Influence of Thickness and Annealing Temperature on the Optical Properties of Spin-Coated Photoactive P3HT:PCBM Blend

DOI: 10.4236/opj.2013.38A004   PDF   HTML   XML   6,283 Downloads   8,347 Views   Citations


Influence of annealing temperature and thickness on the optical characteristics of the blend of poly (3-hexylthiophene) (P3HT) and Phenyl C61 butyric acid methylester (PCBM) layer has been investigated in this report. Photoactive polymer material (P3HT:PCBM) was deposited on indium tin oxide (ITO) substrate by spin-coating. The morphology of P3HT:PCBM composite layer was investigated by Atomic Force Microscope (AFM). The surface roughness was found to reduce after heat treatment. The absorption of the composite layer was found to increase with its number of layer (thickness). On the other hand, the photoluminescence (PL) quenching, which indicates efficient charge separation in the bulk heterojunction, was found higher for the thinner layer. Absorption was also found to increase with the annealing temperature. Therefore, to optimize the thickness of the P3HT:PCBM photoactive layer that will provide best absorption while providing efficient charge separation, annealing at optimized temperature might be an effective tool.

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M. Islam, M. Islam, A. Ismail and H. Baerwolff, "Influence of Thickness and Annealing Temperature on the Optical Properties of Spin-Coated Photoactive P3HT:PCBM Blend," Optics and Photonics Journal, Vol. 3 No. 8A, 2013, pp. 28-32. doi: 10.4236/opj.2013.38A004.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] P. Schilinsky, C. Waldauf and C. J. Brabec, “Recombination and Loss Analysis in Polythiophene Based Bulk Heterojunction Photodetectors,” Applied Physics Letters, Vol. 81, No. 20, 2002, p. 3885.
[2] F. Padinger, R. S. Rittberger and N. S. Sariciftci, “Effects of Postproduction Treatment on Plastic Solar Cells,” Advanced Functional Materials, Vol. 13, No. 1, 2003, pp. 85-88.
[3] D. Chirvase, J. Parisi, J. C. Hummelen and V. Dyakonov, “Influence of Nanomorphology on the Photovoltaic Action of Polymer-Fullerene Composites,” Nanotechnology, Vol. 15, No. 9, 2004, p. 1317.
[4] H. Sirringhaus, et al., “Two-Dimensional Charge Transport in Self-Organized, High-Mobility Conjugated Polymers,” Nature, Vol. 401, 1999, pp. 685-688.
[5] J. Y. Seong, et al., “Variational, Method for the Lowest Conduction Subband of Undoped AlGaN/GaN Single Heterojunctions,” Journal of the Korean Physical Society, Vol. 45, 2004, p. 5914.
[6] J. P. Zhou, X. H. Chen and Z. Xu, “Influence of P3HT: PCBM Film Formation Process on the Performance of Polymer Solar Cells,” Spectroscopy and Spectral Analysis, Vol. 31, No. 10, 2011, pp. 2684-2687
[7] A. Ng, Y. C. Sun, M. K. Fung, A. M. C. Ng, Y. H. Leung, A. B. Djurisic and W. K. Chan, “Influence of the Polymer Processing Conditions on the Performance of Bulk Heterojunction Solar Cells,” SPIE Proceedings, Organic Photonic Materials and Devices XIV, Vol. 8258, 2012, 82581E.
[8] V. S. Balderrama, et al., “Influence and Relationship of Film Morphology on Organic Solar Cells Manufactured with Different P3HT:PC[70]BM Blend Solutions,” 8th International Conference on Electrical Engineering Computing Science and Automatic Control, Vol. 1, No. 5, 2011, pp. 26-28.
