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Contact Doping with Sub-Monolayers of Strong Polyelectrolytes for Organic Photovoltaics

机译：用于有机光伏的强单电解质亚单层接触掺杂

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摘要

Barriers to charge transfer at electrode-semiconductor contacts are ubiquitous and limit the applicability of organic semiconductors in electronic devices. Molecular or ionic doping near contacts can alleviate charge injection or extraction problems by enabling charge tunneling through contact barriers, but the soft nature of organic materials allows for small molecule dopants to diffuse and migrate, degrading the performance of the device and limiting effective interfacial doping. Here, it is demonstrated that contact doping in organic electronics is possible through ionic polymer dopants, which resist diffusion or migration due to their large size. Sub-monolayer deposition of non-conjugated strong polyelectrolytes, e.g., sulfonated poly(sulfone)s, at the anode-semiconductor interface of organic photovoltaics enables efficient hole extraction at the anode. The performance of contact-doped organic photo­voltaics nearly matches the performance of devices composed of traditional hole transport layers such as poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). The degree of sulfonation of the dopant polymer and the thickness of the ionic dopant layer is shown to be critical for optimizing doping and the efficiency of the device.
机译：电极-半导体接触处电荷转移的障碍无处不在，并限制了有机半导体在电子设备中的适用性。接触附近的分子或离子掺杂可通过使电荷隧穿通过接触势垒来缓解电荷注入或提取问题，但是有机材料的柔软性质允许小分子掺杂剂扩散和迁移，从而降低了器件的性能并限制了有效的界面掺杂。在此证明，有机电子器件中的接触掺杂可以通过离子聚合物掺杂剂实现，该离子聚合物掺杂剂由于其大尺寸而不会扩散或迁移。在有机光伏电池的阳极-半导体界面处非共轭强聚合电解质（如磺化聚砜）的亚单层沉积能够在阳极处有效地进行空穴提取。接触掺杂的有机光伏电池的性能几乎与由传统的空穴传输层（例如聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS））组成的器件的性能相匹配。已显示出掺杂剂聚合物的磺化程度和离子掺杂剂层的厚度对于优化掺杂和器件效率至关重要。

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  • 来源
    《Advanced energy materials》 |2014年第13期|1-6|共6页
  • 作者

    Gopal K. Mor; David Jones; Thinh P. Le; Zhengrong Shang; Patrick J. Weathers; Megumi K. B. Woltermann; Kiarash Vakhshouri; Bryan P. Williams; Sarah A. Tohran; Tomonori Saito; Rafael Verduzco; Alberto Salleo; Michael A. Hickner; Enrique D. Gomez;

  • 作者单位

    Department of Chemical Engineering The Pennsylvania State University PA USA;

    Department of Materials Science and Engineering The Pennsylvania State University PA USA;

    Department of Chemical Engineering The Pennsylvania State University PA USA;

    Department of Materials Science and Engineering Stanford University Stanford CA USA;

    Department of Chemical Engineering The Pennsylvania State University PA USA;

    Department of Chemical Engineering The Pennsylvania State University PA USA;

    Department of Chemical Engineering The Pennsylvania State University PA USA;

    Department of Chemical Engineering The Pennsylvania State University PA USA;

    Department of Chemical Engineering The Pennsylvania State University PA USA;

    Department of Materials Science and Engineering The Pennsylvania State University PA USA;

    Department of Chemical and Biomolecular Engineering Rice University Houston TX USA;

    Department of Materials Science and Engineering Stanford University Stanford CA USA;

    Department of Materials Science and Engineering The Pennsylvania State University PA USA;

    Department of Chemical Engineering The Pennsylvania State University PA USA;

    Materials Research Institute The Pennsylvania State University PA USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    organic solar cells; electrode-semiconductor interfaces; ionomers; polyelectrolytes; organic electronics;

    机译：有机太阳能电池;电极-半导体界面;离聚物;聚电解质;有机电子学;

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