The present invention, in one aspect, relates to a solar cell. In one embodiment, the solar cell includes an anode; an active organic layer comprising an electron-donating organic material and an electron-accepting organic material; and an interfacial layer formed between the anode and active organic layer, where the interfacial layer comprises a hole-transporting polymer characterized with a hole-mobility higher than that of the electron-donating organic material in the active organic layer, and a small molecule that has a high hole-mobility and is capable of crosslinking on contact with air.
STATEMENT AS TO RIGHTS UNDER FEDERALLY-SPONSORED RESEARCH
The invention was made with government support under Contract No. DE-FG02-06ER46320 awarded by the Department of Energy of the United States. The government has certain rights to the invention.