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首页> 外文期刊>Advanced Materials >Donor Polymer Can Assist Electron Transport in Bulk Heterojunotion Blends with Small Energetic Offsets
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Donor Polymer Can Assist Electron Transport in Bulk Heterojunotion Blends with Small Energetic Offsets

机译：施主聚合物可以协助电子传输大体积能量偏移的本体异质结共混物中。

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摘要

Conventional organic solar cell (OSC) systems have significant energy offsets between the donor and acceptor both at the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels. Because of this, in a bulk heterojunction (BHJ) system, electrons typically transport in acceptors, whereas holes typically transport in donors. It is not favorable for electrons to hop back and forth between the donor and acceptor because the hopping is energetically disfavored. In such conventional OSC systems, the addition of donor polymer to acceptor films should typically reduce the electron mobility. In this study, a surprisingly large increase (up to 30x) in electron mobility is observed in an OSC blend when introducing a polymer donor into small molecular acceptor. By ruling out morphology reasons, it is shown that the donor polymer can assist the electron transport by providing "bridges" or a "shortcut" for electron transport across the domains of small molecular acceptors. This can happen because, for these systems, the LUMO offset is small. The study shows the benefits of donor-assisted electron transport in BHJ systems with small energetic offsets. This finding could be also applied to other fields to tune the optimized charge transport property of organic materials or slush blends.
机译：常规的有机太阳能电池（OSC）系统在最高占据分子轨道（HOMO）和最低未占据分子轨道（LUMO）能量水平下都在施主和受主之间具有明显的能量偏移。因此，在体异质结（BHJ）系统中，电子通常在受主中传输，而空穴通常在施主中传输。电子在供体和受体之间来回跳动是不利的，因为这种跳动在能量上是不利的。在这样的常规OSC系统中，将施主聚合物添加到受体膜通常应降低电子迁移率。在这项研究中，将聚合物供体引入小分子受体时，在OSC共混物中观察到电子迁移率出乎意料的大幅度提高（最高30倍）。通过排除形态学原因，表明供体聚合物可以通过提供跨小分子受体域的电子传输的“桥”或“捷径”来辅助电子传输。发生这种情况的原因是，对于这些系统，LUMO偏移很小。研究表明，在能量偏移较小的BHJ系统中，施主辅助电子传输的好处。这一发现还可以应用于其他领域，以调节有机材料或搪塑混合物的最佳电荷传输性能。

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