Manipulating the Net Radiative Recombination Rate in Lead Halide Perovskite Films by Modification of Light...

Area of Science:

• Photovoltaics and Renewable Energy
• Materials Science
• Optoelectronics

Background:

• Photon recycling is crucial for photovoltaic devices operating near their theoretical efficiency limits.
• External radiative decay rates differ from internal rates due to photon recycling.
• Organic lead halide perovskites are promising photovoltaic materials.

Purpose of the Study:

• To investigate and manipulate photon recycling in organic lead halide perovskite films.
• To understand how optical design influences recombination kinetics.
• To correlate experimental observations with quantitative simulations.

Main Methods:

• Modifying underlying layer stacks to alter photon recycling probability.
• Employing time-resolved photoluminescence to observe recombination kinetics.
• Performing quantitative simulations of decay rates and emission spectra.

Main Results:

• Recombination kinetics were successfully controlled by the optical design of layer structures.
• Experimental results showed excellent agreement with quantitative simulations.
• The internal bimolecular recombination coefficient was estimated to be approximately 66% radiative.

Conclusions:

• Optical design is a key factor in controlling photon recycling in perovskite films.
• Photon recycling significantly affects the measured radiative decay rates in these materials.
• The findings provide insights into optimizing perovskite solar cells for higher efficiency.