Highly-tunable nickel cobalt oxide as a low-temperature P-type contact in organic photovoltaic devices

Paul F. Ndione, Andres Garcia, N. Edwin Widjonarko, Ajaya K. Sigdel, K. Xerxes Steirer, Dana C. Olson, Philip A. Parilla, David S. Ginley, Neal R. Armstong, Robin E. Richards, Erin L. Ratcliff, Joseph J. Berry