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Mesoporous Au@Cu 2− x S Core–Shell Nanoparticles with Double Localized Surface Plasmon Resonance and Ligand Modulation for Hole‐Selective Passivation in Perovskite Solar Cells
Author(s) -
Wu Tong,
Wang Zhengchun,
Xiao Lan,
Qin Pingli,
Qin Zhongli,
Ma Liang,
Zeng Wei,
Chen Xiangbai,
Xiong Liangbin,
Fang Guojia
Publication year - 2021
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202100358
Subject(s) - passivation , surface plasmon resonance , mesoporous material , materials science , nanoparticle , perovskite (structure) , nanomaterials , nanocrystal , plasmon , nanotechnology , optoelectronics , chemistry , layer (electronics) , crystallography , biochemistry , catalysis
Core–shell nanomaterials have led to their fascinating properties in optical applications due to the localized surface plasmon resonance (LSPR). Herein, a mesoporous core–shell Au@Cu 2− x S nanomaterial with dual LSPR characteristics is introduced to stabilize and passivate the perovskite/spiro‐OMeTAD interface of perovskite solar cells (PSCs). Thanks to the LSPR, Au@Cu 2− x S nanoparticles (NPs) have the potential to enhance the infrared absorption and intensify the local electric field at the perovskite/spiro‐OMeTAD interface. The embedding of the mesoporous Au@Cu 2− x S in the spiro‐OMeTAD layer can improve the contact and form “bridges” between perovskite grains and spiro‐OMeTAD. With the help of cationic surfactant cetyltrimethylammonium bromide, these mesoporous Au@Cu 2− x S NPs can passivate surface traps and smooth the valence‐band offset at the perovskite/spiro‐OMeTAD interface for hole transferring. Furthermore, the improved hole mobility can offer balanced charge transport and prevent the carrier accumulation at interfaces. As a result, the Au@Cu 2− x S(20:10)‐based PSCs achieves a champion efficiency over 22%, higher than that of the Au@Cu 2− x S‐based device.