Sun Yansen, Yang Shuo, Pang Zhenyu, Quan Yingnan, Song Rongfei, Chen Yu, Qi Weiheng, Gao Yanbo, Wang Fengyou, Zhang Xinyuan, Sun Yunfei, Yang Jinghai, Yang Lili, Rosei Federico
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P.R. China.
University of Chinese Academy of Sciences, Beijing 100049, P.R. China.
ACS Appl Mater Interfaces. 2021 Mar 10;13(9):10822-10836. doi: 10.1021/acsami.0c19014. Epub 2021 Feb 25.
The preferred orientation of crystalline films in hybrid perovskite materials is known to influence the performance of perovskite solar cells (PSCs). Although the preferred growth along the (112) directions has been reported to promote charge transport within the Pb-based polycrystalline perovskite films, the preferred orientation growth of this facet is still difficult to be achieved due to the higher formation energy compared with the (110) plane. Herein, Sn-Pb binary perovskite films with a well-controlled orientation along the (224) plane were achieved by introducing a simple ultrasonic treatment (UST) into the additive engineering fabricated method. UST is used to process the perovskite precursor solutions of tartaric acid (TA) modified Sn-Pb binary polycrystalline perovskite films to regulate the interactions between PbI/SnI and TA in the intermediate phases. Meanwhile, TA-modulated MACsPbSnI-based perovskite films with a preferred orientation of (224) crystal plane were obtained by precisely controlling the UST time to 15 min. The highest power conversion efficiency (PCE) of 15.59% with less hysteresis and improved stability was achieved, while realizing 8.64 and 25.32% enhancements of PCE compared with that of TA-based and control counterparts with (110) preferred orientation, respectively. Our work provides a promising route to obtain preferred orientation growth of polycrystalline perovskite films. In particular, we have shown that this approach improves the performance of Sn-Pb binary PSCs, while such methodology is quite flexible and could also be applied to other low-/non-toxic PSCs.
已知混合钙钛矿材料中晶体薄膜的择优取向会影响钙钛矿太阳能电池（PSC）的性能。尽管据报道沿（112）方向的择优生长可促进铅基多晶钙钛矿薄膜内的电荷传输，但由于与（110）平面相比形成能更高，该晶面的择优取向生长仍难以实现。在此，通过在添加剂工程制备方法中引入简单的超声处理（UST），实现了沿（224）平面具有良好可控取向的Sn-Pb二元钙钛矿薄膜。UST用于处理酒石酸（TA）修饰的Sn-Pb二元多晶钙钛矿薄膜的钙钛矿前驱体溶液，以调节中间相中PbI/SnI与TA之间的相互作用。同时，通过将UST时间精确控制在15分钟，获得了具有（224）晶面择优取向的TA调制的MACsPbSnI基钙钛矿薄膜。实现了最高功率转换效率（PCE）为15.59%，滞后较小且稳定性提高，与具有（110）择优取向的TA基和对照样品相比，PCE分别提高了8.64%和25.32%。我们的工作为获得多晶钙钛矿薄膜的择优取向生长提供了一条有前景的途径。特别是，我们已经表明这种方法提高了Sn-Pb二元PSC的性能，同时这种方法非常灵活，也可应用于其他低/无毒PSC。
