Journal
CHEMISTRY OF MATERIALS
Volume 34, Issue 7, Pages 3346-3356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.2c00146
Keywords
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Funding
- National Key Research and Development Program of China [2020YFB0408002]
- Guangdong Laboratory of Chemistry and Fine Chemical Industry Jieyang Center [QD20221001]
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Introducing fluorosubstituted aromatic alkylammonium spacer cations can effectively enhance the performance and stability of quasi-two-dimensional perovskite solar cells.
It is an effective strategy to improve the performance of quasi-two-dimensional (Q-2D) perovskite solar cells (PSCs) by introducing fluorosubstituted aromatic alkylammonium spacer cations into the active layer. Herein, the influence of the benzylammonium (BA) and the x-fluorobenzy-lammonium (xFBA) cation, in which x stands for the substitution position of the benzene ring (o, ortho; m, meta; p, para), on the crystal orientation, phase distribution, film morphology of the Q2D (n = 5) perovskite films, and the corresponding device performance is systematically evaluated. The result suggests that compared with BA and oFBA, mFBA and pFBA have a larger dipole moment, forming a dense perovskite film with gradient structures where the n = 1 2D perovskite mainly exists at the top of the film and the large n-phase perovskite exists at the bottom of the film. Encouragingly, the (pFBA)(2)MA(4)Pb(5)I(16) (MA = CH3NH3+)-based perovskite solar cells achieve the highest efficiency of 17.12%, with an open-circuit voltage of 1.175 V, a short-circuit current density of 18.50 mA cm(-2), and a fill factor of 78.78%, which is significantly higher than those of BA (14.07%)-, oFBA (12.89%)-, and mFBA (14.67%)-based PSCs. Furthermore, pFBA-based devices also exhibit the best stability compared to the other three devices.
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