Research Article
A PCBM-Modified TiO2 Blocking Layer towards Efficient Perovskite Solar Cells
Figure 7
(a) UV-vis spectra of TiO2 thin films with spin coating speed at 2000, 4000, and 6000 rpm, respectively. (b) UV-vis spectra of TiO2/PCBM thin films with spin coating speed at 2000, 4000, and 6000 rpm, respectively.
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