Solution Processed Bi-Based Sensitized Solar Cell: Effects of Post Heat Treatment

Area of Science:

• Materials Science
• Nanotechnology
• Photovoltaics

Background:

• Quantum dot-sensitized solar cells (QDSSC) utilize nanosize semiconductors as active sensitizers.
• Traditional QDSSC often employ toxic cadmium (Cd) and lead (Pb) based compounds.
• Development of "green" sensitizers is crucial for safer and more sustainable solar energy applications.

Purpose of the Study:

• To fabricate and evaluate bismuth sulfide (Bi₂S₃) quantum dots (QDs) as green sensitizers for QDSSC.
• To investigate the impact of post heat treatment on the performance of Bi₂S₃-sensitized TiO₂ electrodes.
• To determine the optimal heat treatment temperature profile for performance enhancement.

Main Methods:

• Fabrication of Bi₂S₃ quantum dots (QDs).
• Deposition of Bi₂S₃ QDs onto a TiO₂ electrode via a solution dipping process.
• Application of post heat treatment with varying temperature profiles.

Main Results:

• Successful fabrication and application of Bi₂S₃ QDs as sensitizers in QDSSC.
• Post heat treatment demonstrably enhances the performance of the green QDSSC.
• Performance improvement is dependent on the heat treatment temperature, with gradual increases being preferable.

Conclusions:

• Bi₂S₃ quantum dots represent a promising non-toxic alternative for QDSSC.
• Post heat treatment is an effective strategy to improve the efficiency of Bi₂S₃-based QDSSC.
• Careful control of the heat treatment temperature profile is essential for maximizing performance gains.