[Bulk heterojunction solar cell based on porphyrin compounds].

Area of Science:

• Materials Science
• Organic Electronics
• Photovoltaics

Context:

• Organic solar cells (OSCs) offer a promising alternative to traditional silicon-based photovoltaics due to their potential for low-cost manufacturing and flexibility.
• Porphyrin derivatives have emerged as potential donor materials in OSCs owing to their tunable electronic properties and strong light absorption.
• Solution processing techniques, such as spin-coating, are crucial for scalable and cost-effective fabrication of OSCs.

Purpose:

• To synthesize novel porphyrin materials for use as donors in organic solar cells.
• To fabricate and characterize organic solar cells using synthesized porphyrins (TPP, TPPCu, TMPPFeCl) and PCBM as an acceptor.
• To investigate the effect of the donor-acceptor weight ratio on the photovoltaic performance of the fabricated devices.

Summary:

• Three porphyrin compounds, TPP, TPPCu, and TMPPFeCl, were synthesized via a one-step method.
• Organic solar cells were fabricated using these porphyrins as donors and PCBM as an acceptor through spin-coating.
• The TPP:PCBM based device demonstrated the best performance with an open-circuit voltage of 0.52 V, a short-circuit current of 0.98 mA/cm², and a fill factor of 30.1%.
• The optimal weight ratio for TPP:PCBM was found to be 1:1, with deviations leading to performance degradation.

Impact:

• The study highlights the potential of TPP as an efficient donor material in solution-processed organic solar cells.
• Optimization of the donor-acceptor ratio is critical for maximizing the performance of porphyrin-based OSCs.
• These findings contribute to the development of novel materials and device architectures for next-generation organic photovoltaic technologies.