Understanding steric-charge-dependence of conjugated passivators on p-Pb2+ bond strength for efficient all-inorganic perovskite solar cells
CHEMICAL ENGINEERING JOURNAL(2022)
摘要
Intramolecular structure of interfacial passivator highly determines the bond strength with detrimental defects located at perovskite surfaces and grain boundaries. Herein, we investigate the steric-charge-dependence of various pi-conjugated pyridine derivatives on electron-donating ability to passivate inorganic CsPbIBr2 perovskite film. The primary results demonstrate that the photovoltaic performances tightly correlate with the multidentate coordination sites and structure-steric hindrance because of their synergistic regulation on intramolecular electron-cloudy density and charge extraction. Comparing to pyridine and terpyridine treated devices, the bipyridine passivated device delivers an increased efficiency of 11.04% with a high open-circuit voltage of 1.301 V and improved stability after persistent irradiation over 20 h and storage for 60 days, which is one of the highest efficiencies for carbon-based all-inorganic CsPbIBr2 solar cells. This work provides a direction to choose ideal passivator for high-efficiency perovskite optoelectronics.
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关键词
All-inorganic perovskite solar cells, <p>CsPbIBr2</p>, Pyridine derivatives, Defect passivation, Intramolecular charge distribution
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