Selenium Heterocyclic Electron Acceptor with Small Urbach Energy for As-Cast High-Performance Organic Solar Cells,Journal of the American Chemical Society

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Selenium Heterocyclic Electron Acceptor with Small Urbach Energy for As-Cast High-Performance Organic Solar Cells
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-10-21 , DOI: 10.1021/jacs.0c08557
Zhenzhen Zhang _{1,

2} , Yawen Li ₁ , Guilong Cai ₃ , Yihang Zhang ₁ , Xinhui Lu ₃ , Yuze Lin ₁

Affiliation

Typical organic photovoltaic materials show high Urbach energies (ca. 25-50 meV), which is considerably higher than those of their inorganic counterparts and limits further improvement in the device efficiency of organic solar cells (OSCs). In this study, we introduce a facile method of selenium substitution to reduce the Urbach energy of organic photovoltaic materials to 20.4 meV (Y6Se), which is the lowest value reported for high-performance organic photovoltaic materials and very close to those (ca. 15 meV) of typical inorganic/hybrid semiconductors, such as crystalline silicon, gallium nitride, and lead-halide perovskite. Next, OSCs based on Y6Se showed 17.7% efficiency, which is among the best results for OSCs and the record efficiency of as-cast single junction OSCs to date.

中文翻译：

用于铸态高性能有机太阳能电池的具有小 Urbach 能量的硒杂环电子受体

典型的有机光伏材料显示出高 Urbach 能量（约 25-50 meV），这远高于其无机对应物的能量，并限制了有机太阳能电池 (OSC) 器件效率的进一步提高。在这项研究中，我们引入了一种简便的硒替代方法，将有机光伏材料的 Urbach 能量降低至 20.4 meV (Y6Se)，这是高性能有机光伏材料报告的最低值，非常接近这些值（约 15 meV）典型的无机/杂化半导体，如晶体硅、氮化镓和卤化铅钙钛矿。接下来，基于 Y6Se 的 OSC 显示出 17.7% 的效率，这是 OSC 的最佳结果之一，也是迄今为止铸态单结 OSC 的创纪录效率。

更新日期：2020-10-21

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