Optical Gaps of Organic Solar Cells as a Reference for Comparing Voltage Losses
Optical Gaps of Organic Solar Cells as a Reference for Comparing Voltage Losses
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DOI：
10.1002/aenm.201801352
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发表时间：
2018-08
影响因子：
27.8
通讯作者：
Yuming Wang;Deping Qian;Yong Cui;Huotian Zhang;Jianhui Hou;K. Vandewal;T. Kirchartz;F. Gao
中科院分区：
文献类型：
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作者：
Yuming Wang;Deping Qian;Yong Cui;Huotian Zhang;Jianhui Hou;K. Vandewal;T. Kirchartz;F. Gao
由光学带隙（Eg）和开路电压（VOC）之间的差确定的电压损耗是决定有机太阳能电池（OSC）性能的最重要参数之一。然而，用于确定Eg的各种不同方法使得很难公平地比较不同材料系统之间的电压损耗。在本文中，作者讨论和比较各种Eg测定方法，并显示它们如何影响电压损耗的详细计算，以及最大可实现的功率转换效率的预测。本文的目的是使OSC社区能够以一致和合理的方式比较电压损耗。据发现，在最先进的OSC中，强吸收光子的电压损失不小于0.6 V，仍然必须降低以进一步提高效率。
The voltage loss, determined by the difference between the optical gap (Eg) and the open‐circuit voltage (VOC), is one of the most important parameters determining the performance of organic solar cells (OSCs). However, the variety of different methods used to determine Eg makes it hard to fairly compare voltages losses among different material systems. In this paper, the authors discuss and compare various Eg determination methods and show how they affect the detailed calculation of voltage losses, as well as predictions of the maximum achievable power conversion efficiency. The aim of this paper is to make it possible for the OSC community to compare voltage losses in a consistent and reasonable way. It is found that the voltage losses for strongly absorbed photons in state‐of‐the‐art OSCs are not much less than 0.6 V, which still must be decreased to further enhance efficiency.