4. B. Meng, Y. Y. Fu, Z. Y. Xie, J. Liu*, L. X. Wang*, Phosphonate-Functionalized Donor Polymer as an Underlying Interlayer to Improve Active Layer Morphology in Polymer Solar Cells, Macromolecules, 2014, 47, 6246.

http://pubs.acs.org/doi/pdf/10.1021/ma5008754

3. L. Zhang, Z. J. Zhang, C. Z. He, L. M. Dai, J. Liu*, L. X. Wang, Rationally Designed Surfactants for Few-Layered Graphene Exfoliation: Ionic Groups Attached to Electron-Deficient pi-Conjugated Unit through Alkyl Spacers, ACS Nano, 2014, 8, 6663.

http://pubs.acs.org/doi/pdf/10.1021/nn502289w

2. J. Liu, G. Kim, Y. H. Xue, J. Y. Kim, J.-B. Baek, M. Durstock, L. M. Dai*, Graphene Oxide Nanoribbon as Hole Extraction Layer to Enhance Efficiency and Stability of Polymer Solar Cells, Adv. Mater., 2014, 26, 786.

http://onlinelibrary.wiley.com/doi/10.1002/adma.201302987/epdf

1. J. Liu*, M. Durstock, L. M. Dai*, Graphene Oxide Derivatives as Hole- and Electron-Extraction Layers for High-Performance Polymer Solar Cells, Energy Environ. Sci., 2014, 7, 1297.

http://pubs.rsc.org/en/content/articlepdf/2014/ee/c3ee42963f