Tryptamine Terminated Low-Dimensional Interfaces Enabled High Performance Perovskite/Silicon Tandem Solar Cells

Area of Science:

• Materials Science
• Photovoltaics
• Chemical Engineering

Background:

• High-quality interfaces are crucial for efficient solar cell performance.
• Low-dimensional perovskite structures offer effective surface passivation and stability.
• Terminal molecules can hinder charge transport if energy levels are misaligned.

Purpose of the Study:

• To explore tryptamine as a terminal molecule for low-dimensional structures in perovskite solar cells.
• To simultaneously achieve excellent surface passivation and interfacial carrier transport.
• To enhance the performance and stability of perovskite solar cells and perovskite/silicon tandem cells.

Main Methods:

• Synthesized a low-dimensional structure using a tryptamine terminal molecule.
• Investigated the electronic properties and energy level alignment at the interface.
• Fabricated and characterized single-junction and tandem perovskite solar cells.

Main Results:

• The tryptamine molecule's HOMO level aligned well with the perovskite, enhancing orbital coupling.
• Achieved a 23.53% efficiency and 1.266 V open-circuit voltage (V_OC) for single-junction cells.
• Demonstrated a 33.22% efficiency and 1.987 V V_OC for perovskite/silicon tandem cells.
• Observed suppressed halide phase segregation and enhanced operational stability.

Conclusions:

• Tryptamine-based low-dimensional structures effectively passivate perovskite surfaces and facilitate carrier transport.
• This approach significantly boosts the performance of perovskite solar cells and tandem devices.
• The strategy offers a promising pathway for developing stable and highly efficient perovskite solar technologies.