What's Next for Organic Solar Cells? The Frontiers and Challenges
What's Next for Organic Solar Cells? The Frontiers and Challenges
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DOI：
10.1002/aesr.202200149
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Yasunari Tamai
中科院分区：
文献类型：
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作者：
Yasunari Tamai
近年来，有机太阳能电池（OSC）的功率转换效率（PCE）显著提高，现在单结电池接近>19%，串联电池接近>20%。因此，OSC的实际应用正在成为现实。这种观点总结了OSC特性的最新技术水平，并讨论了进一步改善PCE的挑战。最先进的OSC的短路电流密度（J SC）几乎接近30 mA cm−2。由于这些器件的内部量子效率超过90%，为了进一步提高JSC，有必要抑制界面处的反射并增加有源层厚度以吸收尽可能多的光子。进一步抑制非辐射电压损失是必要的，因为与无机和钙钛矿对应物相比，仍有很大的改进空间。因此，提高非富勒烯受体的激子寿命和光致发光量子产率是提高OSC开路电压的关键。最新的OSC的填充因子接近80%;然而，由于优化的有源层厚度保持在100 nm左右，因此需要进一步抑制双分子电荷复合。最后，这个角度讨论了PCE可以在多大程度上得到改善，以及可以做些什么来实现这一目标。
The power conversion efficiency (PCE) of organic solar cells (OSCs) is improved dramatically in recent years and now approaches >19% for single‐junction cells and >20% for tandem cells. Therefore, the practical use of OSCs is becoming a reality. This perspective summarizes the state of the art of OSC characteristics and discusses the challenges that remain in further improving PCE. The short‐circuit current density (J SC) of the state‐of‐the‐art OSCs almost approaches 30 mA cm−2. As the internal quantum efficiencies of these devices exceed 90%, for further improvement in J SC, it is necessary to suppress reflection at interfaces and increase the active layer thickness to absorb as many photons as possible. Further suppression of the nonradiative voltage loss is imperative, as there is still large room for improvement compared to inorganic and perovskite counterparts. Hence, increasing the exciton lifetime and photoluminescence quantum yield of nonfullerene acceptors are pivotal to improving the open‐circuit voltage of OSCs. The fill factors of the latest OSCs approach 80%; however, because the optimized active layer thickness remains ≈100 nm, further suppression of bimolecular charge recombination is needed. Finally, this perspective discusses to what extent PCE can be improved and what can be done to achieve this.