Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 21, Pages 12746-12754Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta01883c
Keywords
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Funding
- Key-Area Research and Development Program of Guangdong Province [2020B010174004]
- National Natural Science Foundation of China [51776094, 91963129]
- Ministry of Science and Technology of China [2016YFA0202400, 2016YFA0202404]
- Peacock Team Project funding from Shenzhen Science and Technology Innovation Committee [KQTD2015033110182370]
- Foundation of Shenzhen Science and Technology Innovation Committee [JCYJ20180302174021198]
- Shenzhen Development and Reform Committee [2019-126]
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Introduction of a novel ion liquid NDAPBF(4) optimized the grain growth of perovskite and enhanced electron transportation, resulting in improved efficiency while maintaining high stability for MA-free PSCs.
Perovskite solar cells (PSCs) with state-of-the-art efficiencies contain thermally unstable methylammonium (MA). Avoiding MA molecules usually leads to a severe decrease in the cell efficiency. In this work, a novel ion liquid (simplified as NDAPBF(4)) possessing a pyridine cation and BF4- anion were introduced to improve the performance of MA-free PSCs. The ion liquid NDAPBF(4) can optimize the grain growth of the perovskite, leading to reduced carrier traps. In particular, NDAPBF(4) served as an n-type dopant and boosted the electron transportation in the perovskite films, which further suppressed the carrier non-radiative recombination at the interface between the perovskite and the electron transporting layer. Finally, PSCs with a Cs(0.05)FA(0.95)PbI(3) perovskite film as the absorber achieved a remarkable efficiency of 21.25%, which was one of the highest MA-free inverted perovskite solar cells up to date. PSCs doped with NDAPBF(4) also gave excellent stability, which preserved 95% and 94% of the initial efficiency after being aged for 1000 h and 500 h under room temperature and elevated temperature at 85 degrees C, respectively.
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