Liu Hailiang, Hussain Sajjad, Lee Jehoon, Vikraman Dhanasekaran, Kang Jungwon
Department of Electronics and Electrical Engineering, Dankook University, Yongin 16890, Korea.
Institute of Nano and Advanced Materials Engineering, Sejong University, Seoul 05006, Korea.
Materials (Basel). 2021 Jun 10;14(12):3206. doi: 10.3390/ma14123206.
Two-dimensional (2D) tungsten diselenide (WSe) has attracted considerable attention in the field of photovoltaic devices owing to its excellent structure and photoelectric properties, such as ordered 2D network structure, high electrical conductivity, and high mobility. For this test, we firstly prepared different sizes (NS1-NS3) of WSe nanosheets (NSs) through the ultrasonication method and characterized their structures using the field emission scanning electron microscope (FE-SEM), Raman spectroscopy, and X-ray powder diffraction. Moreover, we investigated the photovoltaic performance of polymer solar cells based on 5,7-Bis(2-ethylhexyl)benzo[1,2-c:4,5-c']dithiophene-4,8-dione(PBDB-T):(6,6)-phenyl-C71 butyric acid methyl ester (PCBM) with different WSe NSs as the active layer. The fabricated PBDB-T:PCBM active layer with the addition of NS2 WSe NSs (1.5 wt%) exhibited an improved power conversion efficiency (PCE) of 9.2%, which is higher than the pure and NS1 and NS3 WSe blended active layer-encompassing devices. The improved PCE is attributed to the synergic enhancement of exciton dissociation and an improvement in the charge mobility through the modified active layer for polymer solar cells. Furthermore, the highest sensitivity of 2.97 mA/Gy·cm was achieved for the NS2 WSe NSs blended active layer detected by X-ray exposure over the pure polymer, and with the NS1 and NS2 WSe blended active layer. These results led to the use of transition metal dichalcogenide materials in polymer solar cells and X-ray detectors.
二维（2D）二硒化钨（WSe）因其优异的结构和光电性能，如有序的二维网络结构、高电导率和高迁移率，在光电器件领域引起了广泛关注。在本次测试中，我们首先通过超声法制备了不同尺寸（NS1-NS3）的WSe纳米片（NSs），并使用场发射扫描电子显微镜（FE-SEM）、拉曼光谱和X射线粉末衍射对其结构进行了表征。此外，我们研究了以不同WSe NSs为活性层的基于5,7-双（2-乙基己基）苯并[1,2-c:4,5-c']二噻吩-4,8-二酮（PBDB-T）：（6,6）-苯基-C71丁酸甲酯（PCBM）的聚合物太阳能电池的光伏性能。添加了NS2 WSe NSs（1.5 wt%）的PBDB-T:PCBM活性层表现出9.2%的提高的功率转换效率（PCE），高于纯的以及包含NS1和NS3 WSe混合活性层的器件。PCE的提高归因于聚合物太阳能电池中激子解离的协同增强以及通过改性活性层的电荷迁移率的改善。此外，对于通过X射线曝光检测的NS2 WSe NSs混合活性层，相对于纯聚合物以及NS1和NS2 WSe混合活性层，实现了2.97 mA/Gy·cm的最高灵敏度。这些结果促使了过渡金属二硫属化物材料在聚合物太阳能电池和X射线探测器中的应用。
