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Fabrication of PEDOT films via a facile method and their application in Pt-free dye-sensitized solar cells
- Li, Yin-Chang, Jia, Song-Ru, Liu, Zhi-Yan, Liu, Xue-Qin, Wang, Yang, Cao, Ya, Hu, Xiao-Qin, Peng, Cheng-Long, Li, Zhen
- Journal of materials chemistry A 2017 v.5 no.17 pp. 7862-7868
- electric potential difference, electrochemistry, electrodes, graphene oxide, microparticles, nanoparticles, platinum, polymerization, solar cells
- Poly(3,4-ethylenedioxythiophene) (PEDOT) has attracted much attention in the application of dye-sensitized solar cells (DSSCs) due to its outstanding photovoltaic property. PEDOT films were synthesized in a three-electrode system with a direct-current power supply to control the polymerization process, leading to a simplification of the electrochemical polymerization procedure. The morphology of PEDOT can be represented as a micro-sphere with three-dimensional network-like structures aggregated with plenty of nanoparticles. The polymerization voltage, polymerization time and the concentration of 3,4-ethylenedioxythiophene (EDOT) exhibited a significant influence on the photovoltaic characteristics of PEDOT films. Impressively, the DSSCs with optimum PEDOT films as counter electrodes (CEs) reached the highest power conversion efficiency (η) of 6.401%, which was comparable to that of a cell with platinum (Pt) CEs (6.493%). After modification by reduced graphene oxide (rGO), DSSCs equipped with PEDOT/rGO CEs reached an η of 7.115%, with an enhancement of 9.58% compared to that of Pt CEs. Thus, the rGO-coated network-like PEDOT can be considered as an economical alternative component to expensive Pt electrodes.