Interfacial engineering eliminates energy loss at perovskite/HTL junction

Area of Science:

• Materials Science
• Renewable Energy
• Semiconductor Physics

Background:

• Efficient FAPbI3-based devices are hindered by energy loss at the interface between n-type perovskite and p-type hole-transporting layers (HTLs).
• This energy loss limits the open-circuit voltage (Voc) and overall performance of perovskite solar cells.

Purpose of the Study:

• To develop a strategy for mitigating energy loss in FAPbI3-based devices.
• To induce an n-to-p-type transition in FAPbI3 perovskite films to create a p-type perovskite/p-type HTL junction.
• To enhance the open-circuit voltage (Voc) of perovskite solar cells.

Main Methods:

• Controlled formation of iodine vacancies within the FAPbI3 perovskite layer.
• Post-deposition treatment using n-butylamine iodide to induce the n-to-p-type transition.
• Fabrication and characterization of FAPbI3-based solar devices.

Main Results:

• The n-butylamine iodide treatment successfully induced an n-to-p-type transition in FAPbI3 perovskite.
• A p-type perovskite/p-type HTL junction was formed, effectively reducing energy loss.
• The developed device achieved a high open-circuit voltage (Voc) of 1.12 V, a 14.3% improvement over control devices.

Conclusions:

• Controlling iodine vacancies offers a viable strategy to improve FAPbI3 perovskite solar cell performance.
• The n-to-p-type transition is crucial for enhancing Voc and device efficiency.
• This approach presents a promising pathway for realizing highly efficient perovskite-based optoelectronic devices.