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

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

Research output: Contribution to journalArticlepeer-review

Abstract

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
Volume8
Issue number9
DOIs
Publication statusPublished - 2016

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2013R1A1A4A01011392). The NSLS is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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