Effect of Solvent Additives on the Morphology and Device Performance of Printed Non-fullerene Acceptor Based Organic Solar Cells.
Effect of Solvent Additives on the Morphology and Device Performance of Printed Non-fullerene Acceptor Based Organic Solar Cells.
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DOI：
10.1021/acsami.9b16784
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发表时间：
2019-10
影响因子：
9.5
通讯作者：
K. Wienhold;V. Körstgens;Sebastian Grott;Xin-yu Jiang;M. Schwartzkopf;S. Roth;P. Müller‐Buschbaum
中科院分区：
文献类型：
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作者：
K. Wienhold;V. Körstgens;Sebastian Grott;Xin-yu Jiang;M. Schwartzkopf;S. Roth;P. Müller‐Buschbaum
高效有机太阳能电池的活性层的印刷和通过用不同溶剂添加剂浓度处理的形态控制对于实现本体异质结光致发光的真实的世界使用是重要的，因为它能够实现器件性能的放大和优化。在这项工作中，与苯并二噻吩单元PBDB-T-SF和非富勒烯小分子受体IT 4F的共轭聚合物的活性层印刷使用弯月面引导狭缝模具涂布。添加1，8-二碘辛烷（DIO）以优化功率转换效率（PCE）。利用掠入射小角X射线散射（GISAXS）、掠入射广角X射线散射（GIWAXS）、扫描电子显微镜（SEM）和原子力显微镜（AFM）研究了不同溶剂添加浓度对材料内部纳米结构和表面形貌的影响。通过光致发光（PL）、紫外/维斯吸收光谱和外量子效率（EQE）测量研究了其光学性质，并与相应的PCE进行了关联。添加0.25体积% DIO将平均PCE从3.5提高到7.9%，而在较高浓度下，积极效果不太明显。对于用最佳溶剂添加剂浓度处理的最佳印刷器件，获得了8.95%的太阳能电池性能。因此，利用大规模制备方法，可以实现与利用旋涂方法类似的良好工作的太阳能电池的印刷。
Printing of active layers of high efficiency organic solar cells and morphology control by processing with varying solvent additive concentrations are important to realize real world use of bulk heterojunction photovoltaics as it enables both, up scaling and optimization of the device performance. In this work, active layers of the conjugated polymer with benzodithiophene units PBDB-T-SF and the non fullerene small molecule acceptor IT 4F are printed using meniscus guided slot die coating. 1,8 diiodoctane (DIO) is added to optimize the power conversion efficiency (PCE). The effect on the inner nano structure and surface morphology of the material is studied for different solvent additive concentrations with grazing incidence small angle X-ray scattering (GISAXS), grazing incidence wide angle X ray scattering (GIWAXS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Optical properties are studied with photoluminescence (PL), UV/Vis absorption spectroscopy and external quantum efficiency (EQE) measurements and correlated to the corresponding PCEs. The addition of 0.25 vol% DIO enhances the average PCE from 3.5 to 7.9 % whereas at higher concentrations the positive effect is less pronounced. A solar cell performance of 8.95 % is obtained for the best printed device processed with an optimum solvent additive concentration. Thus, with the large scale preparation method printing similarly well working solar cells can be realized as with the spin coating method.