Cumulative gain in organic solar cells by using multiple optical nanopatterns
Cumulative gain in organic solar cells by using multiple optical nanopatterns
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DOI：
10.1039/c7ta01897e
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发表时间：
2017-06-07
影响因子：
11.9
通讯作者：
Tajima, Keisuke
中科院分区：
文献类型：
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作者：
Heo, Soo Won;Le, Thu Hac Huong;Tajima, Keisuke
利用纳米结构进行光波操控是提高有机光致变色材料（OPV）中薄光活性层光吸收的一种有效方法。在这里，我们提出了一种在室温下使用软压印光刻在体异质结（BHJ）OPV中纳米图案化多个界面的方法。OPV中的界面分别在前ZnO层和后金属电极中用光栅图案进行修饰。每个纳米图案都将OPV的光吸收和功率转换效率提高了32.5%，具体取决于材料。此外，在正面和背面的纳米图案累积增加了光吸收，导致最高效率增加38.5%。在含有聚合物PTB7、PCE 10、P3HT或PNTz4T的具有不同性质的各种BHJ系统中观察到增加。PNTz4T：PC71BM系统在纳米粒子存在下实现了10.31%的认证性能。通过吸收光谱和光学模拟的详细分析表明，来自正面和背面的纳米片的光学增益的来源是不同的。正面图案增加透射率，背面图案增加散射并激发表面等离子体激元。
Light wave manipulation by using nanostructures is a promising strategy for enhancing the light absorption of thin photoactive layers in organic photovoltaics (OPVs). Here, we propose a method for nanopatterning the multiple interfaces in bulk heterojunction (BHJ) OPVs by using soft imprint lithography at room temperature. The interfaces in the OPVs were separately modified in the front ZnO layers and the back metal electrodes with a grating pattern. Each nanopattern increased the light absorption and the power conversion efficiency of the OPVs by up to 32.5% depending on the materials. Moreover, the nanopatterning at both the front and the back cumulatively increased the light absorption, resulting in the highest efficiency increase of 38.5%. The increases were observed in various BHJ systems with different properties containing the polymers PTB7, PCE10, P3HT, or PNTz4T. A certified performance of 10.31% was achieved for the PNTz4T:PC71BM system in the presence of the nanopatterns. Detailed analysis by using the absorption spectra and optical simulations indicated that the origins of the optical gains from the nanopatterns on the front and the back are different. The front pattern increases the transmittance and the back pattern increases the scattering and excites the surface plasmon polaritons.