Mixed donor-acceptor molecular heterojunctions for photovoltaic applications. I. Material properties

Barry P. Rand, Jiangeng Xue, Soichi Uchida, Stephen R. Forrest

Research output: Contribution to journalReview article

315 Scopus citations

Abstract

In this and the following paper (Parts I and II, respectively), we discuss the properties of mixed donor-acceptor organic thin films and their application to organic solar cells. In Part I, we present a study of the material properties of mixed donor-acceptor thin films. Through optical absorption, x-ray diffraction, microscopy, and charge transport measurements, we determine the relationships among film microstructure, mixing ratio, and charge conduction in mixtures of two organic molecular species. We find that mixed layers of the molecular pair of 1:1 (by weight) copper phthalocyanine in C60 have electron and hole mobilities reduced by more than one order of magnitude compared to corresponding films of pure composition. In Part II, we demonstrate that the performance of organic hybrid planar-mixed heterojunction photovoltaic cells based on a mixed donor-acceptor molecular layer sandwiched between the donor and acceptor layers of homogeneous composition can have improved performance over conventional planar heterojunction cells containing no mixed composition layers.

Original languageEnglish (US)
Article number124902
JournalJournal of Applied Physics
Volume98
Issue number12
DOIs
StatePublished - Dec 1 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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