Triumphing over Charge Transfer Limitations of PEDOT Nanofiber Reduction Catalyst by 1,2-Ethanedithiol Doping for Quantum Dot Solar Cells

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• 作者：Tea-Yon Kim ; Tae Kyung Lee ; Byung Su Kim ; Seul Chan Park ; Sungjin Lee ; Seung Soon Im ; Juan BisquertYong Soo Kang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 18, 2017
• 年：2017
• 卷：9
• 期：2
• 页码：1877-1884
• 全文大小：456K
• ISSN：1944-8252

文摘

Charge transfer between a conducting polymer-based counter electrode (CE) and a polysulfide (S^2–/S_n^2–) electrolyte mediator is a key limitation to improvements of solar energy conversion efficiency (ECE) in quantum-dot-sensitized solar cells (QDSCs). In this paper, 1,2-ethanedithiol (EDT) was doped into nanofibrous poly(3,4-ethylenedioxythiophene) (PEDOT NF) to overcome the charge transfer limitation between PEDOT NF and S^2–/S_n^2–. EDT not only helps to reduce the aggregation and thus enhance the linearization of the PEDOT chains but also changes the molecular conformation of the PEDOT chains from a benzoid to a quinoid structure. EDT-doped PEDOT NF-based CEs showed almost 3.7 times higher conductivity, better electrocatalytic activity, and improved compatibility with S^2–/S_n^2– in an aqueous electrolyte. As a result, the charge transfer resistance between the polymer-based CE and the S^2–/S_n^2– electrolyte was significantly reduced, resulting in over 3% ECE in QDSCs, more than double that of a bare PEDOT NF-based CE.