Efficient Methanol[70]fullerene/MDMO-PPV Bulk Heterojunction Photovoltaic Cells

摘要

The widespread use of solar cells as a renewable source of energy is seriously held back by the high cost of the existing crystalline silicon-based technology. The prospect of cheap reel-to-reel processing makes organic semiconducting materials interesting alternatives for the future generation of photovoltaic devices. Organic solar cells that have received considerable attention are of the so-called polymer/fullerene bulk heterojunction type. Until now, the photoactive layer of these devices routinely consists of a mixture of a π-conjugated polymer acting as electron donor, and a soluble [60]fullerene derivative, methano[60]fullerene [6,6]-phenyl C_(61) butyric acid methyl ester ([60]PCBM) as electron acceptor. Optimized internal quantum efficiencies (IQE = fraction of absorbed photons converted to electric current) close to 100% have been reported, which demonstrates that very efficient charge generation and collection can be achieved.