[9] P. Kumer, et al., “Effect of Thermal Treatment on the Performance of Organic Bulk-Hetrojunction Photovoltaic Devices, Physics of Semiconductor Devices,” International Workshop on IWPSD, Mumbai, 16-20 December 2007, pp. 16-20.
[10] W. R. Salaneck, et al., “Thermochromism in Poly(3-Hexylthiophene) in the Solid State: A Spectroscopic Study of Temperature-Dependent Conformational Defects,” Journal of Chemical Physics, Vol. 89, No. 8, 1988, p. 4613.
[11] Y. Zhao, G. Yuan, P. Reche and M. Lecerc, “A Calorimetric Study of the Phase Transitions in Poly(3-Hexylthiophene),” Polymer, Vol. 36, No. 11, 1995, pp. 2211-2214.
[12] P. J. Brown, H. Sirringhaus, M. Harrison, M. Shkunov and R. H. Friend, “Optical Spectroscopy of Field-Induced Charge in Self-Organized High Mobility Poly(3-Hexylthiophene),” Physical Review B, Vol. 63, No. 12, 2001, Article ID: 125204.
[13] X. Yang, et al., “Nanoscale Morphology of High-Performance Polymer Solar Cells,” Nano Letters, Vol. 5, No. 4, 2005, pp. 579-583.
[14] A. Zen, et al., “Effect of Molecular Weight and Annealing of Poly(3-Hexylthiophene)s on the Performance of Organic Field-Effect Transistors,” Advanced Functional Materials, Vol. 14, No. 8, 2004, pp. 757-764.
[15] M. Al-Ibrahim, O. Ambacher, S. Sensfuss and G. Gobsch, “Effects of Solvent and Annealing on the Improved Performance of Solar Cells Based on Poly(3-Hexylthiophene): Fullerene,” Applied Physics Letters, Vol. 86, No. 20, 2005, Article ID: 201120.
[16] Y. Kim, et al., “Device Annealing Effect in Organic Solar Cells with Blends of Regioregular Poly(3-Hexylthiophene) and Soluble Fullerene,” Applied Physics Letters, Vol. 86, No. 6, 2005, Article ID: 063502.
[17] G. Li, et al., “High-Efficiency Solution Processable Polymer Photovoltaic Cells by Self-Organization of Polymer Blends,” Nature Materials, Vol. 4, 2005, pp. 864-868.
[18] W. L. Ma, C. Y. Yang, X. Gong, K. Lee and A. J. Heeger, “Thermally Stable, Efficient Polymer Solar Cells with Nanoscale Control of the Interpenetrating Network Morphology,” Advanced Functional Materials, Vol. 15, No. 10, 2005, pp. 1617-1622.
[19] H. Sirringhaus, et al., Two-Dimensional Charge Transport in Self-Organized, High-Mobility Conjugated Polymers,” Nature, Vol. 401, 1999, pp. 685-688.
[20] B. K. Kuila and A. K. Nandi, “Physical, Mechanical, and Conductivity Properties of Poly(3-hexylthiophene)-Montmorillonite Clay Nanocomposites Produced by the Solvent Casting Method,” Macromolecules, Vol. 37, No. 23, 2004, pp. 8577-8584.
[21] M. Drees, R. M. Davis and J. R. Heflin, “Thickness Dependence, in Situ Measurements, and Morphology of Themally-Controlled Interdiffusion in Polymer-C60 Photovoltaic Devices,” Physical Review B, Vol. 69, No. 16, 2004, Article ID: 165320.
[22] H. Ohkita and S. Ito, “Transient Absorption Spectroscopy of Polymer-Based Thin-Film Solar Cells,” Polymer, Vol. 52, No. 20, 2011, pp. 4397-4417.
[23] A. J. Moule, et al., “The Effect of Active Layer Thickness and Composition on the Performance of Bulk-Heterojunction Solar Cells,” Journal of Applied Physics, Vol. 100, No. 9, 2006, Article ID: 094503.
[24] H. Kim, W.-W. So and S.-J. Moon, “Effect of Thermal Annealing on the Performance of P3HT/PCBM Polymer Photovoltaic Cells,” Journal of the Korean Physical Society, Vol. 48, 2006, pp. 441-445.

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