Two-Dimensional Bi2O2Se with High Mobility for High-Performance Polymer Solar Cells.,ACS Applied Materials & Interfaces

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Two-Dimensional Bi2O2Se with High Mobility for High-Performance Polymer Solar Cells.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-04-17 , DOI: 10.1021/acsami.0c01364
Chengwen Huang ₁ , Huangzhong Yu _{1,

2,

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Affiliation

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.

中文翻译：

具有高迁移率的二维Bi2O2Se，用于高性能聚合物太阳能电池。

载流子迁移率是影响聚合物太阳能电池（PSC）功率转换效率（PCE）的关键因素，而低电荷载流子迁移率仍然限制了PSC的性能改进。在活性层中添加高迁移率材料是增强PSC的PCE的较好方法之一。二维（2D）Bi2O2Se由于具有超高的迁移率和高的热稳定性，因此可以作为提高PSC载流子迁移率的理想添加剂。在这项工作中，Bi2O2Se几层二维纳米片是通过将锂嵌入与剪切力辅助液相剥离相结合而制成的，并首次用作添加剂来促进PSC中的电荷传输。当将二维Bi2O2Se纳米薄片引入有源层时，不仅在供体和受体之间提供了新的界面和有效的电荷转移途径，而且还引发了光敏层的结晶并形成了连续的互穿网络，从而促进了激子在光敏层中的分离和电荷转移。结果，基于PBDB-T / ITIC的设备的PCE从10.09％（0 wt％）增加到12.22％（2 wt％）。同时，基于PM6 / Y6的设备的PCE也从二进制设备的14.59％增加到优化的三元设备（2 wt％）的16.28％。而且，优化的三元装置通过抑制两相的混合而表现出优异的空气稳定性。这项工作为增强PSC的PCE提供了一种很好的方法，并且表明Bi2O2Se材料在光伏器件中具有良好的前景。

更新日期：2020-04-23

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