Enhanced efficiency in plastic solar cells via energy matched solution processed NiOx interlayers - Armstrong, Neal R.; Berry, Joseph J.; Curtis, Calvin J.; Ginley, David S.; Kahn, Antoine.; Lloyd, Matthew T.; Meyer, Jens.; Ndione, Paul F.; Olson, Dana C.; Ratcliff, Erin L.; Steirer, K. Xerxes.; Widjonarko, N. Edwin.