Platinum-acetylide polymers with higher dimensionality for organic solar cells

Area of Science:

• Materials Science
• Organic Electronics
• Photovoltaics

Background:

• Development of efficient conjugated polymers for solar energy conversion is crucial.
• Platinum(II)-acetylide polymers offer unique electronic and optical properties.
• Tailoring polymer structure influences charge transport and photovoltaic performance.

Purpose of the Study:

• Synthesize and characterize novel platinum(II)-acetylide polymers (P1-P3) with varying chromophore dimensions.
• Evaluate their electronic band structures and field-effect charge transport properties.
• Investigate their application and performance in bulk heterojunction solar cells.

Main Methods:

• Synthesis of platinum(II)-acetylide polymers P1-P3.
• Spectroscopic analysis for electronic band structure determination.
• Spin-coating for thin film fabrication.
• Field-effect transistor measurements for charge transport evaluation.
• Fabrication and testing of bulk heterojunction solar cells.

Main Results:

• Polymers P1-P3 exhibit strong absorption in the solar spectrum (absorption coefficient up to 1.59×10^5 cm⁻¹).
• Thin films display p-channel field-effect charge transport with hole mobilities ranging from 1.90×10⁻⁵ to 7.86×10⁻⁵ cm²/Vs.
• Higher molecular dimensionality (P2 vs. P1) improved charge carrier transport.
• A maximum power conversion efficiency of 2.24% was achieved for P3 blended with PCBM.

Conclusions:

• Multidimensional platinum(II)-acetylide polymers show enhanced photovoltaic performance compared to linear counterparts.
• These materials are suitable candidates for bulk heterojunction polymer solar cells.
• The study highlights an effective strategy for developing efficient conjugated metallopolymers for power generation.