Blade-coated sol-gel indium-gallium-zinc-oxide for inverted polymer solar cell

Yan Huei Lee, Pei Ting Tsai, Chia Ju Chang, Hsin Fei Meng, Sheng Fu Horng, Hsiao Wen Zan, Hung Cheng Lin, Hung Chuan Liu, Mei Rurng Tseng, Han Cheng Yeh

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Abstract

The inverted organic solar cell was fabricated by using sol-gel indium-gallium-zinc-oxide (IGZO) as the electron-transport layer. The IGZO precursor solution was deposited by blade coating with simultaneous substrate heating at 120 °C from the bottom and hot wind from above. Uniform IGZO film of around 30 nm was formed after annealing at 400 °C. Using the blend of low band-gap polymer poly[(4,8-bis-(2-ethylhexyloxy)-benzo(1,2-b:4,5-b')dithiophene)-2,6-diyl-alt- (4-(2-ethylhexanoyl)-thieno [3,4-b]thiophene-)-2-6-diyl)] (PBDTTT-C-T) and [6,6]-Phenyl C 71 butyric acid methyl ester ([70]PCBM) as the active layer for the inverted organic solar cell, an efficiency of 6.2% was achieved with a blade speed of 180 mm/s for the IGZO. The efficiency of the inverted organic solar cells was found to depend on the coating speed of the IGZO films, which was attributed to the change in the concentration of surface OH groups. Compared to organic solar cells of conventional structure using PBDTTT-C-T: [70]PCBM as active layer, the inverted organic solar cells showed significant improvement in thermal stability. In addition, the chemical composition, as well as the work function of the IGZO film at the surface and inside can be tuned by the blade speed, which may find applications in other areas like thin-film transistors.

Original languageEnglish
Article number115006
JournalAIP Advances
Volume6
Issue number11
DOIs
Publication statusPublished - Nov 1 2016
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Lee, Y. H., Tsai, P. T., Chang, C. J., Meng, H. F., Horng, S. F., Zan, H. W., Lin, H. C., Liu, H. C., Tseng, M. R., & Yeh, H. C. (2016). Blade-coated sol-gel indium-gallium-zinc-oxide for inverted polymer solar cell. AIP Advances, 6(11), [115006]. https://doi.org/10.1063/1.4967288