Table 2

Effects of dye adsorption time on electron transport properties of fabricated cells
Dye adsorption time (h) Rk/Rw Mean electron lifetime (ms) Effective electron diffusion time (ms) Charge collection efficiency (%) Effective electron diffusion coefficient103cm2s1) Effective electron diffusion lengthm)
0.5 5.22 8.40 1.61 80.8 4.21 59.4
1 10.61 12.63 1.19 90.6 5.68 84.7
1.5 13.10 12.63 0.96 92.4 7.01 94.1
2 18.43 15.48 0.84 94.6 8.05 111.6
2.5 10.95 13.91 1.27 90.9 5.86 86.0
3 8.68 12.63 1.46 88.5 3.79 76.6

The thickness of the photoelectrode was 26 μm. Rk, charge transfer resistance at the ZnO/electrolyte interface; Rw, electron transport resistance in the ZnO network.

Chang et al.

Chang et al. Nanoscale Research Letters 2012 7:688   doi:10.1186/1556-276X-7-688

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