The Effect of Hole Transport Material Pore Filling on Photovoltaic Performance in Solid-State Dye-Sensitized Solar Cells
Hardin, Brian E.
Burkhard, George F.
McGehee, Michael D.
KAUST Grant NumberKUS-C1 - 015-21
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AbstractA detailed investigation of the effect of hole transport material (HTM) pore filling on the photovoltaic performance of solid-state dye-sensitized solar cells (ss-DSCs) and the specific mechanisms involved is reported. It is demonstrated that the efficiency and photovoltaic characteristics of ss-DSCs improve with the pore filling fraction (PFF) of the HTM, 2,2',7,7'-tetrakis-(N, N-di-p-methoxyphenylamine)9,9'-spirobifluorene(spiro-OMeTAD). The mechanisms through which the improvement of photovoltaic characteristics takes place were studied with transient absorption spectroscopy and transient photovoltage/photocurrent measurements. It is shown that as the spiro-OMeTAD PFF is increased from 26% to 65%, there is a higher hole injection efficiency from dye cations to spiro-OMeTAD because more dye molecules are covered with spiro-OMeTAD, an order-of-magnitude slower recombination rate because holes can diffuse further away from the dye/HTM interface, and a 50% higher ambipolar diffusion coefficient due to an improved percolation network. Device simulations predict that if 100% PFF could be achieved for thicker devices, the efficiency of ss-DSCs using a conventional rutheniumdye would increase by 25% beyond its current value. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
CitationMelas-Kyriazi J, Ding I-K, Marchioro A, Punzi A, Hardin BE, et al. (2011) The Effect of Hole Transport Material Pore Filling on Photovoltaic Performance in Solid-State Dye-Sensitized Solar Cells. Adv Energy Mater 1: 407–414. Available: http://dx.doi.org/10.1002/aenm.201100046.
SponsorsJ. M.-K. and I.-K. D. contributed equally to this work. This publication was partially based on work supported by the Center for Advanced Molecular Photovoltaics (Award No KUS-C1 - 015-21) made by King Abdullah University of Science and Technology (KAUST). A. M., A. P., N. T., M. G., and J.-E. M. are grateful to the Swiss National Science Foundation for financial support. We thank Dr. Robin Humphry-Baker for his experimental assistance with transient photovoltage/photocurrent measurements, Dr. Shaik M. Zakeeruddin for providing Z907 dye, Manuel Tschumi for fabricating TiO<INF>2</INF> films, and George Y. Margulis for providing absorption data used in Section 2.6.
JournalAdvanced Energy Materials