Department of Chemistry; Centre for Advanced Luminescence Materials
Bulk heterojunction solar cells have been extensively studied due to their great potential for cost-effective photovoltaic devices. Although recent advances resulted in the fabrication of poly(3-hexylthiophene) (P3HT):fullerene derivative based solar cells with efficiencies in the range 4.45.0%, theoretical calculations predict that the development of novel donor materials with a lower band gap is required to exceed the power conversion efficiency of 10%. However, all the lower band gap polymers developed to date failed to reach the efficiency of P3HT based cells. To address this issue, we synthesized a soluble, intensely colored platinum metallopolyyne with a low band gap of 1.85 eV. The solar cells, containing metallopolyyne/fullerene derivative blends as the photoactive material, showed a power conversion efficiency with an average of 4.1%, without annealing or the use of spacer layers needed to achieve comparable efficiency with P3HT. This clearly demonstrates the potential of metallated conjugated polymers for efficient photovoltaic devices.
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http://www.nature.com/nmat/journal/v6/n7/abs/nmat1909.html or doi:10.1038/nmat1909
Wong, WY, XZ Wang, Z He, AB Djurisic, CT Yip, KY Cheung, H Wang, CSK Mak, and WK Chan. "Metallated conjugated polymers as a new avenue towards high-efficiency polymer solar cells." Nature materials 6 (2007): 521-527.