Investigation of the property change of polymer solar cells by changing counter anions in polyviologen as a cathode buffer layer

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• 作者：Thu Trang Do (1)
  Hee Seob Hong (1)
  Ye Eun Ha (1)
  Chan-Young Park (1)
  Joo Hyun Kim (1)
  
  1. Department of Polymer Engineering ; Pukyong National University ; Busan ; 608-739 ; Korea
  
• 关键词：polyviologen ; buffer layer ; anion exchange ; polymer solar cell ; interface dipole
• 刊名：Macromolecular Research
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：23
• 期：2
• 页码：177-182
• 全文大小：535 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Polymer Sciences
  Characterization and Evaluation of Materials
  Soft and Granular Matter, Complex Fluids and Microfluidics
  Nanochemistry
  Nanotec
  
• 出版者：The Polymer Society of Korea, co-published with Springer
• ISSN：2092-7673

文摘

Polyviologen (PV) derivatives are known as materials for lowering the work function of cathodes, thereby reducing the electron injection/collection barrier at the cathode interface of polymer solar cells (PSCs). In order to demonstrate the effect of the size of counter anions in PV derivative on the photovolatic properties, we introduce different types of counter anions such as bromide (Br), hexafluorophosphate (PF6), and p-toluene sulfonate (OTs), in PV derivative. The effective work function of the Al electrode is gradually increased by increasing the size of counter anion, indicating the larger counter anion leads to the larger reduction of a Schottky barrier. The power conversion efficiency (PCE) value of the devices is also improved by increasing the size of counter anion. The device (ITO/ PEDOT/P3HT:PCBM/PV/Al) with the thin layer of PV derivative bearing a counter anion of OTs as a cathode buffer layer demonstrates the PCE of 3.90%, with a open circuit voltage (Voc) of 0.64 V, a short circuit current density (Jsc) of 11.39 mA/cm2, and a fill factor (FF) of 53.5%, respectively. This is better than the device with PV derivative having a counter anion of PF6 (PCE=3.73%, Jsc=11.14 mA/cm2, Voc=0.64 V, FF=52.1%) or Br (PCE=3.62%, Jsc=10.95 mA/cm2, Voc=0.64 V, FF=51.6%). Here, our results show that it is possible to improve the performance of PSCs and to tune the electron injection/collection barrier height at the cathode interface by choosing different counter anions without complicated synthesis.