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Figure 2 – uploaded by Varishetty Madhu Mohan
Figure 2 (a) Synthesized spheres of about 450 nm diameter. (b) Bilayer photo-electrode composed of P25 and colloidal solution mixture first layer/spheres and colloidal solution second layer (c) Top view of the sphere-coated photoelectrode. (d) Clear view of sprayed colloidal particle attached to the spheres. Fig. 2(a) shows the prepared 450 nm diameter spheres of TiO, while Fig. 2(c) shows the top view of the photoelectrode with spray-coated spheres as the top layer. Fig. 2(b) shows the cross-section of the photo-electrode, where the first layer about 15 um as indicated as X in Fig. 2(b) is sprayed on the FTO surface with P25/colloidal solution, followed by the second layer Y of about 8 pm thickness deposited using 450 nm spheres/colloidal solution. The magnified image in Fig. 2(d) indicates good contact between the spheres as a result of mixing of Tyco colloidal solution during the spray pyrolysis method. These connections formed by the colloidal solution particles in between the spheres enhance the electrical con- ductivity by increasing the charge transfer rate of the photoelectrode*’ and offer excellent light harvesting efficiency as the microspheres act as a good scattering layer.”*
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