Traps, which are inevitable in organic solar cells, will result in trap‐assisted recombination, an important loss mechanism that limits device performance. Trap‐filling is an efficient approach to suppress the charge traps, and can improve charge transport and modify the electronic properties. This approach fills the defect states where traps reside by introducing additional carriers, rendering the states electronically inert. Herein, charge carrier dynamics in the prototypical system PCE10/PC₇₁BM with/without doping at different concentrations is directly targeted by employing transient absorption spectroscopy. It is found that the charge carriers' lifetime enhances, and the recombination centers can be filled at high doping concentrations, which is beneficial for achieving high power conversion efficiency. These findings indicate that charge transport and electronic characteristics can be improved by trap‐filling, which is the key to pushing the efficiencies of organic solar cells toward theoretical limits.

中文翻译：

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陷阱填充诱导的有机太阳能电池中的载流子动力学

在有机太阳能电池中不可避免的陷阱会导致陷阱辅助的复合，这是限制器件性能的重要损耗机制。陷阱填充是抑制电荷陷阱的有效方法，可以改善电荷传输并改变电子性能。这种方法通过引入其他载流子来填充陷阱所处的缺陷状态，从而使状态呈电子惰性。在此，原型系统PCE10 / PC ₇₁中的电荷载流子动力学通过采用瞬态吸收光谱法直接靶向具有/不具有不同浓度的掺杂的BM。发现电荷载流子的寿命增加，并且可以在高掺杂浓度下填充重组中心，这对于实现高功率转换效率是有利的。这些发现表明，通过陷阱填充可以改善电荷传输和电子特性，这是将有机太阳能电池的效率推向理论极限的关键。