Effect of Seed Layer on the Morphology of ‎Zinc Oxide Nanorods as an Electron ‎Transport Layer in Polymer Solar Cells ‎

Document Type : Research Paper

Authors

Department of Chemistry, Amirkabir University of Technology, Tehran, Iran.‎

Abstract

   Zinc oxide has been considered as a promising semiconductor material for fabrication of transparent conductive oxides (TCOs), electronic devices, optoelectronics, and solar cells. Among the various morphologies of zinc oxide, nanorods are more widely used because of the ease of synthesis and providing a direct path for the transport of charge carriers. The electrochemical deposition method (ECD), due to its simplicity, low cost, and production of nanostructures with fewer defects is a more suitable method for producing zinc oxide nanorods. Heretofore, the effect of different parameters such as the temperature of growth solution, the concentration of precursors and pH on the morphology of the final product were studied. In this paper, the effect of the seed layer number on morphology, absorption, and electrical conductivity of zinc oxide nanorods was investigated using SEM images, UV-Vis spectroscopy, and four-point probe. The results showed that increasing the number of seed layers from 0 to 5 lead to the production of vertical, uniform, regular, and high-density nanorods. Also, the use of high-density zinc oxide nanorods, in the structure of polymer solar cells increased the performance of polymer solar cells by 68%. The polymer solar cell with zinc oxide nanorods as the electron transport layer showed short-circuit current, open-circuit voltage, and the power conversion efficiency of equal to 9.04 mA/cm2, 0.53V, and 2.51%, respectively.

