Enhancing performance of ZnO dye-sensitized solar cells by incorporation of multiwalled carbon nanotubes

Table 2 Effects of incorporating MWNTs on the electron transport properties of fabricated cells

Electrode composition	Charge-transfer resistance at the ZnO/electrolyte interface [R_k] (ohm)	Electron transport resistance in the ZnO network [R_w] (ohm)	Ratio of R_k to R_w	Mean electron lifetime (ms)	Electron diffusion coefficient in the photoanode (10^-4 cm² s^-1×)	Effective electron diffusion length (micrometer)
ZnO	50.17	6.49	7.73	10.30	4.80	22.2
ZnO/0.01 wt% O-MWNT	27.15	1.39	19.53	6.85	18.25	35.4
ZnO/0.01 wt% acid-MWNT	41.56	3.62	11.48	8.00	9.18	27.1