Sun Xiaolin, Li Lu, Shen Shanshan, Wang Fang
School of Aeronautical Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210046, China.
School of Electrical Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210046, China.
Nanomaterials (Basel). 2023 Jan 6;13(2):249. doi: 10.3390/nano13020249.
The electron transport layer (ETL) has been extensively investigated as one of the important components to construct high-performance perovskite solar cells (PSCs). Among them, inorganic semiconducting metal oxides such as titanium dioxide (TiO), and tin oxide (SnO) present great advantages in both fabrication and efficiency. However, the surface defects and uniformity are still concerns for high performance devices. Here, we demonstrated a bilayer ETL architecture PSC in which the ETL is composed of a chemical-bath-deposition-based TiO thin layer and a spin-coating-based SnO thin layer. Such a bilayer-structure ETL can not only produce a larger grain size of PSCs, but also provide a higher current density and a reduced hysteresis. Compared to the mono-ETL PCSs with a low efficiency of 16.16%, the bilayer ETL device features a higher efficiency of 17.64%, accomplished with an open-circuit voltage of 1.041 V, short-circuit current density of 22.58 mA/cm, and a filling factor of 75.0%, respectively. These results highlight the unique potential of TiO/SnO combined bilayer ETL architecture, paving a new way to fabricate high-performance and low-hysteresis PSCs.
作为构建高性能钙钛矿太阳能电池（PSC）的重要组件之一，电子传输层（ETL）已得到广泛研究。其中，无机半导体金属氧化物，如二氧化钛（TiO）和氧化锡（SnO），在制造工艺和效率方面都具有很大优势。然而，表面缺陷和均匀性仍是高性能器件需要关注的问题。在此，我们展示了一种双层ETL结构的PSC，其中ETL由基于化学浴沉积的TiO薄层和基于旋涂的SnO薄层组成。这种双层结构的ETL不仅可以使PSC产生更大的晶粒尺寸，还能提供更高的电流密度并减少滞后现象。与效率低至16.16%的单ETL PSC相比，双层ETL器件具有更高的效率，达到17.64%，其开路电压为1.041 V，短路电流密度为22.58 mA/cm²，填充因子为75.0%。这些结果突出了TiO/SnO组合双层ETL结构的独特潜力，为制造高性能、低滞后的PSC开辟了一条新途径。
