Effect of the Type and Number of Organic Addends on Fullerene Acceptors for n‐Type Electronic Devices: Redox Properties and Energy Levels
Effect of the Type and Number of Organic Addends on Fullerene Acceptors for n‐Type Electronic Devices: Redox Properties and Energy Levels
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DOI：
10.1002/slct.201800837
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发表时间：
2018-06
期刊：
影响因子：
2.1
通讯作者：
A. Ruff;X. Qian;Kyriakos Porfyrakis;S. Ludwigs
中科院分区：
文献类型：
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作者：
A. Ruff;X. Qian;Kyriakos Porfyrakis;S. Ludwigs
富勒烯仍然是电子应用中性能最好的电子受体材料之一，如有机太阳能电池，有机-无机钙钛矿太阳能电池和晶体管。我们证明，伏安法是一个非常强大的工具，用于确定氧化还原电位，从而LUMO水平的各种富勒烯受体材料时，相同的条件下，即。使用相同的电解质、电极材料和电势标准。所分析的富勒烯衍生物具有几种类型（茚、蒽和1，2-二甲氧基亚甲基）和数量（单、双和三加合物）的加合物。我们的系统研究使单个富勒烯的值直接相关，并发现氧化还原电位和吸附物的数量之间存在线性关系。在体异质结太阳能电池中，双和三加合物的高LUMO能级有利于与聚合物供体组合的高开路电压。仅考虑高LUMO值，IC 60 TA和IC 70 TA是最有前途的有机太阳能电池材料，显示出高VOC。富勒烯的双加合物显示LUMO能级与钙钛矿太阳能电池中广泛使用的有机金属三卤化物CH 3 NH3 PbI的能级密切匹配。
Fullerenes are still among the best performing electron acceptor materials for electronic applications such as organic solar cells, organic‐inorganic perovskite solar cells and transistors. We demonstrate that voltammetry is a very powerful tool for the determination of the redox potentials and thus the LUMO levels of various fullerene acceptor materials when identical conditions, i. e. same electrolyte, electrode material and potential standard, are used. The analyzed fullerene derivatives bear several types (indene, anthracene and 1,2‐dimethoxymethano groups)andnumbers (mono‐, bis‐ and tris‐adducts) of addends. Our systematical study enables a direct correlation of the values obtained for the individual fullerenes, and a linear relationship of the redox potential and the number of addends was found. The high lying LUMO levels of the bis‐ and tris‐adducts are favorable in terms of a high open circuit voltage in combination with polymer donors in bulk heterojunction solar cells. Considering only high LUMO values IC60TA and IC70TA are the most promising materials for organic solar cells revealing a highVOC. The bis‐adducts of the fullerenes reveal LUMO levels that closely match the energy level of the widely used organometal trihalide CH3NH3PbI in perovskite solar cells.