Title: Diffusion length of singlet excitons in copper phthalocyanine films
Abstract: work presents a method of extraction of exciton diffusion length from photocurrent spectrum measurements. A copper phthalocyanine (CuPc) layer was taken into consideration as an example. Samples were made in a high vacuum system by subsequent evaporation of the following layers: N, N’-dimethyle-3,4,9,10-perylenbis(dicarboximide) (MePTCDI) and CuPc and Au onto glass/ITO substrate. subject of our investigation was a saturation photocurrent generated by exciton dissociation at MePTCDI/CuPc interference. As a result of our analysis, the product of quantum efficiency of exciton dissociation and charge carrier collection and exciton diffusion length was estimated and it yielded 1.6nm. Full Text: PDF References M. Pope, Ch. Swenberg, Electronic Processes in Crystals and Polymers (New York, Oxford University Press 1999). P. Peumans, A. Yakimov, S.R. Forrest, Small molecular weight organic thin-film photodetectors and solar cells, J. Appl. Phys. 93, 3693 (2003) [CrossRef] M. Riede, T. Mueller, W. Tress, R. Schueppel, K. Leo, Small-molecule solar cells—status and perspectives, Nanotechnology 19, 1 (2008) [CrossRef] A.W. Hains, Z. Liang, M.A. Woodhouse, G.A. Gregg, Semiconductors in Photovoltaic Chem. Rev. 2010, 110 (11), pp 6689–6735 [CrossRef] Y. Zheng, J. Xue, Organic Photovoltaic Cells Based on Molecular Donor-Acceptor Heterojunctions, Polymer Reviews 50, 420 (2010) [CrossRef] V.M. Kenkre, P.E. Parris, D. Schmid, Investigation of the appropriateness of sensitized luminescence to determine exciton motion parameters in pure molecular crystals, Phys. Rev. B32, 4946 (1985) [CrossRef] S.R. Scully, M.D. McGehee, Effects of optical interference and energy transfer on exciton diffusion length measurements in organic semiconductors, J. Appl. Phys. 100, 034907 (2006) [CrossRef] R.R. Lunt, N.C. Giebink, A.A. Belak, J.B. Benziger, S.R. Forrest, Exciton diffusion lengths of organic semiconductor thin films measured by spectrally resolved photoluminescence quenching, J.Appl. Phys. 105, 053711 (2009) [CrossRef] Y. Vertsimakha, P. Lustyk, K. Palewska, J. Sworakowski, O. Lytvyn, and photovoltaic properties of thin films of N,N'-dimethyl-3,4,9,10-perylenetetracarboxylic acid diimide, Thin Solid Films 515, 7950 (2007) [CrossRef] G. Jarosz, R. Signerski, J. Godlewski, Acta Physica Polonica A 87, 855 (1995). A.K. Ghosh, T. Feng, Merocyanine organic solar cells, J. Appl. Phys. 49, 5982 (1978) [CrossRef] S.-B. Rim, P. Peumans, The effects of optical interference on exciton diffusion length measurements using photocurrent spectroscopy, J. Appl. Phys. 103, 124515 (2008) [CrossRef] T. Osasa, Y. Matsui, T. Matsumura, M. Matsumura, Determination of photo-active region in organic thin film solar cells with an organic heterojunction, Solar Energy Materials and Solar Cells, 90, 3136 (2006) [CrossRef] L.A.A. Pettersson, L.S. Roman, O. Ingan?s, Modeling photocurrent action spectra of photovoltaic devices based on organic thin films, J. Appl. Phys. 86, 487 (1999) [CrossRef] T. Stubinger, W. Brutting, Exciton diffusion and optical interference in organic donor–acceptor photovoltaic cells, J. Appl. Phys. 90, 3632 (2001) [CrossRef] Ch. Breyer, M. Vogel, M. Mohr, B. Johnev, K. Fostiropoulos, Influence of exciton distribution on external quantum efficiency in bilayer organic solar cells, Phys. Stat. Sol. (B) 243, 3176 (2006) [CrossRef] L.-G. Yang, H.Z. Chen, M. Wang, Optimal film thickness for exciton diffusion length measurement by photocurrent response in organic heterostructures, Thin Solid Films 516, 7701 (2008) [CrossRef] Y. Terao, H. Sasabe, C. Adachi, Correlation of hole mobility, exciton diffusion length, and solar cell characteristics in phthalocyanine/fullerene organic solar cells, Appl. Phys. Lett. 90, 103515 (2007) [CrossRef] R. Signerski, G. Jarosz, Effect of buffer layers on performance of organic photovoltaic devices based on copper phthalocyanine-perylene dye heterojunction, Opto-Electronics Review 19, 468 (2011) [CrossRef] N. Minami, M. Asai, Photocurrent Spectra of Phthalocyanine Films in Relation to Excited State Properties, Jap. J. Appl. Phys. 26, 1754 (1987) [CrossRef] L.M. Blinov, S.P. Palto, A.A. Vdalyev, Mol. Mat. 1, 65 (1992). M. Knupfer, T. Schwieger, H. Peisert, J. Fink, Mixing of Frenkel and charge transfer excitons in quasi-one-dimensional copper phthalocyanine molecular crystals, Phys. Rev. B 69, 165210 (2004) [CrossRef] M. Wojdyla, B. Derkowska, W. Bala, A. Bratkowski, A. Korcala, Optical Materials 28, 1000 (2006). S.-B. Rim, R.F. Fink, J.C. Schoneboom, P. Erk, P. Peumans, Effect of molecular packing on the exciton diffusion length in organic solar cells, Appl. Phys. Lett. 91, 173504 (2007) [CrossRef]
Publication Year: 2011
Publication Date: 2011-09-29
Language: en
Type: article
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Cited By Count: 5
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