Dye‐Sensitized Solar Cells: 1, 1, 2, 2‐Tetrachloroethane (TeCA) as a Solvent Additive for Organic Hole Transport Materials and Its Application in Highly Efficient Solid‐State Dye‐Sensitized Solar Cells (Adv. Energy Mater. 10/2015). Issue 10 (May 2015)