Journal
ADVANCED ENERGY AND SUSTAINABILITY RESEARCH
Volume 4, Issue 3, Pages -Publisher
WILEY
DOI: 10.1002/aesr.202200173
Keywords
defect passivation; perovskite solar cells; tetra-butylammonium trifluoromethanesulfonate
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In this study, an ionic liquid (tetra-butylammonium trifluoromethanesulfonate, TBASF) is used to treat perovskite films. The butylammonium cation binds the unreacted PbI2 and forms a low-dimensional material on the perovskite surface, while the trifluoromethanesulfonate anion passivates the uncoordinated Pb2+ and stabilizes I- on the perovskite surface. The treated perovskite solar cells achieve a champion PCE of 22.80% and excellent stability in highly humid conditions.
The quality of perovskite films plays a crucial role in the performance of perovskite solar cells (Pero-SCs) in terms of power conversion efficiency (PCE) and stability. Herein, an ionic liquid, tetra-butylammonium trifluoromethanesulfonate (denoted TBASF), is used to treat perovskite films. The tetra-butylammonium cation (TBA(+)) can bind the unreacted PbI2 and form a low-dimensional material on the surface of the perovskite. This membrane improves the water resistance of the perovskite film. Meanwhile, trifluoromethanesulfonate anion (SF-) can passivate the uncoordinated Pb2+ and stabilize I- on the perovskite surface, which is beneficial to the stability of the devices. After the treatment, the Pero-SCs achieve a champion PCE of 22.80% and excellent stability in highly humid conditions.
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