Open AccessDual Passivation of Perovskite and SnO 2 for High‐Efficiency MAPbI 3 Perovskite Solar Cells
Author(s) -
Chen Yali,
Zuo Xuejiao,
He Yiyang,
Qian Fang,
Zuo Shengnan,
Zhang Yalan,
Liang Lei,
Chen Zuqin,
Zhao Kui,
Liu Zhike,
Gou Jing,
Liu Shengzhong Frank
Publication year - 2021
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202001466
Subject(s) - passivation , perovskite (structure) , materials science , energy conversion efficiency , grain boundary , optoelectronics , europium , ion , chemical engineering , nanotechnology , layer (electronics) , microstructure , chemistry , luminescence , metallurgy , organic chemistry , engineering
So far, most techniques for modifying perovskite solar cells (PSCs) focus on either the perovskite or electron transport layer (ETL). For the sake of comprehensively improving device performance, a dual‐functional method of simultaneously passivating trap defects in both the perovskite and ETL films is proposed that utilizes guidable transfer of Eu 3+ in SnO 2 to perovskite. Europium ions are distributed throughout the SnO 2 film during the formation process of SnO 2 , and they can diffuse directionally through the SnO 2 /perovskite interface into the perovskite, while most of the europium ions remain at the interface. Under the synergistic effect of distributed Eu 3+ in the SnO 2 and aggregated Eu 3+ at the interface, the electron mobilities of ETLs are evidently improved. Meanwhile, diffused Eu 3+ ions passivate the perovskite to reduce trap densities at the grain boundaries, which can dramatically elevate the open‐circuit voltage ( V oc ) of PSCs. Finally, the mainly PSCs coated on SnO 2 :Eu 3+ ETL achieve a power conversion efficiency of 20.14%. Moreover, an unsealed device degrades by only 13% after exposure to ambient atmosphere for 84 days.