High efficiency MAPbI_3-xCl_x perovskite solar cell via interfacial passivation

Area of Science:

• Materials Science
• Renewable Energy
• Semiconductor Physics

Background:

• Trap states at the perovskite/charge-transport layer interface critically impact perovskite solar cell (PSC) efficiency.
• Understanding and mitigating these interfacial defects is crucial for advancing PSC technology.

Purpose of the Study:

• To investigate the effect of introducing LiF or PbF2 thin layers at the SnO2/perovskite interface.
• To improve charge collection and reduce interfacial recombination in MAPbI3-xClx perovskite solar cells.

Main Methods:

• Fabrication of MAPbI3-xClx perovskite solar cells with an inserted LiF or PbF2 interfacial layer.
• Characterization of device performance, focusing on open-circuit voltage (Voc) and short-circuit current (Jsc).
• Analysis of interfacial properties to understand charge dynamics and recombination mechanisms.

Main Results:

• Demonstration of high-efficiency MAPbI3-xClx perovskite solar cells.
• Significant improvements in both open-circuit voltage (Voc) and short-circuit current (Jsc) were observed.
• Reduced interfacial charge recombination and enhanced charge collection were achieved by the LiF/PbF2 passivation layers.

Conclusions:

• Interfacial passivation using LiF or PbF2 is an effective strategy for fabricating high-performance perovskite solar cells.
• This approach offers a new pathway to achieve perovskite solar cells with large open-circuit voltage (Voc).
• The findings highlight the importance of interface engineering in optimizing PSCs.