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Dual Passivation of CsPbI 3 Perovskite Nanocrystals with Amino Acid Ligands for Efficient Quantum Dot Solar Cells
Author(s) -
Jia Donglin,
Chen Jingxuan,
Yu Mei,
Liu Jianhua,
Johansson Erik M. J.,
Hagfeldt Anders,
Zhang Xiaoliang
Publication year - 2020
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202001772
Subject(s) - passivation , materials science , nanocrystal , perovskite (structure) , quantum dot , ligand (biochemistry) , carrier lifetime , solar cell , photovoltaic system , nanotechnology , optoelectronics , chemistry , crystallography , silicon , biology , biochemistry , layer (electronics) , receptor , ecology
Inorganic CsPbI 3 perovskite quantum dot (PQD) receives increasing attention for the application in the new generation solar cells, but the defects on the surface of PQDs significantly affect the photovoltaic performance and stability of solar cells. Herein, the amino acids are used as dual‐passivation ligands to passivate the surface defects of CsPbI 3 PQDs using a facile single‐step ligand exchange strategy. The PQD surface properties are investigated in depth by combining experimental studies and theoretical calculation approaches. The PQD solid films with amino acids as dual‐passivation ligands on the PQD surface are thoroughly characterized using extensive techniques, which reveal that the glycine ligand can significantly improve defect passivation of PQDs and therefore diminish charge carrier recombination in the PQD solid. The power conversion efficiency (PCE) of the glycine‐based PQD solar cell (PQDSC) is improved by 16.9% compared with that of the traditional PQDSC fabricated with Pb(NO 3 ) 2 treating the PQD surface, owning to improved charge carrier extraction. Theoretical calculations are carried out to comprehensively understand the thermodynamic feasibility and favorable charge density distribution on the PQD surface with a dual‐passivation ligand.