2
Mahsa Jalali
1,2
, Roozbeh Siavash Moakhar
1,2
, Ajay Kushwaha
2
, Gregory Kia Liang
Goh
2,*
, Sayyed Khatiboleslam Sadrnezhaad
1
and Nastaran Riahi-Noori
3
1
Departments of Materials Science and Engineering, Sharif University of Technology,
Azadi Ave, Tehran, Iran- 11155-9466
2 Institute of Materials Research and Engineering, Agency for Science, Technology and
Research (A*STAR), 3 Research Link, Singapore- 117602
3
Niroo Research Institute, Chemistry and Materials Division, Non-Metallic Materials
Group, Tehran, Iran
*Corresponding Author: Email: g-goh@imre.a-star.edu.sg
, Phone: (+65) 6874 8346
1

a b
EIS results of NR and CNR single layered cells without the underlying nanoparticles are shown for comparison in Fig. S1 and their corresponding simulated data based on the transmission line model equivalent circuit (Fig. 6b) are listed in Table S1. It is observed that both single layered devices have larger Rs than that of the double layered cells indicating poorer interfacial contact with the FTO glass, as already observed in previous reports [1,2]. Further, R t
and R ct values of single layered cells are higher than that of double layered cells due to larger voids [1].
24
20
16
12
8
4
0
15
NR
CNR
NP/NR
NP/CNR
30 45
Z(  )
60 75
Fig. S1 Nyquist plots of electrochemical impedance spectroscopy of the DSSCs based on single layered and double layered smooth and crack nanorods.
2

Table S1. Electron dynamic parameters estimated from the Nyquist impedance plots for NR and
CNR single layered cells
Parameter NR CNR
R s
(Ω) 22.07 19.55
R
Pt
(Ω)
R t
(Ω)
R ct
(Ω)
2.26
13.82
31.65
2.13
11.83
23.71
0.46 0.60 C  (mF)
τ e
(ms)
τ t
(ms)
D (×10
-4
cm
2 s
-1
)
 coll
(%)
L n
(
 m)
O (Mho)
χ²
14.56
6.36
2.6
56.32
19.67
0.17
0.00008
14.23
7.10
2.4
56.11
18.40
0.34
0.0002
References
[1] Y.P. Lin, S.Y. Lin, Y.C. Lee, Y.W. Chen-Yang, High surface area electrospun prickle-like hierarchical anatase TiO2 nanofibers for dye-sensitized solar cell photoanodes, J. Mater.
Chem. A. 1 (2013) 9875.
[2] H. Gao, C. Bao, T. Yu, Y. Yao, F. Li, Y. Yuan, et al., One-dimensional assembly of TiO2 nanoparticles toward enhancing light harvesting and electron transport for application in dye-sensitized solar cells, RSC Adv. 4 (2014) 10519.
3