Interaction Effect between Neighboring Nonperiodic Radial Junctions on Inside Absorption and Photocurrent...

Area of Science:

• Nanotechnology
• Materials Science
• Renewable Energy

Background:

• Silicon nanowire (SiNW) cores with radial junction (RJ) structures are effective for flexible thin-film solar cells.
• Vapor-liquid-solid (VLS) grown SiNWs lead to random distribution and orientation of RJ units on uneven substrates.
• The impact of interactions between neighboring RJ units at non-equivalent sites on light absorption remains unclear.

Purpose of the Study:

• To investigate the influence of geometric parameters on light absorption in randomly distributed RJ units.
• To explore the interaction effects between neighboring RJ units at non-equivalent sites.
• To develop a simulation platform for analyzing light absorption and photocurrent generation in non-periodically nanostructured arrays.

Main Methods:

• Finite-element simulation was employed to model two RJ units at non-equivalent sites.
• SiNW geometric parameters, including tilting angle and inter-unit distance, were considered.
• Systematic study of light absorption, external quantum efficiency, and photocurrent evolution.

Main Results:

• Different arrangements of RJ units exhibit distinct light absorption behaviors.
• A single RJ model in a periodic simulation box cannot accurately represent these varied absorption patterns.
• Interactions between neighboring units significantly affect light absorption distribution.

Conclusions:

• The study provides insights into light absorption in randomly distributed RJ units for high-performance flexible solar cells.
• A universal simulation platform was established to study interactions in non-periodically nanostructured arrays.
• Understanding these interactions is crucial for optimizing photocurrent generation and solar cell efficiency.