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Roll-To-Roll Printing of Meter-Scale Composite Transparent Electrodes with Optimized Mechanical and Optical Properties for Photoelectronics
- Meng, Xiangchuan, Hu, Xiaotian, Yang, Xia, Yin, Jingping, Wang, Qingxia, Huang, Liqiang, Yu, Zoukangning, Hu, Ting, Tan, Licheng, Zhou, Weihua, Chen, Yiwang
- ACS applied materials & interfaces 2018 v.10 no.10 pp. 8917-8925
- electrodes, energy, indium tin oxide, polyethylene terephthalates, refractive index, silver, solar cells, transmittance, viscosity
- Flexible transparent electrodes are an indispensable component for flexible optoelectronic devices. In this work, the meter-scale composite transparent electrodes (CTEs) composed of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) and Ag grid/polyethylene terephthalate (PET) with optimized mechanical and optical properties are demonstrated by slot–die roll-to-roll technique with solution printing method under a low cost ($15–20 per square meter), via control of the viscosity and surface energy of PEDOT:PSS ink as well as the printing parameters. The CTEs show excellent flexibility remaining 98% of the pristine value after bending 2000 times under various bending situations, and the square resistance (Rₛ) of CTEs can be reduced to 4.5–5.0 Ω/sq with an appropriate transmittance. Moreover, the optical performances, such as haze, extinction coefficient, and refractive index, are investigated, as compared with indium tin oxide/PET, which are potential for the inexpensive optoelectronic flexible devices. The CTEs could be successfully employed in polymer solar cells with different areas, showing a maximal power conversion efficiency of 8.08%.