Zhu, F., Chen, X., Lu, Z., Yang, J., Huang, S. and Sun, Z. (2013) “Efficiency Enhancement of Inverted Polymer Solar Cells Using Ionic Liquid-functionalized Carbon Nanoparticles-modified ZnO as Electron Selective Layer”, Nano-Micro Letters, 6(1), pp. 24-29. doi: 10.1007/BF03353765.