Liu Jian, Lu Shunmian, Zhu Lu, Li Xinchen, Choy Wallace C H
Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
Nanoscale. 2016 Feb 14;8(6):3638-46. doi: 10.1039/c5nr07457f. Epub 2016 Jan 26.
In this study, we present a two-terminal perovskite (PVSK)-organic hybrid tandem solar cell with a nanostructured PVSK as the light window and a PFN/doped MoO3/MoO3 structure as the interconnecting layer (ICL). In this tandem structure, the PVSK layer is specially designed with a nanostructured surface morphology; thus the PCBM could be filled-up for forming intimately contacted interface with PVSK layers. This design could not only efficiently increase the device performance, it could also greatly remove the hysteresis of PVSK solar cells. The study indicates that doped MoO3 as the step layer plays a key role in protecting the underlying layer against multi-solution processes and aids in the efficient recombination of electrons and holes generated from the sub-cells. The hybrid tandem solar cell could achieve a high VOC of 1.58 V, which is the sum of those in the two sub-cells, and a high FF of 0.68, indicating the effectiveness of the multilayer ICL.
在本研究中，我们展示了一种双端钙钛矿（PVSK）-有机混合串联太阳能电池，其具有纳米结构的PVSK作为光窗口，以及PFN/掺杂的MoO3/MoO3结构作为互连层（ICL）。在这种串联结构中，PVSK层经过特殊设计，具有纳米结构的表面形态；因此，PCBM可以被填充，以与PVSK层形成紧密接触的界面。这种设计不仅可以有效地提高器件性能，还可以大大消除PVSK太阳能电池的滞后现象。研究表明，掺杂的MoO3作为台阶层，在保护下层免受多溶液过程的影响以及辅助子电池产生的电子和空穴的有效复合方面起着关键作用。这种混合串联太阳能电池可以实现1.58 V的高开路电压（VOC），这是两个子电池开路电压之和，以及0.68的高填充因子（FF），表明多层ICL的有效性。
