A dual functional additive for the HTM layer in perovskite solar cells

Area of Science:

• Materials Science
• Electrochemistry
• Renewable Energy

Background:

• Perovskite solar cells (PSCs) are promising for next-generation photovoltaics.
• Efficient hole-transporting materials (HTMs) are crucial for high-performance PSCs.
• Improving HTM electrical properties can enhance PSC power conversion efficiency (PCE).

Purpose of the Study:

• To investigate the dual-functional role of a novel ionic liquid, N-butyl-N'-(4-pyridylheptyl)imidazolium bis(trifluoromethane)sulfonimide (BuPyIm-TFSI).
• To enhance the electrical properties of HTMs for perovskite solar cells.
• To improve the overall power conversion efficiency of PSCs.

Main Methods:

• Synthesis and characterization of BuPyIm-TFSI.
• Incorporation of BuPyIm-TFSI as an additive into the HTM layer of PSCs.
• Electrical characterization of HTM and performance evaluation of PSCs.

Main Results:

• BuPyIm-TFSI significantly improved the conductivity of the hole-transporting material.
• The ionic liquid additive effectively reduced the dark current of the perovskite solar cells.
• A substantial increase in the power conversion efficiency of the PSCs was achieved.

Conclusions:

• BuPyIm-TFSI acts as an effective dual-functional additive for PSCs.
• The enhanced electrical properties of HTMs lead to improved solar cell performance.
• Ionic liquid additives offer a viable strategy for advancing perovskite solar cell technology.