Neutron reflectometry and hard X-ray photoelectron spectroscopy study of the vertical segregation of PCBM in organic solar cells

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Neutron reflectometry and hard X-ray photoelectron spectroscopy study of the vertical segregation of PCBM in organic solar cells

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Publication Article, peer reviewed scientific
Title Neutron reflectometry and hard X-ray photoelectron spectroscopy study of the vertical segregation of PCBM in organic solar cells
Author Urbina, Antonio ; Abad, Jose ; Fernandez Romero, Antonio J. ; Lacasa, Jesus S. ; Colchero, Jaime ; Gonzalez-Martinez, Juan Francisco ; Rubio-Zuazo, Juan ; Castro, German R. ; Gutfreund, Philipp
Date 2019
English abstract
The composition of the active layer of a benchmark functional glass/ITO/[P3HT:PCBM][1.1:1]/Al organic solar cell has been studied by neutron reflectometry (NR) and hard X-ray photoelectron spectroscopy (HAXPES). Thermal annealing was performed in several steps and NR and HAXPES were recorded for every temperature. By fitting the NR results to a model composed of several layers, the scattering length density (SLD) distribution through the sample was obtained, and from this SLD profile, the evolution of the composition of the active layer as a function of temperature was established. For the outer layers, HAXPES results confirm the composition evolution. The results show that PCBM tends to segregate reducing the initial concentration of PCBM in the central part of the active layer and increasing its concentration towards both interfaces. The effect of the Al electrode as studied by HAXPES on the nearest zone of the active layer (up to 50 nm) is to stabilize the P3HT depletion in this area, an effect which is not affected by thermal annealing.
DOI https://doi.org/10.1016/j.solmat.2018.10.004 (link to publisher's fulltext.)
Publisher Elsevier
Host/Issue Solar Energy Materials and Solar Cells;
Volume 191
ISSN 0927-0248
Language eng (iso)
Subject Organic solar cells
Neutron reflectometry
Hard X-ray photoelectron spectroscopy
Conjugated polymers
P3HT:PCBM
Technology
Research Subject Categories::TECHNOLOGY
Handle http://hdl.handle.net/2043/29445 Permalink to this page
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