Abstract
The photocurrent spectra (PCS)of the ITO (indium tin oxide)/PEDOT:PSS(poly(3,4-ethylenedioxythiophene)-oly(styrenesulfonate))/P3HT:PCBM(poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C61-butyric acid methyl ester)/Al organic photovoltaic devices(OPVs) with six different thicknesses of P3HT:PCBM layer, ranging from 80 to 345 nm,were measured under monochromatic visible light for the reverse voltage range from \(-4\) to \(0 \text{V}\).The measured PCS showed a good correlation with the P3HT:PCBM absorption spectrum for thinner devices, while for thicker OPVs a pronounced red shift in PCS was observed. As this PCS behavior is usually explained by the surface recombination effects at electrode contacts, a drift–diffusion model (DDM), which includes charge carrier surface recombination and thermal injection on the anode and cathode through boundary conditions, was used for the PSC simulations. The experimentally obtained normalized PCS were very well reproduced by the DDM when absorption and charge carrier photogeneration in P3HT:PCBM thin films were assumed to follow the Beer-Lambert law, and surface recombination at electrode contacts was negligible. Further, the effect of surface recombination on normalized PCS was analyzed in detail by reducing the surface recombination velocity (SRV) in the DDM calculations for either majority or minority charge carriers at one of the electrodes. Also, the DDM calculations were conducted for the cases of electron dominated, balanced, and hole dominated transport in the OPVs active layer. It was concluded that only the reduction of SRV for majority carriers at the electrode which extracts faster carriers affects the normalized PCS. For balanced hole and electron transport the surface recombination had no influence on the normalized PCS.
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References
Abeyweera, B.K., Alphenaar, B.W.: Thickness dependent red shift of the photocurrent spectrum in bulk heterojunctionsolar cells. Appl. Phys. Lett. 102(1–3), 041113 (2013). https://doi.org/10.1063/1.4789905
Chen, L.X.: Organic solar cells: recent progress and challenges. ACS Energy Lett. 4(10), 2537–2539 (2019). https://doi.org/10.1021/acsenergylett.9b02071
Desarmeaux, A., Max, J.J., Leblanc, R.M.: Photovoltaic and electrical properties of Al/Langmuir-blodgett Films/ag sandwich cellsincorporating either Chlorophyll a, Chlorophyll b, or zinc porphyrin derivative. J. Phys. Chem. 97, 6670–6678 (1993). https://doi.org/10.1021/j100127a017
DeVore, H.B.: Spectral distribution of photoconductivity. Phys. Rev. 102, 86–91 (1956). https://doi.org/10.1103/PhysRev.102.86
Ghosh, A.K., Feng, T.: Merocyanine organic solar cells. J. Appl. Phys. 49, 5982 (1978). https://doi.org/10.1063/1.324566
Ghosh, A.K., Morel, D.L., Feng, T., Shaw, R.F., Rowe, C.A., Jr.: Photovoltaic and rectification properties of Al/Mgphthalocyanine/Ag Schottky-barrier cells. J. Appl. Phys. 45(1), 230–236 (1974). https://doi.org/10.1063/1.1662965
Harrison, M.G., Gruner, J., Spencer, G.C.W.: Analysis of the photocurrent action spectra of MEH-PPV polymer photodiodes. Phys. Rev. B 55(12), 15 (1997). https://doi.org/10.1103/PhysRevB.55.7831
Jelić, Ž, Petrović, J., Matavulj, P., Melancon, J., Sharma, A., Zellhofer, C., Živanović, S.: Modeling of the polymer solar cell with P3HT:PCBM active layer. Phys.Scr. T162, 014035 (2014). https://doi.org/10.1088/0031-8949/2014/T162/014035
Khalf, A.R., Gojanović, J.P., Cirović, N.A., Živanović, S., Matavulj, P.S.: The impact of surface processes on the J–V characteristics of organic solar cells. IEEE J. Photovolt. 10(2), 514–521 (2020)
Petrović, J.P., Matavulj, P.S., Pinto, L.R., Thapa, A., Živanović, S.R.: Thickness dependent absorption and polaron photogeneration in poly-(2-metoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene-vinylene). J. Appl. Phys. 111, 124512 (2012). https://doi.org/10.1063/1.4729770
Scheunemann, D., Wilken, S., Sandberg, O.J., Österbacka, R., Schiek, M.: Effect of imbalanced charge transport on the interplay of surface and bulk recombination in organic solar cells. Phys. Rev. Appl. 11, 054090 (2019). https://doi.org/10.1103/PhysRevApplied.11.054090
Tang, C.W., Albrecht, A.C.: Photovoltaic effects of metal–chlorophyll-a–metal sandwich cells. J. Chem. Phys. 62(6), 15 (1975). https://doi.org/10.1063/1.430780
Ullrich, B., Xi, H.: Theoretical analysis of the spectral photocurrent distribution of semiconductors. In: Pyshkin, S. (ed.) Optoelectronics - Advanced Materials and Devices. InTech, London (2013)
Vlahović, J., Stanojević, M., Gojanović, J., Melancon, J., Sharma, A., Živanović, S.: Thickness dependent photocurrent spectra andcurrent-voltage characteristics of P3HT:PCBMphotovoltaic devices. Opt. Exp. 29(6), 8710–8724 (2021). https://doi.org/10.1364/OE.418082
Vollbrecht, J., Brus, V.V.: On the recombination order of surface recombination under opencircuit conditions. Org. Electron. 86, 105905 (2020). https://doi.org/10.1016/j.orgel.2020.105905
Vollbrecht, J., Brus, V.V., Ko, S.-J., Lee, J., Karki, A., Cao, D.X., Cho, K., Bazan, G.C., Nguyen, T.-Q.: Quantifying the nongeminate recombination dynamics in nonfullerene bulk heterojunction organic solar cells. Adv. Energy Mater. (2019). https://doi.org/10.1002/aenm.201901438
Wagenpfahl, A., Rauh, D., Binder, M., Deibel, C., Dyakonov, V.: S-shaped current-voltage characteristics of organic solar devices. Phys. Rev. B 82, 115306 (2010). https://doi.org/10.1103/PhysRevB.82.115306
Yin, Z., Wei, J., Zheng, Q.: Interfacial materials for organic solar cells: recent advances and perspectives. Adv. Sci. 3(8), 1500362 (2016). https://doi.org/10.1002/advs.201500362
Zhang, M., Zhu, L., Zhou, G., et al.: Single-layered organic photovoltaics with double cascading charge transport pathways: 18% efficiencies. Nat. Commun. 12, 309 (2021). https://doi.org/10.1038/s41467-020-20580-8
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This work is partially supported by the James W. Adams endowed professorship of S. Zivanovic.
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The funding was provided by Serbian Ministry of Education, Science and Technological Development under contract No. 62101.
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Khalf, A., Gojanović, J., Melancon, J. et al. Surface recombination influence on photocurrent spectra of organic photovoltaic devices. Opt Quant Electron 54, 653 (2022). https://doi.org/10.1007/s11082-022-03975-3
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DOI: https://doi.org/10.1007/s11082-022-03975-3