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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%.