Nanoflower-like P-doped Nickel Oxide as a Catalytic Counter Electrode for Dye-Sensitized Solar Cells oleh Yi-Lin Chen, Yi-June Huang, Min-Hsin Yeh, Miao-Syuan Fan, Cheng-Tai Lin, Ching-Cheng Chang, Vittal Ramamurthy, Kuo-Chuan Ho