Xiao Guo-Bin, Mu Xijiao, Zhou Shuyu, Zhu Liu, Peng Yong, Liang Qing, Zou Xiaoxin, Zhang Jian, Zhang Lei, Cao Jing
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China.
Angew Chem Int Ed Engl. 2023 Apr 17;62(17):e202218478. doi: 10.1002/anie.202218478. Epub 2023 Mar 3.
Typical wide-band gap cathode interlayer materials are difficulty in reducing interface recombination without limiting charge transport in perovskite solar cells (PSCs). Here, a lead-doped titanium-oxo cluster protected by S-containing ligands is introduced at the interface of perovskite and SnO . By in situ heating, the cluster is transformed into PbSO -PbTi O heterostructure. The oxygen atoms from sulfate ion in heterostructure connect with iodine from perovskite to boost interfacial electron extraction and reduce charge recombination. While the yielded metallic interface between PbSO and PbTi O promotes the electron transport across the interface. Finally, an efficiency as high as 24.2 % for the modified PSC is obtained. The heterostructure well-stabilize the interface of perovskite and SnO , to greatly improve the device stability. This work provides a novel strategy to prepare wide-band gap cathode interlayer by directional transformation of heterometallic oxo clusters.
典型的宽带隙阴极界面层材料在不限制钙钛矿太阳能电池（PSC）中电荷传输的情况下，难以减少界面复合。在此，一种由含硫配体保护的铅掺杂钛氧簇被引入到钙钛矿和SnO的界面处。通过原位加热，该簇转变为PbSO -PbTiO异质结构。异质结构中硫酸根离子的氧原子与钙钛矿中的碘相连，以促进界面电子提取并减少电荷复合。而PbSO和PbTiO之间产生的金属界面促进了电子跨界面传输。最终，改性PSC获得了高达24.2%的效率。该异质结构很好地稳定了钙钛矿和SnO的界面，大大提高了器件稳定性。这项工作为通过异金属氧簇的定向转变制备宽带隙阴极界面层提供了一种新策略。
