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. 2017 Dec 29;12:640. doi: 10.1186/s11671-017-2418-9

Fig. 4.

Fig. 4

a Conductivity measurement results of various c-TiO2. The inset depicts the structure of the sample. b Plots of − dV/dJ vs (J sc-J)−1 derived from J-V curves and the linear fitting curves