Charge transfer state characterization and voltage losses of organic solar cells
Charge transfer state characterization and voltage losses of organic solar cells
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DOI：
10.1088/2515-7639/ac44d9
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发表时间：
2022-04-01
影响因子：
4.8
通讯作者：
Riede, Moritz
中科院分区：
文献类型：
--
作者：
Jungbluth, Anna;Kaienburg, Pascal;Riede, Moritz
正确测定电压损失对于开发性能更好的有机太阳能电池（OSC）至关重要。这需要深入了解界面电荷转移（CT）状态的性质，它不仅为系统的开路电压设定上限，而且还控制辐射和非辐射复合过程。在过去的十年中，已经出现了不同的方法来对OSC中的电压损耗进行分类，这些方法依赖于通用的详细平衡方法或另外包括特定于OSC的CT状态参数。在后一种情况下，正确确定CT状态属性是至关重要的。在这项工作中，我们总结了今天使用的不同框架来计算电压损耗，并提供了一个深入的讨论，目前最重要的模型，用于表征CT状态属性的吸收和发射数据的有机薄膜和太阳能电池。我们还解决了数据记录，分析和拟合过程中的实际问题。从经典的两态马库斯理论的方法出发，我们讨论了量子化的分子振动和充满活力的杂化效应在有机供体-受体系统的重要性，其目标是为读者提供一个详细的了解，当每个模型是最合适的。
A correct determination of voltage losses is crucial for the development of organic solar cells (OSCs) with improved performance. This requires an in-depth understanding of the properties of interfacial charge transfer (CT) states, which not only set the upper limit for the open-circuit voltage of a system, but also govern radiative and non-radiative recombination processes. Over the last decade, different approaches have emerged to classify voltage losses in OSCs that rely on a generic detailed balance approach or additionally include CT state parameters that are specific to OSCs. In the latter case, a correct determination of CT state properties is paramount. In this work, we summarize the different frameworks used today to calculate voltage losses and provide an in-depth discussion of the currently most important models used to characterize CT state properties from absorption and emission data of organic thin films and solar cells. We also address practical concerns during the data recording, analysis, and fitting process. Departing from the classical two-state Marcus theory approach, we discuss the importance of quantized molecular vibrations and energetic hybridization effects in organic donor-acceptor systems with the goal to providing the reader with a detailed understanding of when each model is most appropriate.