Analytical Model for Current-Voltage Characteristics in Perovskite Solar Cells Incorporating Bulk and Surface...

Area of Science:

• Photovoltaics and renewable energy science.
• Semiconductor device physics.
• Materials science for energy applications.

Background:

• Perovskite solar cells (PSCs) show great promise for efficient solar energy conversion.
• Surface recombination is a critical loss mechanism in PSCs, affecting device performance.
• Accurate modeling of carrier dynamics is essential for optimizing PSCs.

Purpose of the Study:

• To investigate the impact of surface recombination on carrier profiles and photocurrent in PSCs.
• To develop an analytical model for photocurrent considering bulk and interface recombination.
• To validate the model with experimental data and extract transport parameters.

Main Methods:

• Solving continuity equations for electrons and holes under drift-diffusion.
• Incorporating an exponential carrier generation profile and recombination at bulk and interfaces.
• Deriving an analytical expression for solar-induced photocurrent.
• Fitting the model to published experimental data.

Main Results:

• Surface recombination rate strongly influences carrier profiles and photocurrent.
• An analytical expression for photocurrent was derived, accounting for recombination.
• The model accurately predicts experimental results, validating its predictive power.
• Model fitting provides insights into interface and bulk charge transport parameters.

Conclusions:

• Surface recombination is a key factor limiting charge collection efficiency in PSCs.
• The developed analytical model offers a valuable tool for understanding and optimizing PSC performance.
• The study provides a method for characterizing charge transport properties in perovskite materials.