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    • ISSN: 1793-821X
    • Frequency: Quarterly (2013-2014); Bimonthly (Since 2015)
    • DOI: 10.18178/JOCET
    • Editor-in-Chief: Prof. Haider F. Abdul Amir
    • Executive Editor: Ms. Julia S. Ma
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Editor-in-chief
School of Science and Technology Universiti Malaysia Sabah, Malaysia.
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JOCET 2017 Vol.5(5): 371-377 ISSN: 1793-821X
DOI: 10.18178/JOCET.2017.5.5.400

Making Heterojunction Solar Cell Structure with Two Doner Polymer Materials and the Effect of Annealing Temperature

Young Chan Kim
Abstract—The organic solar cells have narrower absorption spectrum than inorganic ones, making the task of widening such narrow absorption spectrum of the organic solar cell extremely important for increasing the efficiency of organic solar cells. There has been studies on creating a tandem structure with donor materials with complementary absorption spectrums to maximize the absorption spectrum, but this method results in a complex manufacturing process, because tandem solar cells (whether serialized or parallelized) required intermediate layers. One of the proposed solutions is manufacturing solar cells with heterojunction structure, called a ternary solar cell. In this study, a simple heterojunction ternary solar cell was made using P3HT and PTB7 (two polymer materials with stepped energy levels) as donor materials, and PC61BM (a fullerene conductor) as a common acceptor. P3HT and PTB7 each have an absorption peak of 550nm and 650nm, capable of absorbing both relatively short and long wavelengths of light. Therefore, this structure increased the absorption spectrum and the photo current compared to when only one material was used. The P3HT:PC61BM solar cell had JSC of 8.473mA/cm2, PCE of 2.97%, and the PTB7:PC61BM solar cell had JSC of 10.96mA/cm2, PCE of 3.77%, but the P3HT:PTB7:PC61BM ternary structure had JSC of 11.949mA/cm2, PCE of 4.02%. Also, the current-voltage characteristics of the P3HT:PTB7:PC61BM ternary solar cell was measured under annealing temperatures from 80°C to 140°C to find the optimal annealing temperature for the ternary solar cell. The optimal annealing temperature was found to be 90°C, which is closer to the 80°C of PTB7 (which is weaker to heat), which confirmed that if two materials with different heat stability were used in a ternary structure, the one with the lower annealing temperature restricted the total efficiency.

Index Terms—Absorption spectrum, fullerene derivatives, Heterojunction structure (ternary solar cell), organic solar cell, polymer materials with stepped energy levels, optimal annealing temperature.

Young Chan Kim is with the Stanford Online High School (e-mail: youngchankim27@gmail.com).

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Cite:Young Chan Kim, "Making Heterojunction Solar Cell Structure with Two Doner Polymer Materials and the Effect of Annealing Temperature," Journal of Clean Energy Technologies vol. 5, no. 5, pp. 371-377, 2017.

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