Document Type : Research Paper

Author

Department of Basic Science, Farhangian University, Tehran, Iran.

Abstract

This study aimed to calculate the drift velocity and mobility of holes in organic semiconducting polymers by the Charge Extraction via Linearly Increasing Voltage (CELIV) technique to measure the charge carrier mobility. The charge carrier mobility is defined as carrier drift velocity v in each electric field E. This technique is complementary to Time of Flight (ToF) by providing us with an indication of the material’s properties when other methods are not applicable. Typically, Photo-CELIV is used to measure the charge carrier mobility in Organic Semiconductor (OSCs) due to large bandgap (2 eV) and few thermally generated carriers for extraction in the dark. The effect of the recombination mechanism is investigated on the carrier mobility in the organic layer. The calculation results showed that saturation of extracted charge is linearly proportional to carrier concentration at low concentrations, whereas at high density is saturated due to bimolecular carrier recombination. Langevin recombination mechanisms show that extracted demand saturates at j0, the capacitive displacement current step. Therefore, Δj/j0=1 at high light intensities, the saturation of extracted charge will start to decrease from its maximum value only when tdel is increased to be like tmax. In Langevin recombination, the bimolecular carrier lifetime is much faster than transit time at high carrier concentrations giving the saturation of extracted charge.

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Main Subjects

[1]     Kreouzis, T., Poplavskyy, D., Tuladhar, S. M., Campoy-Quiles, M., Nelson, J., Campbell, A. J., & Bradley, D. D. C. (2006). Temperature and field dependence of hole mobility in poly (9, 9-dioctylfluorene). Physical review b, 73(23), 235201. https://doi.org/10.1103/PhysRevB.73.235201
[2]     Majewski, L. A., Schroeder, R., Voigt, M., & Grell, M. (2004). Low voltage organic transistors on a polymer. Journal of physics D: applied physics, 37(3367), 337–347.
[3]     Majewski, L. A., Schroeder, R., Grell, M., Glarvey, P. A., & Turner, M. L. (2004). High capacitance organic field-effect transistors with modified gate insulator surface. Journal of applied physics, 96(10), 5781–5787.
[4]     Steudel, S., De Vusser, S., De Jonge, S., Janssen, D., Verlaak, S., Genoe, J., & Heremans, P. (2004). Influence of the dielectric roughness on the performance of pentacene transistors. Applied physics letters, 85(19), 4400–4402.
[5]     Mahmoudloo, A., & Ahmadi-Kandjani, S. (2016). Variable range hopping transport characteristics of the charge carriers in homogenous amorphous organic semiconductors. Optik, 127(3), 1265–1267. https://doi.org/10.1016/j.ijleo.2015.10.112
[6]     Pankratov, E. L. (2022). Influence of missmatch-induced stress and porosity of materials on technological process. International journal of research in industrial engineering (2783-1337), 11(2), 92-118.
[7]     Schrader, M., Körner, C., Elschner, C., & Andrienko, D. (2012). Charge transport in amorphous and smectic mesophases of dicyanovinyl-substituted oligothiophenes. Journal of materials chemistry, 22(41), 22258–22264.
[8]     Liu, C., Huang, K., Park, W. T., Li, M., Yang, T., Liu, X., … & Noh, Y. Y. (2017). A unified understanding of charge transport in organic semiconductors: the importance of attenuated delocalization for the carriers. Materials horizons, 4(4), 608–618.
[9]     Ucal Sari, I., & Ak, U. (2022). Machine efficiency measurement in industry 4.0 using fuzzy data envelopment analysis. Journal of fuzzy extension and applications, 3(2), 177–191.
[10]   Street, R. A., Northrup, J. E., & Salleo, A. (2005). Transport in polycrystalline polymer thin-film transistors. Physical review B, 71(16), 165202. https://doi.org/10.1103/PhysRevB.71.165202
[11]   Fritz, S. E., Kelley, T. W., & Frisbie, C. D. (2005). Effect of dielectric roughness on performance of pentacene TFTs and restoration of performance with a polymeric smoothing layer. The journal of physical chemistry b, 109(21), 10574–10577.
[12]   Shin, K., Yang, C., Yang, S. Y., Jeon, H., & Park, C. E. (2006). Effects of polymer gate dielectrics roughness on pentacene field-effect transistors. Applied physics letters, 88(7). https://doi.org/10.1063/1.2176858
[13]   Sosorev, A. Y. (2020). Simple charge transport model for efficient search of high-mobility organic semiconductor crystals. Materials & design, 192, 108730. https://doi.org/10.1016/j.matdes.2020.108730
[14]   Tunc, A. V., De Sio, A., Riedel, D., Deschler, F., Da Como, E., Parisi, J., & Von Hauff, E. (2012). Molecular doping of low-bandgap-polymer: fullerene solar cells: Effects on transport and solar cells. Organic electronics, 13(2), 290–296.
[15]   Panda, A., & Muniz, S. M. (2022). Smart home with neural network based object detection. Big data and computing visions, 2(1), 40–48.
[16]   Maennig, B., Pfeiffer, M., Nollau, A., Zhou, X., Leo, K., & Simon, P. (2001). Controlled p-type doping of polycrystalline and amorphous organic layers: Self-consistent description of conductivity and field-effect mobility by a microscopic percolation model. Physical review B, 64(19), 195208. https://doi.org/10.1103/PhysRevB.64.195208
[17]   Österbacka, R., Pivrikas, A., Juška, G., Poškus, A., Aarnio, H., Sliaužys, G., … Sariciftci, N. S. (2010). Effect of 2-d delocalization on charge transport and recombination in bulk-heterojunction solar cells. IEEE journal of selected topics in quantum electronics, 16(6), 1738–1745.
[18]   Gregg, B. A. (2009). Charged defects in soft semiconductors and their influence on organic photovoltaics. Soft matter, 5(16), 2985–2989.
[19]   Gregg, B. A. (2009). Transport in charged defect-rich π-Conjugated polymers. The journal of physical chemistry c, 113(15), 5899–5901.
[20]   Hamidzadeh, S. M., Rezaei, M., & Ranjbar-Bourani, M. (2022). A new dynamical behaviour modeling for a four-level supply chain: control and synchronization of hyperchaotic. Journal of applied research on industrial engineering, 9(2), 288–301.
[21]   Stelzl, F. F., & Würfel, U. (2012). Modeling the influence of doping on the performance of bulk heterojunction organic solar cells: One-dimensional effective semiconductor versus two-dimensional donor/acceptor model. Physical review B, 86(7), 75315. https://doi.org/10.1103/PhysRevB.86.075315
[22]   Kotlarski, J. D., Blom, P. W. M., Koster, L., Lenes, M., & Slooff, L. H. (2008). Combined optical and electrical modeling of polymer: fullerene bulk heterojunction solar cells. Journal of applied physics, 103(8). https://doi.org/10.1063/1.2905243
[23]   Liang, C., Wang, Y., Li, D., Ji, X., Zhang, F., & He, Z. (2014). Modeling and simulation of bulk heterojunction polymer solar cells. Solar energy materials and solar cells, 127, 67–86.
[24]   Rezzonico, D., Perucco, B., Knapp, E., Häusermann, R., Reinke, N. A., Müller, F., & Ruhstaller, B. (2011). Numerical analysis of exciton dynamics in organic light-emitting devices and solar cells. Journal of photonics for energy, 1(1), 11005. https://doi.org/10.1117/1.3528045
[25]   Ray, B., & Alam, M. A. (2012). Random vs regularized OPV: Limits of performance gain of organic bulk heterojunction solar cells by morphology engineering. Solar energy materials and solar cells, 99, 204–212.