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首页> 外文期刊>Advanced energy materials >Photogenerated Carrier Mobility Significantly Exceeds Injected Carrier Mobility in Organic Solar Cells
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Photogenerated Carrier Mobility Significantly Exceeds Injected Carrier Mobility in Organic Solar Cells

机译：光生载流子迁移率显着超过有机太阳能电池中注入的载流子迁移率

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摘要

Charge transport in organic photovoltaic (OPV) devices is often characterized by space-charge limited currents (SCLC). However, this technique only probes the transport of charges residing at quasi-equilibrium energies in the disorder-broadened density of states (DOS). In contrast, in an operating OPV device the photogenerated carriers are typically created at higher energies in the DOS, followed by slow thermalization. Here, by ultrafast time-resolved experiments and simulations it is shown that in disordered polymer/fullerene and polymer/polymer OPVs, the mobility of photogenerated carriers significantly exceeds that of injected carriers probed by SCLC. Time-resolved charge transport in a polymer/polymer OPV device is measured with exceptionally high (picosecond) time resolution. The essential physics that SCLC fails to capture is that of photo-generated carrier thermalization, which boosts carrier mobility. It is predicted that only for materials with a sufficiently low energetic disorder, thermalization effects on carrier transport can be neglected. For a typical device thickness of 100 nm, the limiting energetic disorder is sigma approximate to 71 (56) meV for maximum-power point (short-circuit) conditions, depending on the error one is willing to accept. As in typical OPV materials the disorder is usually larger, the results question the validity of the SCLC method to describe operating OPVs.
机译：有机光伏（OPV）设备中的电荷传输通常以空间电荷限制电流（SCLC）为特征。但是，该技术仅探测以无序扩展的状态密度（DOS）驻留在准平衡能量处的电荷的传输。相反，在运行的OPV器件中，通常在DOS中以较高的能量生成光生载流子，然后缓慢加热。在这里，通过超快时间分辨的实验和模拟表明，在无序的聚合物/富勒烯和聚合物/聚合物的OPV中，光生载流子的迁移率大大超过了SCLC探测到的注入载流子的迁移率。聚合物/聚合物OPV器件中的时间分辨电荷传输以极高（皮秒）的时间分辨率进行测量。 SCLC无法捕获的基本物理原理是光生载流子热化，从而提高了载流子迁移率。可以预料，只有对于具有足够低的高能紊乱的材料，可以忽略对载流子传输的热效应。对于典型的100 nm器件厚度，对于最大功率点（短路）条件，极限能量紊乱的sigma约为71（56）meV，这取决于人们愿意接受的误差。由于在典型的OPV材料中，无序通常更大，结果质疑SCLC方法描述运行中的OPV的有效性。

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  • 来源
    《Advanced energy materials》 |2017年第9期|1602143.1-1602143.9|共9页
  • 作者

    Melianas Armantas; Pranculis Vytenis; Xia Yuxin; Felekidis Nikolaos; Inganas Olle; Gulbinas Vidmantas; Kemerink Martijn;

  • 作者单位

    Linkoping Univ, Dept Phys Chem & Biol, Biomol & Organ Elect, S-58183 Linkoping, Sweden;

    Ctr Phys Sci & Technol, Savanoriu Pr 231, LT-02300 Vilnius, Lithuania;

    Linkoping Univ, Dept Phys Chem & Biol, Biomol & Organ Elect, S-58183 Linkoping, Sweden;

    Linkoping Univ, Dept Phys Chem & Biol, Complex Mat & Devices, S-58183 Linkoping, Sweden;

    Linkoping Univ, Dept Phys Chem & Biol, Biomol & Organ Elect, S-58183 Linkoping, Sweden;

    Ctr Phys Sci & Technol, Savanoriu Pr 231, LT-02300 Vilnius, Lithuania;

    Linkoping Univ, Dept Phys Chem & Biol, Complex Mat & Devices, S-58183 Linkoping, Sweden;

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