Investigation on the Performance of an Organic Solar Cell by the Modification of Cathode with Lanthanum Fluoride Thin Layer
American Journal of Modern Physics
Volume 4, Issue 6, November 2015, Pages: 274-280
Received: Jul. 3, 2015;
Accepted: Jul. 9, 2015;
Published: Dec. 14, 2015
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Md. Shahinul Islam, Department of Applied Physics & Electronic Engineering, Rajshahi University, Rajshahi, Bangladesh
Golam Saklayen, Department of Applied Physics & Electronic Engineering, Rajshahi University, Rajshahi, Bangladesh
Hartmut Baerwolff, Department of Analog & Optoelectronics, Cologne University of Applied Sciences, Germany
Abu Bakar Md. Ismail, Department of Applied Physics & Electronic Engineering, Rajshahi University, Rajshahi, Bangladesh
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Performance of organic solar cell (OSC) using the modification of cathode has been investigated in this research. OSC has been fabricated using the blend of P3HT (poly (3-hexylthiophene)) and PCBM (Phenyl C61 butyric acid methylester) at 1:1 ratio. E-beam evaporated indium tin oxide (ITO) has been used as the anode. A novel bi-layer of e-beam-evaporated LaF3 and Al (LaF3/Al) has been used as the cathode. The morphology of the ITO, P3HT: PCBM and LaF3 layer has been investigated by Atomic Force Microscope (AFM). LaF3 layer between P3HT: PCBM and Al layer was found to influence the reverse current, open-circuit voltage and efficiency of OSC. Various thicknesses of LaF3 layer have been investigated, and 3nm thick LaF3 layer was found to be the optimum thickness for the enhancement of the various solar-cell parameters of our fabricated OSC. The effect of annealing on the performance of the cell has been also investigated. The post-fabrication annealed devices, with or without the LaF3 layer, exhibited higher values of short-circuit current, open-circuit voltage than those of similar devices annealed before depositing the Al metal. It was found that annealing at 150°C for 20 minutes provided the best result. The overall power conversion efficiency was found to enhance several times than that of the conventional structure of OSC having only Al as the cathode. Altogether the experimental results show that bi-layer of LaF3/Al cathode could enhance the overall performance of OSC.
Organic Solar Cell, P3HT: PCBM Polymer Photoactive Layer, Annealing, Bi-layer Cathode E-Beam Deposition, Thin Films, Surface Morphology, Surface Roughness, Open Circuit Voltage, Short Circuit Current
To cite this article
Md. Shahinul Islam,
Abu Bakar Md. Ismail,
Investigation on the Performance of an Organic Solar Cell by the Modification of Cathode with Lanthanum Fluoride Thin Layer, American Journal of Modern Physics.
Vol. 4, No. 6,
2015, pp. 274-280.
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