Lithium-Ion-Based Conjugated Polyelectrolyte as an Interface Material for Efficient and Stable Non-Fullerene Organic Solar Cells
Lithium-Ion-Based Conjugated Polyelectrolyte as an Interface Material for Efficient and Stable Non-Fullerene Organic Solar Cells
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锂离子共轭聚电解质作为高效稳定非富勒烯有机太阳能电池的界面材料
DOI：
10.1002/cssc.201802939
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发表时间：
2019-04-05
期刊：
影响因子：
8.4
通讯作者：
Tu, Guoli
中科院分区：
文献类型：
--
作者：
Li, Junli;Liu, Jikang;Tu, Guoli
合成了一种环境友好的n型水/醇可溶性共轭双金属氧化物PFEOSO 3Li，并将其用作有机太阳能电池的阴极界面层。离域的聚芴主链与疏水活性层有着紧密的联系，而带有锂离子的侧链则可以通过共轭聚电解质的自组装性质向ZnO层移动。紫外光电子能谱分析表明，PFEOSO 3Li的修饰显著降低了ITO/ZnO的功函数，并可能在ZnO和活性层之间形成强的界面偶极子。同时，锂离子作为旁观阳离子的引入可能有助于减少ZnO的本征表面缺陷。经PFEOSO 3 Li修饰后，ZnO的光致发光谱中的绿色发射消失。此外，ZnO的粗糙度几乎没有改变后，与PFEOSO 3Li涂层，表面变得更加疏水，这表明，薄的共轭双金属层表现出良好的附着力与ZnO和活性层。这些现象表明，PFEOSO 3Li的引入使ITO/ZnO成为一种高效的阴极。结果表明，具有ZnO/PFEOSO 3Li双中间层的倒置有机太阳能电池器件对于PBDB-T：IT-M和PBDB-T：ITIC共混体系分别表现出11.7%和10.6%的高效率。
An eco-friendly n-type water/alcohol-soluble conjugated polyelectrolyte PFEOSO3Li was synthesized and applied as a cathode interfacial layer in organic solar cells. The -delocalized polyfluorene backbone has an intimate connection with the hydrophobic active layer, and the side chain with lithium ion may move toward the ZnO layer through the self-assembly property of conjugated polyelectrolytes. UV photoelectron spectroscopy indicated that modification with PFEOSO3Li dramatically lowers the work function of indium-doped tin oxide (ITO)/ZnO and may form strong interfacial dipoles between ZnO and the active layer. Meanwhile, introduction of lithium ions as spectator cations may contribute to reduction of the intrinsic surface defects of ZnO. The green emission in the photoluminescence spectrum of ZnO disappeared after modification with PFEOSO3Li. In addition, the roughness of ZnO barely changed after coating with PFEOSO3Li, and the surface became more hydrophobic, which demonstrates that the thin conjugated polyelectrolyte layer exhibits good adhesion with both ZnO and the active layer. These phenomena indicate that the introduction of PFEOSO3Li makes ITO/ZnO an efficient cathode. As a result, inverted organic solar cell devices with ZnO/PFEOSO3Li double-interlayers exhibit high efficiencies of 11.7 and 10.6% for PBDB-T:IT-M and PBDB-T:ITIC blend systems, respectively.