Determining the Effect of Different Heat Treatments on the Electrical and Morphological Characteristics of Polymer Solar Cells

Jun Young Kim
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Jun Young Kim: Department of Semiconductor Engineering, Engineering Research Institute (ERI), Gyeongsang National University, 501 Jinju-daero, Jinju, Gyeongnam 52828, Korea

Energies, 2019, vol. 12, issue 24, 1-8

Abstract: The device characteristics of polymer solar cells can be improved through an annealing process. This is especially true of the carrier mobility and the light absorption of P3HT:PCBM, which improves considerably after the annealing process. In the standard structure using indium-tin-oxide (ITO) as an anode, most studies have focused on the post-annealing process, where thermal annealing is performed after device fabrication. This work reports the effects of different annealing methods for inverted polymer solar cells, using ITO as a cathode. Similar levels of light absorption and P3HT crystallinity were obtained regardless of the annealing procedure in the inverted structure. However, compared with the post-annealed device, the pre-annealed device, which was thermally annealed after deposition of the P3HT:PCBM film, exhibited better charge extraction, owing to the superior device resistances and larger MoO 3 grain size. Therefore, the pre-annealing method yields better performance than the post-annealing method.

Keywords: Inverted polymer solar cell; Heat treatment; Morphology; Impedance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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