Abstract
This chapter is dedicated to S-kinks in the J-V curve of organic solar cells. They are very interesting because they represent a pronounced feature in the J-V curve, which is related to a change in the working regime of the device. Often, they are manifest with decreased solar-cell performance. Consequently, it is desired to remove them based on the knowledge of their origin. In the previous chapter, barriers at electrodes have been discussed as possible reasons for S-kinks. In this chapter further sources of S-kinks are presented. We describe how a strong imbalance in mobilities (hole mobility in donor, electron mobility in acceptor) in flat heterojunction devices or a field-dependent dissociation of geminate pairs at the donor/acceptor interface causes S-kinks. In the final parts of this chapter “unconventional” kinks with turning points at voltages higher or lower than the open-circuit voltage are discussed. The following questions cover the content of this chapter: (a) Under what conditions can imbalanced mobilities cause S-shaped J-V curves? (b) What is the mechanism in which imbalanced mobilities cause S-shaped J-V curves? (c) How can this effect be identified and distinguished from others? (d) How can kinks in the forward current be explained? (e) What might be the reason for “unconventional” distortions of the J-V curve?
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Tress, W., Petrich, A., Hummert, M., Hein, M., Leo, K., Riede, M.: Imbalanced mobilities causing S-shaped IV curves in planar heterojunction organic solar cells. Appl. Phys. Lett. 98 063301, (2011)
Mihailetchi, V.D., Wildeman, J., Blom, P.W.M.: Space-charge limited photocurrent. Phys. Rev. Lett. 94, 126602 (2005)
Finck, B.Y., Schwartz, B.J.: Understanding the origin of the S-curve in conjugated polymer/fullerene photovoltaics from drift-diffusion simulations. App. Phys. Lett. 103, 053306 (2013)
Wehmeier, M., Wagner, M., Müllen, K.: Novel perylene chromophores obtained by a facile oxidative cyclodehydrogenation route. Chem.—A Eur. J. 7, 2197–2205 (2001)
Rand, B.P., Xue, J., Uchida, S., Forrest, S.R.: Mixed donor-acceptor molecular heterojunctions for photovoltaic applications. I. Material properties. J. Appl. Phys. 98, 124902 (2005)
Tress, W., Leo, K., Riede, M.: Photoconductivity as loss mechanism in organic solar cells. Phys. Status Solidi RRL-Rapid Res. Lett. 7, 401–405, (2013)
Petersen, A., Ojala, A., Kirchartz, T., Wagner, T.A., Würthner, F., Rau, U.: Field-dependent exciton dissociation in organic heterojunction solar cells. Phys. Rev. B 85 (2012), 245208.
Mandoc, M.M., Veurman, W., Koster, L.J.A., de Boer, B., Blom, P.W.M.: Origin of the reduced fill factor and photocurrent in MDMO-PPV:PCNEPV all-polymer solar cells. Adv. Funct. Mater. 17, 2167–2173 (2007)
Ojala, A., Petersen, A., Fuchs, A., Lovrincic, R., Pölking, C., Trollmann, J., Hwang, J., Lennartz, C., Reichelt, H., Höffken, H.W., Pucci, A., Erk, P., Kirchartz, T., Würthner, F.: Merocyanine/C60 planar heterojunction solar cells: effect of dye orientation on exciton dissociation and solar cell performance. Adv. Funct. Mater. 22, 86–96 (2012)
Tang, Z., Andersson, L.M., George, Z., Vandewal, K., Tvingstedt, K., Heriksson, P., Kroon, R., Andersson, M.R., Inganäs, O.: Interlayer for modified cathode in highly efficient inverted ITO-free organic solar cells. Adv. Mater. 24, 554–558 (2012)
Tang, Z., Tress, W., Bao, Q., Jafari, M. J., Bergqvist, J., Ederth, T., Andersson, M. R., Inganäs, O.: Improving cathodes with a polymer interlayer in reversed organic solar cells. Adv. Energy Mater. 4, 1400643 (2014)
Wang, E., Hou, L., Wang, Z., Hellström, S., Zhang, F., Inganäs, O., Andersson, M.R.: An easily synthesized blue polymer for high-performance polymer solar cells. Adv. Mater. 22, 5240–5244 (2010)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Copyright information
© 2014 Springer International Publishing Switzerland
About this chapter
Cite this chapter
Tress, W. (2014). Further Origins of S-shaped J-V Curves. In: Organic Solar Cells. Springer Series in Materials Science, vol 208. Springer, Cham. https://doi.org/10.1007/978-3-319-10097-5_7
Download citation
DOI: https://doi.org/10.1007/978-3-319-10097-5_7
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-10096-8
Online ISBN: 978-3-319-10097-5
eBook Packages: Chemistry and Materials ScienceChemistry and Material Science (R0)