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Triple Interface Passivation Strategy‐Enabled Efficient and Stable Inverted Perovskite Solar Cells
Author(s) -
Gao ZhiWen,
Wang Yong,
Ouyang Dan,
Liu Hui,
Huang Zhanfeng,
Kim Jinwook,
Choy Wallace C. H.
Publication year - 2020
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202000478
Subject(s) - passivation , perovskite (structure) , non blocking i/o , materials science , thiocyanate , energy conversion efficiency , optoelectronics , chemical engineering , inorganic chemistry , chemistry , nanotechnology , layer (electronics) , crystallography , catalysis , engineering , biochemistry
Inverted perovskite solar cells (PSCs) are still suffering low power conversion efficiency because of hole accumulation and trap‐assisted non‐radiative recombination at the interface originating from the large energy offset, interface defects, and rough contact. Here, a triple passivation of the two in‐between surfaces of the hole transport layer (HTL) and perovskite is proposed. The inorganic salt of potassium thiocyanate (KSCN) is introduced to simultaneously cross‐link NiO x , HTL, and methylammonium lead iodide (MAPbI 3 ), which can significantly improve both device performances and stability. In addition to potassium passivation, the thiocyanate shows two good passivation effects on perovskite and NiO x to achieve the triple passivation. The strong NiN bonding exhibits strong polar covalent bond properties to make the electron deviate from the Ni side. Meanwhile, the strong electrostatic force between S and Pb in MAPbI 3 makes the Pb atomic layer closer to perovskite to restrain the I atom. Meanwhile, the KSCN modification leads to better valence band alignment. Eventually, the KSCN meditated PSCs exhibit both high efficiency of 21.23% with open‐circuit voltage of 1.14 V and improved operational stability. The demonstration of triple interface passivation contributes to establishing promising multiple passivation strategies for improving the demanding PSC performances and stability.