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首页> 外文期刊>ACS applied materials & interfaces >Low Work Function Lacunary Polyoxometalates as Electron Transport Interlayers for Inverted Polymer Solar Cells of Improved Efficiency and Stability
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Low Work Function Lacunary Polyoxometalates as Electron Transport Interlayers for Inverted Polymer Solar Cells of Improved Efficiency and Stability

机译：低功函数花瓣多毒液作为电子传输中间层，用于倒聚合物太阳能电池的提高效率和稳定性

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Effective interface engineering has been shown to play a vital role in facilitating efficient charge-carrier transport, thus boosting the performance of organic photovoltaic devices. Herein, we employ water-soluble lacunary polyoxometalates (POMs) as multifunctional interlayers between the titanium dioxide (TiO2) electron extraction/transport layer and the organic photoactive film to simultaneously enhance the efficiency, lifetime, and photo stability of polymer solar cells (PSCs). A significant reduction in the work function (WF) of TiO2 upon POM utilization was observed, with the magnitude being controlled by the negative charge of the anion and the selection of the addenda atom (W or Mo). By inserting a POM interlayer with similar to 40 nm thickness into the device structure, a significant improvement in the power conversion efficiency was obtained; the optimized POM-modified poly[[4,8-bis [(2-ethylhexyl) oxy] benzo [1,2-b :4,5-b'] dithiophene-2,6-diyl] [3-fluoro-2-[(2-33 ethylhexyl) carb onyl] thieno [3,4-b] thiophenediylp [6,6]-phenyl-C-70 butyric acid methyl ester (PTB7:PC70BM)-based PSCs exhibited an efficiency of 8.07%, which represents a 21% efficiency enhancement compared to the reference TiO2 cell. Similar results were obtained in POM-modified devices based on poly(3-hexylthiophene) (P3HT) with electron acceptors of different energy levels, such as PC70BM or indene-C-60 bisadduct (IC(60)BA), which enhanced their efficiency up to 4.34 and 6.21%, respectively, when using POM interlayers; this represents a 25-33% improvement as compared to the reference cells. Moreover, increased lifetime under ambient air and improved photostability under constant illumination were observed in POM-modified devices. Detailed analysis shows that the improvements in efficiency and stability synergistically stem from the reduced work function of TiO2 upon POM coverage, the improved nanomorphology of the photoactive blend, the reduced interfacial recombination losses, the superior electron transfer, and the more effective exciton dissociation at the photoactive layer/POM/TiO2 interfaces.
机译：已经显示有效的界面工程在促进有效的电荷载波运输方面发挥着重要作用，从而提高了有机光伏器件的性能。在此，我们在二氧化钛（TiO 2）电子提取/传输层和有机光活性膜之间使用水溶性的拉丝聚氧酸盐（POMS）作为多功能中间层，以同时增强聚合物太阳能电池（PSC）的效率，寿命和光稳定性。观察到POM利用率的TiO2功函数（WF）的显着降低，其幅度由阴离子的​​负电荷和编辑原子（W或Mo）的选择来控制。通过将具有类似于40nm厚度的POM中间层插入器件结构中，获得了功率转换效率的显着改善;优化的POM改性聚合物[[4,8-双[（2-乙基己基）氧]苯并[1,2-B：4,5-B']二噻吩-2,6-二基] [3-氟-2 - [（2-33乙基己基）CARB ONEL] Thieno [3,4-B]噻吩（3,6] - 苯基-C-70丁酸甲酯（PTB7：PC70BM）的PSC表现出8.07％的效率，与参考TiO2细胞相比，这表示21％的效率增强。基于聚（3-己基噻吩）（P3HT）的POM改性装置中获得了类似的结果，其中电子受体的不同能量水平，例如PC70BM或茚 - C-60 Bisadduct（IC（60）BA），这提高了它们的效率使用POM中间层，分别高达4.34和6.21％;与参考电池相比，这占25-33％的改善。此外，在POM改性装置中观察到在环境空气下的寿命增加，并在恒定照射下的改善的光稳定性。详细分析表明，效率和稳定性的提高协同源于TiO2在POM覆盖时的工作功能，改善的光活性混合物的纳米形态，降低的界面重组损失，高级电子转移以及更有效的激子解离光活性层/ POM / TiO2接口。

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