温度依赖的电荷转移态吸收和发射揭示了动力学无序在有机太阳能电池中的主导作用
Temperature dependent charge transfer state absorption and emission reveal dominant role of dynamic disorder in organic solar cells
摘要：
在有机光电子器件中，给电子区和受电子区界面上的电荷转移态的能量分布对器件的性能至关重要。中心问题--如静态能量紊乱和振动效应的作用--正在进行争论。这项研究提供了一个深入的分析温度依赖性的扩大的光谱吸收和发射特性的CT状态的小分子富勒烯共混物的设备。我们确认光电外量子效率（$\mathrm{EQE_{PV}}$）和电致发光（$\mathrm{EQE_{EL}}$）之间的电光互易关系的有效性，使我们能够验证在实验过程中的设备温度。经验证的温度使我们能够用几种模型拟合我们的实验数据，并将提取的CT状态能量与$0\mathrm{\,K}$处的相应开路电压限值进行比较。我们的研究结果揭示了吸收和发射特性通常是不对称的，并且由温度激活的加宽（振动）效应而不是静态无序主导。
英文摘要：
The energetic landscape of charge transfer (CT) states at the interface of electron donating and electron accepting domains in organic optoelectronic devices is crucial for their performance. Central questions -- such as the role of static energetic disorder and vibrational effects -- are under ongoing dispute. This study provides an in-depth analysis of temperature dependent broadening of the spectroscopic absorption and emission features of CT states in devices with small molecule-fullerene blends. We confirm the validity of the electro-optical reciprocity relation between the photovoltaic external quantum efficiency ($\mathrm{EQE_{PV}}$) and electroluminescence ($\mathrm{EQE_{EL}}$), enabling us to validate the device temperature during the experiment. The validated temperature allows us to fit our experimental data with several models, and compare extracted CT state energies with the corresponding open circuit voltage limit at $0\mathrm{\,K}$. Our findings unveil that the absorption and emission characteristics are usually not symmetric, and dominated by temperature-activated broadening (vibrational) effects instead of static disorder.
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