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首页> 外文期刊>Advanced Functional Materials >Chemically Controlled Reversible and Irreversible Extraction Barriers Via Stable Interface Modification of Zinc Oxide Electron Collection Layer in Polycarbazole-based Organic Solar Cells
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Chemically Controlled Reversible and Irreversible Extraction Barriers Via Stable Interface Modification of Zinc Oxide Electron Collection Layer in Polycarbazole-based Organic Solar Cells

机译：化学控制的可逆和不可逆萃取壁垒，通过基于聚咔唑的有机太阳能电池中氧化锌电子收集层的稳定界面改性

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摘要

A spin-cast method is presented for the formation of phosphonic acid func-tionalized small molecule layers on solution-processed ZnO substrates for use as electron collecting interlayers in organic photovoltaics. Phosphonic acid interlayers modify the ZnO work function and the charge carrier injection barrier at its interface, resulting in systematic control of V_(OC) in inverted bulk heterojunction solar cells. Surface modification is shown to moderate the need for UV light-soaking of the ZnO contact layers. Lifetime studies (30 days) indicate stable and improved OPV performance over the unmodified ZnO contact, which show significant increases in charge extraction barriers and series resistance. Results suggest that enhanced stability using small molecule modifiers is due to partial passivation of the oxide surface to molecular oxygen adsorption. Surface passivation while maintaining work function control of a selective interlayer can be employed to improve net efficiency and lifetime of organic photovoltaic devices. The modified cathode work function modulates V_(OC) via static energetic barriers and modulates contact conductivity by creating reversible and irreversible S-shape current-voltage characteristics as a result of kinetic barriers to charge transport.
机译：提出了一种旋涂法，用于在溶液处理的ZnO基板上形成膦酸功能化的小分子层，以用作有机光伏中的电子收集中间层。膦酸夹层修改了ZnO功函数和其界面处的电荷载流子注入势垒，从而导致对反向大体积异质结太阳能电池中V_（OC）的系统控制。已经表明，表面改性可以缓和ZnO接触层的UV浸泡的需求。终生研究（30天）表明，与未经修饰的ZnO接触相比，OPV性能稳定且有所改善，这表明电荷提取壁垒和串联电阻显着增加。结果表明，使用小分子改性剂增强的稳定性是由于氧化物表面对分子氧吸附的部分钝化。可以在保持选择性中间层的功函数控制的同时进行表面钝化以提高有机光伏器件的净效率和寿命。改进的阴极功函数通过静态高能垒来调制V_（OC），并通过形成动态的势垒来实现电荷传输，从而通过创建可逆和不可逆的S形电流-电压特性来调制接触电导率。

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  • 来源
    《Advanced Functional Materials》 |2014年第29期|4671-4680|共10页
  • 作者

    Sarah R. Cowan; Philip Schulz; Anthony J. Giordano; Andres Garcia; Bradley A. MacLeod; Seth R. Marder; Antoine Kahn; David S. Ginley; Erin L. Ratcliff; Dana C. Olson;

  • 作者单位

    National Center tor Photovoltaics National Renewable Energy Laboratory Golden, CO 80401, USA;

    Department of Electrical Engineering Princeton University Princeton, NJ 08544, USA;

    School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics Georgia Institute of Technology Atlanta, GA 30332-0400, USA;

    National Center tor Photovoltaics National Renewable Energy Laboratory Golden, CO 80401, USA;

    National Center tor Photovoltaics National Renewable Energy Laboratory Golden, CO 80401, USA;

    School of Chemistry and Biochemistry and Center for Organic Photonics and Electronics Georgia Institute of Technology Atlanta, GA 30332-0400, USA;

    Department of Electrical Engineering Princeton University Princeton, NJ 08544, USA;

    National Center tor Photovoltaics National Renewable Energy Laboratory Golden, CO 80401, USA;

    Department of Chemistry University of Arizona Tucson, AZ 85721, USA;

    National Center tor Photovoltaics National Renewable Energy Laboratory Golden, CO 80401, USA;

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