Interface Modification Using Li-Doped Hollow Titania Nanospheres for High-Performance Planar Perovskite Solar Cells

Caixiang Zhao; Junfeng Shu; Jiaqi Fang; Shuangxia Luo; Yanjun Guo; Peng Xu; Ji Feng; Meng He; Zhan'ao Tan; Xiong Yin; Leyu Wang

doi:10.1021/acsami.3c09455

Interface Modification Using Li-Doped Hollow Titania Nanospheres for High-Performance Planar Perovskite Solar Cells

ACS Appl Mater Interfaces. 2023 Oct 11;15(40):46925-46932. doi: 10.1021/acsami.3c09455. Epub 2023 Sep 28.

Authors

Caixiang Zhao¹, Junfeng Shu¹, Jiaqi Fang¹, Shuangxia Luo¹, Yanjun Guo², Peng Xu², Ji Feng³, Meng He², Zhan'ao Tan¹, Xiong Yin^{1

3}, Leyu Wang¹

Affiliations

¹ State Key Laboratory of Chemical Resource Engineering, Innovation Centre for Soft Matter Science and Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, China.
² CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, National Center for Nanoscience and Technology, Beijing 100190, China.
³ Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States.

PMID: 37769342
DOI: 10.1021/acsami.3c09455

Abstract

Titania nanospheres have been utilized as building blocks of electron transporting layers (ETLs) for mesoscopic perovskite solar cells (PSCs). Nevertheless, the power conversion efficiencies (PCEs) reported so far for the mesoscopic PSCs containing titania nanospheres are generally lower than those of the state-of-the-art planar PSCs. Here, we have prepared Li-doped hollow titania nanospheres (Li-HTS) through a "cation-exchange" approach and used them for the first time to modify the SnO₂ ETL/perovskite interfaces of planar PSCs. The Li-HTS-modified PSC delivered a PCE of 23.28% with a fill factor (FF) of over 80%, which is significantly higher than the PCE of the control device (20.51%). This is the best PCE achieved for PSCs containing titania nanospheres. Moreover, interfacial modification using Li-HTS greatly improves the stability of the PSCs. This work demonstrates the potential of interface modification using inorganic nanostructures for enhancing the efficiency and stability of planar PSCs.

Keywords: Li-doped titania; hollow titania spheres; interface modification; perovskite solar cell; stability.