Interfacial modification by multifunctional octocrylene for high efficiency and stable planar perovskite solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Perovskite solar cells offer high efficiency potential but suffer from instability issues.
• Defects at the perovskite surface degrade performance and operational lifetime.
• Interfacial engineering is crucial for advancing perovskite solar cell technology.

Purpose of the Study:

• To investigate the use of octocrylene (OCT) for interfacial modification of perovskite films.
• To assess the impact of OCT on defect passivation and humidity stability.
• To optimize perovskite solar cell performance through OCT treatment.

Main Methods:

• Surface modification of perovskite films using octocrylene dissolved in isopropanol (IPA).
• Characterization of perovskite films and solar cell devices to evaluate performance.
• Analysis of the passivation mechanism involving the carbonyl group of OCT and Pb2+ ions.

Main Results:

• Octocrylene effectively passivates defects on the perovskite surface via Lewis base electron interaction with Pb2+ ions.
• Modified devices showed improved humidity stability.
• An optimal octocrylene concentration yielded a peak power conversion efficiency (PCE) of 20.54% and a steady-state PCE of 19.75%.

Conclusions:

• Octocrylene is a promising material for enhancing the stability and efficiency of perovskite solar cells.
• Interfacial modification with OCT offers a viable strategy for defect passivation.
• The study demonstrates a significant improvement in perovskite solar cell performance through OCT integration.