12.5% Flexible Nonfullerene Solar Cells by Passivating the Chemical Interaction Between the Active Layer and Polymer Interfacial Layer,Advanced Materials

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12.5% Flexible Nonfullerene Solar Cells by Passivating the Chemical Interaction Between the Active Layer and Polymer Interfacial Layer
Advanced Materials ( IF 27.4 ) Pub Date : 2019-01-17 , DOI: 10.1002/adma.201806616
Sixing Xiong ₁ , Lin Hu ₁ , Lu Hu ₁ , Lulu Sun ₁ , Fei Qin ₁ , Xianjie Liu ₂ , Mats Fahlman ₂ , Yinhua Zhou ₁

Affiliation

Nonfullerene (NF) organic solar cells (OSCs) have been attracting significant attention in the past several years. It is still challenging to achieve high‐performance flexible NF OSCs. NF acceptors are chemically reactive and tend to react with the low‐temperature‐processed low‐work‐function (low‐WF) interfacial layers, such as polyethylenimine ethoxylated (PEIE), which leads to the “S” shape in the current‐density characteristics of the cells. In this work, the chemical interaction between the NF active layer and the polymer interfacial layer of PEIE is deactivated by increasing its protonation. The PEIE processed from aqueous solution shows more protonated N⁺ than that processed from isopropyl alcohol solution, observed from X‐ray photoelectron spectroscopy. NF solar cells (active layer: PCE‐10:IEICO‐4F) with the protonated PEIE interfacial layer show an efficiency of 13.2%, which is higher than the reference cells with a ZnO interlayer (12.6%). More importantly, the protonated PEIE interfacial layer processed from aqueous solution does not require a further thermal annealing treatment (only processing at room temperature). The room‐temperature processing and effective WF reduction enable the demonstration of high‐performance (12.5%) flexible NF OSCs.

中文翻译：

通过钝化活性层和聚合物界面层之间的化学相互作用，实现12.5％的柔性非富勒烯太阳能电池

在过去的几年中，非富勒烯（NF）有机太阳能电池（OSC）引起了极大的关注。实现高性能，灵活的NF OSC仍然具有挑战性。NF受体具有化学反应性，并且倾向于与低温加工的低功函数（low-WF）界面层（例如聚乙烯亚胺乙氧基化（PEIE））反应，从而导致电流密度为“ S”形细胞的特征。在这项工作中，PEIE的NF活性层和聚合物界面层之间的化学相互作用通过增加质子化作用而失活。由水溶液处理的PEIE显示出更多的质子化N ⁺用X射线光电子能谱观察到的结果要比用异丙醇溶液处理的结果要大。具有质子化PEIE界面层的NF太阳能电池（活性层：PCE-10：IEICO-4F）显示出13.2％的效率，高于具有ZnO中间层的参比电池（12.6％）。更重要的是，由水溶液处理的质子化的PEIE界面层不需要进一步的热退火处理（仅在室温下处理）。室温处理和有效的WF降低使得可以演示高性能（12.5％）的灵活NF OSC。

更新日期：2019-01-17

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