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.
Source Publication Title
Link to Publisher's Edition
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.