ITO surface modification for inverted organic photovoltaics

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• 作者：Mingzhang Deng ; Weina Shi ; Chen Zhao ; Bingbing Chen&#8230
• 关键词：organic photovoltaic (OPV) ; indium tin oxide (ITO) ; inverted structure ; surface modification ; work function (WF)
• 刊名：Frontiers of Optoelectronics in China
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：8
• 期：3
• 页码：269-273
• 全文大小：624 KB
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• 作者单位：Mingzhang Deng (1)
  Weina Shi (1)
  Chen Zhao (1)
  Bingbing Chen (1)
  Yan Shen (1)
  
  1. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China
  
• 刊物类别：Engineering
• 刊物主题：Electronic and Computer Engineering
  Electromagnetism, Optics and Lasers
  Biomedical Engineering
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-2767

文摘

The work function (WF) of indium-tin-oxide (ITO) substrates plays an important role on the inverted organic photovoltaic device performance. And electrode engineering has been a useful method to facilitate carrier extraction or charge collection to enhance organic photovoltaic (OPV) performance. By using self-assembly technique, we have deposited poly(dimethyl diallylammonium chloride) (PDDA) layers onto ITO coated glass substrates. The results indicate that the surface WF of ITO is reduced by about 0.3 eV after PDDA modification, which is attributed to the modulation in electron affinity. In addition, the surface roughness of ITO substrate became smaller after PDDA modification. These modified ITO substrates can be applied to fabricate inverted OPVs, in which ITO works as the cathode to collect electrons. As a result, the photovoltaic performance of inverted OPV is substantially improved, mainly reflecting on the increase of short circuit current density. Keywords organic photovoltaic (OPV) indium tin oxide (ITO) inverted structure surface modification work function (WF)