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Title: Graphene Modified Indium Tin Oxide Electrodes for Organic Solar Cells
Keywords: organic solar cells, graphene, F4-TCNQ, CuPc, TOF-SIMS, synchrotron
Issue Date: 6-Aug-2014
Citation: CHANG CI'EN SHARON (2014-08-06). Graphene Modified Indium Tin Oxide Electrodes for Organic Solar Cells. ScholarBank@NUS Repository.
Abstract: The physical properties in copper phthalocyanine (CuPc) are anisotropic and greatly depend on the crystalline orientation. Graphene grown by chemical vapour deposition and integrated onto ITO electrodes (G/ITO) can modify the orientation of CuPc molecules through templating, causing a larger projection of the molecular plane onto the substrate plane. However, energy level mismatch of ~1eV between graphene and the CuPc layer hinders charge extraction at the interface. We show that a thin layer of 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) deposited on G/ITO dramatically reduces the hole injection barrier at the interface without affecting the structural templating of CuPc by graphene. Finally, time-of-flight secondary ion mass spectrometry (TOF-SIMS) reveals that the diffusion of F4-TCNQ is ~0.3mol% which should not have a detrimental effect on the proposed solar cell device performance. This CuPc/F4-TCNQ/G/ITO anode design has potential applications in other organic solar cells that use polyaromatic molecules with similar electronic properties in their active layer.
Appears in Collections:Ph.D Theses (Open)

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