Keywords


  1. Pham, N. A., Nguyen, T. H. N., Tran, T. N., Nguyen, Q. T., Le, T. K., (2017). "Immobilization of ZnO nanoparticles on fluorinated perlite granules for the photocatalytic degradation of methylene blue", Vietnam Journal of Science, Technology and Engineering, 59: 25-31.
  2. Holi, A. M., Zainal, Z., Ayal, A. K., Chang, S. K., Lim, H. N., Talib, Z. A., (2018). "Effect of heat treatment on photoelectrochemical performance of hydrothermally synthesised Ag2S/ZnO nanorods arrays", Chemical Physics Letters, 710: 100-107.
  3. Govatsi, K., Seferlis, A., Neophytides, S. G., Yannopoulos, S., (2018). "Influence of the morphology of ZnO nanowires on the photoelectrochemical water splitting efficiency", International Journal of Hydrogen Energy, 43: 4866-4879.
  4. Choi, K. S., Chang, S. P., (2018). "Effect of structure morphologies on hydrogen gas sensing by ZnO nanotubes", Materials Letters, 230: 48-52.
  5. Zhu, L., Li, Y., Zeng, W., (2018). "Hydrothermal synthesis of hierarchical flower-like ZnO nanostructure and its enhanced ethanol gas-sensing properties", Applied Surface Science, 427: 281-287.
  6. Jiao, Y., Liu, Y., Yin, B., Zhang, S., Qu. F., Wu, X., (2013). "Facile hydrothermal approach to ZnO nanorods at mild temperature", Journal of Nanomaterials, 2013: 7.
  7. Fiefhaus, S. R., (2016). "The Optimization of The Synthesis and Characterization of Vapor-Liquid-Solid Grown ZnO Nanowires", University of Kentucky.
  8. Chen, Y., Liu, Y., Lu, S., Xu, C., Shao, C., Wang, C., (2005). "Optical properties of ZnO and ZnO: In nanorods assembled by sol-gel method", The Journal of chemical physics, 123: 134701.
  9. Divya, B., Karthikeyan, C., Rajasimman, M., (2018). "Chemical Synthesis of Zinc Oxide Nanoparticles and Its Application of Dye Decolourization", International Journal of Nanoscience and Nanotechnology, 14: 267-275.
  10. Hu, L., (2014). "Electrochemical Growth and Characterization of ZnO Nanowires", University of Waterloo.
  11. Martinson, A. B., McGarrah, J. E., Parpia, M. O., Hupp, J. T., (2006). "Dynamics of charge transport and recombination in ZnO nanorod array dye-sensitized solar cells", Physical Chemistry Chemical Physics, 8: 4655-4659.
  12. Alaie, Z., Mohammad Nejad, S., Yousefi, M. H., Safarzadeh, S., (2016). "The Effects of Different Seed Layers and Growth Time on the Quality of ZnO NRs Arrays", International Journal of Nanoscience and Nanotechnology, 12: 119-130.
  13. Song, J., Lim, S., (2007). "Effect of seed layer on the growth of ZnO nanorods", The Journal of Physical Chemistry C, 111: 596-600.
  14. Sacramento, A., Ramirez-Como, M., Balderrama, V. S., Garduno, S. I., Estrada, M., Marsal, L. F., (2020). "Inverted Polymer Solar Cells Using Inkjet Printed ZnO as Electron Transport Layer: Characterization and Degradation Study", Journal of the Electron Devices Society.
  15. Park, S., Kang, R., Cho, S., (2020). "Effect of an Al-doped ZnO electron transport layer on the efficiency of inverted bulk heterojunction solar cells", Current Applied Physics, 20: 172-177.
  16. Zafar, M., Kim, B., Kim, D. H., (2020). "Improvement in performance of inverted organic solar cell by rare earth element lanthanum doped ZnO electron buffer layer", Materials Chemistry and Physics, 240: 122076.
  17. Khelladi, M., Mentar, L., Beniaiche, A., Makhloufi, L., Azizi, A., (2013). "A study on electrodeposited zinc oxide nanostructures", Journal of Materials Science: Materials in Electronics, 24: 153-159.
  18. Shrama, S. K., Saurakhiya, N., Barthwal, S., Kumar, R., Sharma, A., (2014). "Tuning of structural, optical, and magnetic properties of ultrathin and thin ZnO nanowire arrays for nano device applications", Nanoscale research letters, 9: 122.
  19. Ty, J. T. D., Yanagi, H., (2015). "Electrochemical deposition of zinc oxide nanorods for hybrid solar cells", Japanese Journal of Applied Physics, 54: 04DK05.
  20. Zak, A. K., Razali, R., Majid, W. A., Darroudi, M., (2011). "Synthesis and characterization of a narrow size distribution of zinc oxide nanoparticles", International journal of nanomedicine, 6: 1399.
  21. Seow, Z., Wong, A., Thavasi, V., Jose, R., Ramakrishna, S., Ho, G., (2008). "Controlled synthesis and application of ZnO nanoparticles, nanorods and nanospheres in dye-sensitized solar cells", Nanotechnology, 20: 045604.
  22. Babu, K. S., Reddy, A. R., Sujatha, C., Reddy, K. V., Mallika, A., (2013). "Synthesis and optical characterization of porous ZnO", Journal of Advanced Ceramics, 2: 260-265.
  23. Musa, I., Qamhieh, N., Mahmoud, S. T., (2017). "Synthesis and length dependent photoluminescence property of zinc oxide nanorods", Results in physics, 7: 3552-3556.
  24. Lee, T. H., Sue, H. J., Cheng, X., (2011). "ZnO and conjugated polymer bulk heterojunction solar cells containing ZnO nanorod photoanode", Nanotechnology, 22: 285401.
  25. Zafar, M., Yun, J. Y., Kim, D. H., (2017). "Performance of inverted polymer solar cells with randomly oriented ZnO nanorods coupled with atomic layer deposited ZnO", Applied Surface Science, 398: 9-14.
  26. Ullah, I., Shah, S. K., Wali, S., Hayat, K., Khattak, S. A., Khan, A., (2017). "Enhanced efficiency of organic solar cells by using ZnO as an electron-transport layer", Materials Research Express, 4: 125505.