Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Siyuan Laboratory, Department of Physics, Jinan University , Guangzhou 510632, P. R. China.
Biomolecular and Organic Electronics, Department of Physics, Chemistry and Biology (IFM), Linköping University , Linköping SE-581 83, Sweden.
ACS Appl Mater Interfaces. 2017 Dec 27;9(51):44656-44666. doi: 10.1021/acsami.7b14395. Epub 2017 Dec 14.
In this work, high-performance inverted indium tin oxide (ITO)-free semitransparent polymer solar cells are comprehensively investigated using a novel polymer/metal hybrid transparent electrode. The electrical and optical characteristics of hybrid electrodes are significantly enhanced by introducing UV/ozone plasma treatment on the polymer poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN), which is functioned as both a seed layer for ultrathin Ag metal electrode and an optical spacer for transparent devices. The optimized sheet resistance of PFN/Ag (12 nm) hybrid electrode is only half of the commercial ITO (9.4 vs 20.0 Ω sq) and the high wavelength-dependent reflectance of hybrid electrode helps to increase the ITO-free device short-circuit current density. Furthermore, the interface property between PFN and ultrathin Ag is analyzed in detail and the optical field distribution is calculated for comparison. A high power conversion efficiency of 5.02%, which is increased by 35% compared to that of the ITO-based device, is achieved in the ITO-free semitransparent device in conjunction with an excellent average visible transmittance above 28% that is higher than the benchmark of 25% for power-generating window, indicating its great potential in building integrated photovoltaic systems in the future. Furthermore, the strategy is successfully developed for other polymer systems, suggesting the universal applicability for plastic electronics.
在这项工作中，我们使用一种新型聚合物/金属混合透明电极，全面研究了高性能无铟锡氧化物（ITO）倒置半透明聚合物太阳能电池。通过在聚合物聚[(9,9-双(3'-(N,N-二甲基氨基)丙基)-2,7-芴)-交替-2,7-(9,9-二辛基芴)]（PFN）上进行紫外/臭氧等离子体处理，显著增强了混合电极的电学和光学特性，PFN 不仅可以作为超薄 Ag 金属电极的种子层，还可以作为透明器件的光学间隔层。优化后的 PFN/Ag（12nm）混合电极的方阻仅为商用 ITO 的一半（9.4 与 20.0 Ω sq），且混合电极对高波长依赖性的反射率有助于提高无 ITO 器件的短路电流密度。此外，详细分析了 PFN 和超薄 Ag 之间的界面性质，并进行了光学场分布的计算以作比较。与基于 ITO 的器件相比，无 ITO 的半透明器件的功率转换效率提高了 35%，达到了 5.02%，同时具有超过 28%的平均可见光透过率，高于发电窗 25%的基准值，这表明其在未来建筑集成光伏系统中有很大的应用潜力。此外，该策略已成功应用于其他聚合物体系，表明其在塑料电子领域具有普遍适用性。
