Applied Science and Convergence Technology

The Korean Vacuum Society (한국진공학회)
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Probing the Molecular Orientation of ZnPc on AZO Using Soft X-ray Spectroscopies for Organic Photovoltaic Applications

  • Received : 2015.09.24
  • Accepted : 2015.09.30
  • Published : 2015.09.30
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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.

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References

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