Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 9, Pages 9149-9155Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b22040
Keywords
dimensional interface engineering; energy level modification; defect passivation; high open-circuit voltage; ambient stability; perovskite solar cell
Funding
- National Key Basic Research and Development Program of China [2016YFB041003]
- National Natural Science Foundation of China [11574009, U1605244, 61575005, 11574013, 11527901, 61775004]
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High-efficiency organic-inorganic hybrid perovskite solar cells have experienced rapid development and attracted significant attention in recent years. However, instability to an ambient environment such as moisture is a facile challenge for the application of perovskite solar cells. Herein, 1,8-octanediammonium iodide (ODAI) is employed to construct a two-dimensional modified interface by in situ combined with residual PbI2 on the formamidinium lead iodide (FAPbI(3)) perovskite surface. The ODA(2+) ion seems to lie horizontally on the surface of a three-dimensional perovskite due to its substitution for two FA(+) ions, which could protect the bulk perovskite more effectively. The unencapsulated perovskite solar cells showed notably improved stability, which remained 92% of its initial efficiency after storing in an ambient environment for 120 days. In addition, a higher open-circuit voltage of 1.13 V compared to that of the control device (1.04 V) was obtained due to the interface energy level modification and defect passivation. A champion power conversion efficiency of 21.18% was therefore obtained with a stabilized power output of 20.64% at the maximum power point for planar perovskite solar cells.
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