Xia Zhetao, Zhang Chenxi, Feng Zhiying, Wu Zhixing, Wang Zengbo, Chen Xiaohong, Huang Sumei
Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, School of Physics and Electronic Science, East China Normal University, North Zhongshan Rd. 3663, Shanghai 200062, China.
School of Electronic Engineering, Bangor University, Bangor LL57 1UT, UK.
Nanomaterials (Basel). 2020 Sep 14;10(9):1830. doi: 10.3390/nano10091830.
We report new structured perovskite solar cells (PSCs) using solution-processed TiO/Au nanorods/MgO composite electron transport layers (ETLs). The proposed method is facile, convenient, and effective. Briefly, Au nanorods (NRs) were prepared and introduced into mesoporous TiO ETLs. Then, thin MgO overlayers were grown on the Au NRs modified ETLs by wet spinning and pyrolysis of the magnesium salt. By simultaneous use of Au NRs and MgO, the power conversion efficiency of the PSC device increases from 14.7% to 17.4%, displaying over 18.3% enhancement, compared with the reference device without modification. Due to longitudinal plasmon resonances (LPRs) of gold nanorods, the embedded Au NRs exhibit the ability to significantly enhance the near-field and far-field (plasmonic scattering), increase the optical path length of incident photons in the device, and as a consequence, notably improve external quantum efficiency (EQE) at wavelengths above 600 nm and power conversion efficiency (PCE) of PSC solar cells. Meanwhile, the thin MgO overlayer also contributes to enhanced performance by reducing charge recombination in the solar cell. Theoretical calculations were carried out to elucidate the PV performance enhancement mechanisms.
我们报道了使用溶液处理的TiO/Au纳米棒/MgO复合电子传输层（ETL）的新型结构化钙钛矿太阳能电池（PSC）。所提出的方法简便、便捷且有效。简而言之，制备了Au纳米棒（NR）并将其引入介孔TiO ETL中。然后，通过镁盐的湿纺丝和热解在Au NR修饰的ETL上生长薄的MgO覆盖层。通过同时使用Au NR和MgO，与未修饰的参考器件相比，PSC器件的功率转换效率从14.7%提高到17.4%，显示出超过18.3%的提升。由于金纳米棒的纵向等离子体共振（LPR），嵌入的Au NR具有显著增强近场和远场（等离子体散射）、增加器件中入射光子的光程长度的能力，因此，在波长高于600 nm时显著提高外部量子效率（EQE）和PSC太阳能电池的功率转换效率（PCE）。同时，薄的MgO覆盖层也通过减少太阳能电池中的电荷复合有助于提高性能。进行了理论计算以阐明光伏性能增强机制。
