Effect of Thickness and Composition Ratio of Poly(3-Hexylthiophene) and [6,6]-Phenyl C60-Butyric Acid Methyl Ester Thin Film on Optical Absorption for Organic Solar Cell Fabrication
Journal of Photonic Materials and Technology
Volume 5, Issue 1, June 2019, Pages: 5-10
Received: Feb. 21, 2019;
Accepted: Apr. 4, 2019;
Published: May 6, 2019
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Sunday Wilson Balogun, Department of Materials Science and Engineering Laboratory, Kwara State University Malete, Ilorin, Nigeria
Yekini Kolawole Sanusi, Department of Materials Science and Engineering Laboratory, Kwara State University Malete, Ilorin, Nigeria; Department of Pure and Applied Physics, Ladoke Akintola University of Technology, Ogbomoso, Nigeria
A Blend of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C60-butyric acid methyl ester (PCBM), a fullerene derivate based donor-acceptor copolymer, is one of the widely used organic solar cell materials for photon-electron conversion. Thin films were developed, characterized, and optimized for optical absorbance. Absorption spectra were measured using a UV-VIS spectrophotometer. In this work, the effects of composition ratios of P3HT:PC60BM and various thicknesses was studied in ambient conditions. The P3HT:PC61BM thin film was deposited in two different composition ratio (1:1 and 1:3) and fabricated at seven different thicknesses of 20 nm, 30 nm, 35 nm, 87 nm, 98 nm, 115 nm, and 146 nm corresponding to spin coating speeds of 4000rpm, 3000rpm, 2000rpm, 1500rpm, 1250rpm, 1000rpm, and 750rpm, respectively. P3HT:PC60BM thin film composition ratio of 1:1 with thickness of 87nm shows relatively better photon absorption optical parameter than P3HT:PC60BM composition ratio of 1:3. P3HT: PC61BM solution coated at a spin speed of 1500 rpm shows a better absorption of photon energy. The results showed that the optimum thickness of the thin film is 87 nm at composition ratio of 1:1. Energy band gap values of composition ratio of 1:3 is observed to decreases with increase in spin- speed from 3.9 eV to 3.7 eV. The results can be used as a guideline for improving the design and fabrication of active layer of organic solar cells.
Sunday Wilson Balogun,
Yekini Kolawole Sanusi,
Effect of Thickness and Composition Ratio of Poly(3-Hexylthiophene) and [6,6]-Phenyl C60-Butyric Acid Methyl Ester Thin Film on Optical Absorption for Organic Solar Cell Fabrication, Journal of Photonic Materials and Technology.
Vol. 5, No. 1,
2019, pp. 5-10.
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