. 9; pp. 6369 - 6377
Main Authors Wang, Zhiping, Miyadera, Tetsuhiko, Yamanari, Toshihiro, Yoshida, Yuji
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 14.05.2014
Subjects
templating effects
molecular growth
organic blended film
organic photovoltaics
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Summary:A strategy to control the molecular growth of coevaporated zinc phthalocyanine (ZnPc) and fullerene (C60) blended films for efficient organic photovoltaic (OPV) cells was demonstrated. Introduction of a 2,5-bis­(4-biphenylyl)-bithiophene (BP2T) film or a ZnPc film on BP2T as nanostructured templates not only results in phase-separated domains in blended films with clear interpenetrating networks but also improves the crystallinity of ZnPc domains, both of which enhance photocurrent generation and charge carrier transport. Such morphology is strongly associated with the molecular growth of the templating layers. Roughness and adhesion of the templating layers are of great importance for the molecular growth of the blended films and in turn for cell characteristics. By carefully regulating the molecular growth of the blended films, the power conversion efficiency was improved by 125%, from 1.85 to 4.15% under 1 sun.
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ISSN:1944-8244
1944-8252
DOI:10.1021/am405740c