Powering up organic solar

Organic offers many advantages over conventional semiconductors for solar-energy conversion technology. Among those advantages are low-cost, low-density and scalable surface area. However, organic also comes with a disadvantage: low efficiency. Many teams around the world are hoping to break this latter obstacle, and now US chemists have found that Stille coupling of two highly conjugated monomers can produce an organic polymer with a small band gap and high power conversion efficiency. Solar cells built from these polymers were approximately 6% efficient, which is relatively high for organic materials and inching towards the 10% tipping point.