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http://dx.doi.org/10.5757/ASCT.2015.24.5.151

Probing the Molecular Orientation of ZnPc on AZO Using Soft X-ray Spectroscopies for Organic Photovoltaic Applications  

Jung, Yunwoo (Department of Physics, Yonsei University)
Lee, Nalae (Department of Physics, Yonsei University)
Kim, Jonghoon (Department of Physics, Yonsei University)
Im, Yeong Ji (Department of Physics, Yonsei University)
Cho, Sang Wan (Department of Physics, Yonsei University)
Publication Information
Applied Science and Convergence Technology / v.24, no.5, 2015 , pp. 151-155 More about this Journal
Abstract
The interfacial electronic structure between zinc phthalocyanine (ZnPc) and aluminumdoped zinc oxide (AZO) substrates has been evaluated by ultraviolet photoemission spectroscopy and angle-dependent x-ray absorption spectroscopy to understanding the molecular orientation of a ZnPc layer on the performance of small molecule organic photovoltaics (OPVs). We find that the ZnPc tilt angle improves the ${\pi}-{\pi}$ interaction on the AZO substrate, thus leading to an improved short-circuit current in OPVs based on phthalocyanine. Furthermore, the molecular orientation-dependent energy level alignment has been analyzed in detail using ultraviolet photoemission spectroscopy. We also obtained complete energy level diagrams of ZnPc/AZO and ZnPc/indium thin oxide.
Keywords
Organic semiconductors; Molecular orientation; ZnPc; AZO;
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