Incorporation of diketopyrrolopyrrole dye to improve photovoltaic performance of P3HT:PC71BM based bulk heterojunction polymer solar cells

• Diketopyrrolopyrrole based NIR organic dye py-DPP is synthesized.
• py-DPP is blended to the P3HT/PC71BM system to get ternary solar cells.
• The highest efficiency of 4.05% is achieved with 2.4 wt % of py-DPP.
• The efficiency of ternary system shows more than 20% enhancement.

Ternary blend solar cells have been intensively studied in recent years to harvest more photons over the near-IR region. In this work, the effects of adding a diketopyrrolopyrrole dye (py-DPP) into a conventional P3HT:PC71BM based bulk heterojunction photovoltaic cell are investigated. The near infrared absorption of the blend is enhanced by the doped py-DPP dye, leading to more than 20% increased power conversion efficiency compared to the P3HT:PC71BM binary system. The highest efficiency of 4.05% is achieved for a P3HT:PC71BM blend with 2.4 wt % of py-DPP.

A diketopyrrolopyrrole dye (py-DPP) is incorporated into a conventional P3HT:PC71BM based polymer bulk heterojunction photovoltaic cell. The highest efficiency of 4.05% is achieved for a P3HT:PC71BM blend with 2.4 wt % of py-DPP, corresponding to 20% increase of the power conversion efficiency.Figure optionsDownload as PowerPoint slide