Two-Dimensional Bi2O2Se with High Mobility for High-Performance Polymer Solar Cells
Two-Dimensional Bi2O2Se with High Mobility for High-Performance Polymer Solar Cells
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DOI：
10.1021/acsami.0c01364
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发表时间：
2020-04-29
影响因子：
9.5
通讯作者：
Yu, Huangzhong
中科院分区：
文献类型：
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作者：
Huang, Chengwen;Yu, Huangzhong
载流子迁移率是影响聚合物太阳能电池功率转换效率（PCE）的关键因素，低载流子迁移率仍然制约着聚合物太阳能电池性能的提高。在有源层中加入高迁移率材料是提高PSCs PCE的较好方法之一。二维（2D） Bi2O2Se具有超高迁移率和高热稳定性，是提高psc载流子迁移率的理想添加剂材料。本文将锂嵌入与剪切力辅助液相剥离相结合，制备了Bi2O2Se少层二维纳米薄片，并首次将其作为添加剂应用于PSCs中促进电荷输运。将二维Bi2O2Se纳米片引入到活性层中，不仅提供了一个新的供体和受体之间的界面和有效的电荷转移途径，而且还诱导了光敏层的结晶并形成连续的互穿网络，促进了光敏层中的激子分离和电荷转移。因此，基于PBDB-T/ITIC的器件的PCE从10.09% （0 wt %）增加到12.22% （2 wt %）。同时，基于PM6/Y6的器件的PCE也从二进制器件的14.59%提高到优化后的三元器件的16.28% （2 wt %）。此外，优化后的三元装置通过抑制两相的混合表现出良好的空气稳定性。本研究为提高PSCs的PCE提供了一种很好的方法，也表明Bi2O2Se材料在光伏器件中具有良好的应用前景。
Carrier mobility is a critical factor for power conversion efficiency (PCE) of polymer solar cells (PSCs), and the low charge carrier mobility still limits the performance improvement of PSCs. Adding high-mobility material into the active layer is one of the better ways to enhance the PCE of PSCs. Two-dimensional (2D) Bi2O2Se can be an ideal additive material for improving the carrier mobility of PSCs because of its ultrahigh mobility and high thermal stability. In this work, the Bi2O2Se few-layer 2D nanoflakes are fabricated by combining lithium intercalation with shear force-assisted liquid phase exfoliation and applied as an additive to promote charge transport in PSCs for the first time. The 2D Bi2O2Se nanoflakes, when introduced into the active layer, not only provide a new interface between a donor and an acceptor and efficient charge transfer pathways but also induce crystallization of the photosensitive layer and form continuous interpenetrating networks, which promotes the exciton separation and charge transfer in the photosensitive layer. As a result, the PCE of a device based on PBDB-T/ITIC is increased from 10.09% (0 wt %) to 12.22% (2 wt %). Meanwhile, the PCE of a device based on PM6/Y6 is also increased from 14.59% for a binary device to 16.28% for an optimized ternary device (2 wt %). Moreover, the optimized ternary device shows excellent air stability by suppressing the mixing of the two phases. This work provides a good method to enhance the PCE of PSCs and also shows that the Bi2O2Se material has a good prospect in photovoltaic devices.