Enhancing Photostability of Complex Lead Halides through Modification with Antibacterial Drug Octenidine

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Hybrid perovskite solar cells offer high power-conversion efficiencies.
• Limited photostability hinders commercialization of perovskite solar technology.

Purpose of the Study:

• To enhance the intrinsic photostability of perovskite solar cell materials.
• To investigate the use of octenidine dihydroiodide as a stabilizing agent.

Main Methods:

• Modification of perovskite formulations (MAPbI3, FAPbI3, Cs0.12FA0.88PbI3, Cs0.10MA0.15FA0.75PbI3) with octenidine dihydroiodide.
• Exposure to continuous light (110 mW/cm2) to assess photostability.
• Performance evaluation of solar cells using modified perovskite materials.

Main Results:

• Significant suppression of perovskite film recrystallization and decomposition observed.
• Photostability achieved up to 9000 h (Oct(FA)n-1PbnI3n+1) and 20,000 h (Oct(Cs0.12FA0.88)n-1PbnI3n+1).
• Comparable solar cell performance between modified and unmodified perovskite compositions.

Conclusions:

• Octenidine dihydroiodide effectively improves perovskite photostability without compromising performance.
• The approach shows great potential for designing highly photostable and efficient light absorbers.
• Results provide guidelines for rational material design to enhance perovskite solar cell operational stability.