Overcoming efficiency and stability limits in water-processing nanoparticular organic photovoltaics by minimizing microstructure defects
Overcoming efficiency and stability limits in water-processing nanoparticular organic photovoltaics by minimizing microstructure defects
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DOI：
10.1038/s41467-018-07807-5
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发表时间：
2018-12
影响因子：
16.6
通讯作者：
Chen Xie;Thomas Heumüller;W. Gruber;Xiaofeng Tang;Andrej Classen;Isabel Schuldes;Matthew Bidwell;A. Späth;R. Fink;T. Unruh;I. McCulloch;Ning Li;C. Brabec
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文献类型：
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作者：
Chen Xie;Thomas Heumüller;W. Gruber;Xiaofeng Tang;Andrej Classen;Isabel Schuldes;Matthew Bidwell;A. Späth;R. Fink;T. Unruh;I. McCulloch;Ning Li;C. Brabec
从环境友好的溶剂中加工有机光伏有着强烈的市场驱动需求。水分散有机半导体纳米粒子(NPs)令人信服地满足了这些前提。然而，表面活性剂的必要性是实现水处理设备具有竞争力的电力转换效率的主要障碍，而表面活性剂对于稳定NPs是不可避免的。在这里，我们报告了一种将表面活性剂对太阳能电池性能的不利影响降至最低的概念。泊洛沙姆通过从水分散体中剥离多余的表面活性剂，促进了有机半导体纳米粒的纯化。基于聚(3-己基噻吩基)/非富勒烯受体的表面活性剂剥离纳米粒子的使用导致了与卤化溶剂处理的器件相比的器件效率和稳定性。基于低带隙聚合物系统的NP器件获得了7.5%的记录效率。这种优雅的方法开辟了一条途径，即未来的有机光伏处理可能确实基于无毒的水性纳米颗粒墨水。
There is a strong market driven need for processing organic photovoltaics from eco-friendly solvents. Water-dispersed organic semiconducting nanoparticles (NPs) satisfy these premises convincingly. However, the necessity of surfactants, which are inevitable for stabilizing NPs, is a major obstacle towards realizing competitive power conversion efficiencies for water-processed devices. Here, we report on a concept for minimizing the adverse impact of surfactants on solar cell performance. A poloxamer facilitates the purification of organic semiconducting NPs through stripping excess surfactants from aqueous dispersion. The use of surfactant-stripped NPs based on poly(3-hexylthiophene) / non-fullerene acceptor leads to a device efficiency and stability comparable to the one from devices processed by halogenated solvents. A record efficiency of 7.5% is achieved for NP devices based on a low-band gap polymer system. This elegant approach opens an avenue that future organic photovoltaics processing may be indeed based on non-toxic water-based nanoparticle inks.