Flexible Indoor Perovskite Solar Cells by In Situ Bottom-Up Crystallization Modulation and Interfacial Passivation

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• A robust perovskite-buried interface is critical for efficient charge transport in flexible indoor photovoltaics.
• Interfacial defects and crystallization significantly impact device performance.

Purpose of the Study:

• To introduce a molecular bridge strategy using sodium 2-cyanoacetate (SZC) for in situ interface passivation and crystallization modulation.
• To enhance the performance of flexible indoor perovskite solar cells.

Main Methods:

• Utilized sodium 2-cyanoacetate (SZC) as an additive at the perovskite-buried interface.
• Employed theoretical calculations and experimental evidence to study SZC's effects.
• Investigated in situ perovskite crystallization dynamics.

Main Results:

• SZC acts as a molecular bridge, passivating oxygen vacancy and under-coordinated Pb defects.
• Improved interfacial energy level alignment and carrier transport were observed.
• Achieved bottom-up crystallization modulation, leading to larger grains and reduced lattice strain.
• Optimized flexible solar cells demonstrated over 41% power conversion efficiency at 1000 lux with a 84.32% fill factor.

Conclusions:

• The molecular bridge strategy effectively enhances flexible indoor perovskite solar cell performance.
• This approach offers a significant advancement for perovskite-based photovoltaics in the Internet of Things (IoT) era.