Interfacial electronic structure of C60/chloro-aluminum phthalocyanine on a PTCDA layer for organic photovoltaic devices

Hyunbok Lee, Yunwoo Jung, Nalae Lee, Jonghoon Kim, Sangwan Cho, Dave Newby, Kevin E. Smith

Research output: Contribution to journalArticle


The interfacial electronic structure of C60/chloro-aluminum phthalocyanine (ClAlPc)/3,4,9,10-perylenetetracarboxylic- dianhydride (PTCDA) thin films grown on indium tin oxide (ITO) substrates was studied using in situ synchrotron radiation-excited photoelectron spectroscopy and angle-dependent X-ray absorption spectroscopy to understand the influence of the PTCDA interlayer on the performance of small molecule organic photovoltaics (OPVs). The subsequent ClAlPc tilt angle improves the π-π interactions at the interface due to a well-ordered underlying PTCDA interlayer, thus leading to an improved short-circuit current in OPVs based on ClAlPc/C60. Furthermore, the orientation-dependent energy level alignment of the same bilayer heterojunction was analyzed in detail using synchrotron radiation-excited photoelectron spectroscopy. The complete energy level diagrams of C60/ClAlPc with and without the PTCDA interlayer were obtained.

Original languageEnglish
Pages (from-to)1795-1798
Number of pages4
JournalScience of Advanced Materials
Issue number9
Publication statusPublished - 2016 Jan 1


All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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