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Title: Optical interference for the matching of the external and internal quantum efficiencies in organic photovoltaic cells
Authors: Betancur, Rafael; Martínez-Otero, Alberto ; Elias, Xavier; Romero-Gómez, Pablo ; Míguez, Hernán ; Colodrero, Silvia ; Martorell, Jordi
Keywords: Optical interference
Organic solar cells
Issue Date: Sep-2012
Publisher: Elsevier
Citation: Solar Energy Materials and Solar Cells 104: 87–91 (2012)
Abstract: We demonstrate experimentally that an appropriate combination of the layer thicknesses in an inverted P3HT:PCBM cell leads to an optical interference such that the EQE amounts to 91% of IQE. We observe that reflectivity between layers is minimized in a wavelength range of more than 100 nm. In that range the EQE closely matches the IQE. The role played by the optical interference in improving the performance of the fabricated solar cells is confirmed by EQE calculated numerically using a model based on the transfer matrix method. Additionally, we observed that a similar cell with an active material 1.7 times thicker exhibited a lower PCE. The poor photon harvesting in the later cell configuration is attributed to an EQE that amounts only to 72% of the IQE.
Description: 5 páginas, 5 figuras, 1 tabla
Publisher version (URL): http://dx.doi.org/10.1016/j.solmat.2012.04.047
URI: http://hdl.handle.net/10261/82792
DOI: 10.1016/j.solmat.2012.04.047
ISSN: 0927-0248
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