Absorption enhancement by semi-cylindrical-shell-shaped structures for an organic solar cell application

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Organic solar cells (OSCs) offer flexibility and low-cost manufacturing.
• Improving energy conversion efficiency is crucial for practical OSC applications.

Purpose of the Study:

• To investigate the use of semi-cylindrical-shell structures for enhancing light absorption in OSCs.
• To analyze the impact of these structures on absorption spectra and angular dependence.

Main Methods:

• Utilized finite-difference time-domain (FDTD) and finite element analysis (FEA).
• Simulated absorption spectra for debossed and embossed semi-cylindrical-shell structures.
• Investigated the P3HT:ICBA active layer material.

Main Results:

• Absorption enhancement increases with cylinder radius, saturating around 4 µm.
• Achieved 51-52% average absorption enhancement for TE-polarized light and 30-33% for TM-polarized light (compared to flat structures).
• Broadened the incidence angle range for high absorption to 70°-80°.

Conclusions:

• Semi-cylindrical-shell structures effectively enhance light absorption in OSCs.
• The proposed structures exhibit broadband absorption characteristics.
• The enhanced angular acceptance is beneficial for applications on curved surfaces.