Abstract
Poly(3‐hexylthiophene) (P3HT) is p‐doped by the new soluble dopant molybdenum tris[1‐(methoxycarbonyl)‐2‐(trifluoromethyl)‐ethane‐1,2‐dithiolene] and investigated via photoemission spectroscopy and transport measurements. Soft‐contact transfer lamination of thin layers of the doped P3HT on undoped polymer layers is used to create spatially‐confined doped regions, which serve as hole‐injection contacts on P3HT diodes. This strategy is then used to create efficient hole‐collecting contacts on solution‐processed inverted polymer solar cells.
An ultrathin layer of P3HT p‐doped with the soluble, oxidizing molecule Mo(tfd‐ CO2Me)3, is transferred onto the active layer of a device via soft‐contact lamination from a PDMS stamp. This novel approach can be used to introduce a spatially‐ confi ned highly‐doped layer on a solution‐ processed device, thereby creating an effi cient hole‐collecting or ‐injecting contact. An application to solar cells is demonstrated.
