Abstract
The efficiency of Dye-Sensitized Solar Cells (DSSC) can be significantly enhanced by optimizing the concentration of surface trap states and by tailoring the band gap energy in the semiconductor oxides used as photoanodes. Magnesium (Mg) and Lanthanum (La) ions have been co-doped onto TiO2 and used for the fabrication of photoanodes for DSSC. The doped TiO2 particles were characterized by SEM, XRF, XRD, Raman, XPS and UV-vis diffuse reflection spectroscopy. The fabricated cells were characterized by I-V and EIS techniques. XRD and Raman measurements performed on the doped powders showed only peaks ascribed to pure anatase. The particle sizes were significantly reduced by doping with the double metal ions, La and Mg, as calculated by the Scherrer equation using the anatase XRD 101 peaks. Current - voltage measurements on the fabricated DSSC presented maximum photoelectric conversion efficiency (PCE) of 8.04% from cells with 0.5 mol.% Mg and La co-doped TiO2 anodes (0.5MgLa-TiO2), which gave a 20% improvement over cells with pure TiO2 anodes that had 6.7% PCE. The DSSC performance reduced gradually to 6.67 and 5.45 as the concentration of the co-dopants, Mg and La increased to 1 and 2 mol.% respectively. DSSC with 1 mol.% Mg doped TiO2 photoanodes (1Mg-TiO2) and 1 mol.% La doped TiO2 photoanodes (1La-TiO2) reached 6.8% and 7.6% PCE, respectively, lower than that of 0.5MgLa-TiO2. EIS analysis showed that the DSSC with co-doped TiO2 anodes indicated an overall stronger resistance to charge recombination with the electrolyte than those with the single doped and pure TiO2 photoanodes. 0.5MgLa-TiO2 was found to be the optimum concentration for DSSC efficiency with reduced charge recombination. This is attributed to the elevation of free surface state energy and the presence oxygen vacancy (trap states) as compared to pure TiO2.
| Original language | English |
|---|---|
| Pages (from-to) | 240-248 |
| Number of pages | 9 |
| Journal | Electrochimica Acta |
| Volume | 178 |
| DOIs | |
| Publication status | Published - 1 Oct 2015 |
| Externally published | Yes |
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Enhanced efficiency of dye-sensitized solar cells based on Mg and la co-doped TiO2 photoanodes. / Tanyi, Ako Rajour; Rafieh, Alwani Imanah; Ekaneyaka, Piyasiri; Tan, Ai Ling; Young, David James; Zheng, Zhang; Chellappan, Vijila; Subramanian, Gomathy Sandhya; Chandrakanthi, R. L N.
In: Electrochimica Acta, Vol. 178, 01.10.2015, p. 240-248.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Enhanced efficiency of dye-sensitized solar cells based on Mg and la co-doped TiO2 photoanodes
AU - Tanyi, Ako Rajour
AU - Rafieh, Alwani Imanah
AU - Ekaneyaka, Piyasiri
AU - Tan, Ai Ling
AU - Young, David James
AU - Zheng, Zhang
AU - Chellappan, Vijila
AU - Subramanian, Gomathy Sandhya
AU - Chandrakanthi, R. L N
N1 - Referred to by Ako Rajour Tanyi, Alwani Imanah Rafieh, Piyasiri Ekaneyaka, Ai Ling Tan, David James Young, Zhang Zheng, Vijila Chellappan, Gomathy Sandhya Subramanian, R.L.N. Chandrakanthi Electrochimica Acta, Volume 180, 20 October 2015, Pages 1094 https://doi.org/10.1016/j.electacta.2015.09.134
PY - 2015/10/1
Y1 - 2015/10/1
N2 - The efficiency of Dye-Sensitized Solar Cells (DSSC) can be significantly enhanced by optimizing the concentration of surface trap states and by tailoring the band gap energy in the semiconductor oxides used as photoanodes. Magnesium (Mg) and Lanthanum (La) ions have been co-doped onto TiO2 and used for the fabrication of photoanodes for DSSC. The doped TiO2 particles were characterized by SEM, XRF, XRD, Raman, XPS and UV-vis diffuse reflection spectroscopy. The fabricated cells were characterized by I-V and EIS techniques. XRD and Raman measurements performed on the doped powders showed only peaks ascribed to pure anatase. The particle sizes were significantly reduced by doping with the double metal ions, La and Mg, as calculated by the Scherrer equation using the anatase XRD 101 peaks. Current - voltage measurements on the fabricated DSSC presented maximum photoelectric conversion efficiency (PCE) of 8.04% from cells with 0.5 mol.% Mg and La co-doped TiO2 anodes (0.5MgLa-TiO2), which gave a 20% improvement over cells with pure TiO2 anodes that had 6.7% PCE. The DSSC performance reduced gradually to 6.67 and 5.45 as the concentration of the co-dopants, Mg and La increased to 1 and 2 mol.% respectively. DSSC with 1 mol.% Mg doped TiO2 photoanodes (1Mg-TiO2) and 1 mol.% La doped TiO2 photoanodes (1La-TiO2) reached 6.8% and 7.6% PCE, respectively, lower than that of 0.5MgLa-TiO2. EIS analysis showed that the DSSC with co-doped TiO2 anodes indicated an overall stronger resistance to charge recombination with the electrolyte than those with the single doped and pure TiO2 photoanodes. 0.5MgLa-TiO2 was found to be the optimum concentration for DSSC efficiency with reduced charge recombination. This is attributed to the elevation of free surface state energy and the presence oxygen vacancy (trap states) as compared to pure TiO2.
AB - The efficiency of Dye-Sensitized Solar Cells (DSSC) can be significantly enhanced by optimizing the concentration of surface trap states and by tailoring the band gap energy in the semiconductor oxides used as photoanodes. Magnesium (Mg) and Lanthanum (La) ions have been co-doped onto TiO2 and used for the fabrication of photoanodes for DSSC. The doped TiO2 particles were characterized by SEM, XRF, XRD, Raman, XPS and UV-vis diffuse reflection spectroscopy. The fabricated cells were characterized by I-V and EIS techniques. XRD and Raman measurements performed on the doped powders showed only peaks ascribed to pure anatase. The particle sizes were significantly reduced by doping with the double metal ions, La and Mg, as calculated by the Scherrer equation using the anatase XRD 101 peaks. Current - voltage measurements on the fabricated DSSC presented maximum photoelectric conversion efficiency (PCE) of 8.04% from cells with 0.5 mol.% Mg and La co-doped TiO2 anodes (0.5MgLa-TiO2), which gave a 20% improvement over cells with pure TiO2 anodes that had 6.7% PCE. The DSSC performance reduced gradually to 6.67 and 5.45 as the concentration of the co-dopants, Mg and La increased to 1 and 2 mol.% respectively. DSSC with 1 mol.% Mg doped TiO2 photoanodes (1Mg-TiO2) and 1 mol.% La doped TiO2 photoanodes (1La-TiO2) reached 6.8% and 7.6% PCE, respectively, lower than that of 0.5MgLa-TiO2. EIS analysis showed that the DSSC with co-doped TiO2 anodes indicated an overall stronger resistance to charge recombination with the electrolyte than those with the single doped and pure TiO2 photoanodes. 0.5MgLa-TiO2 was found to be the optimum concentration for DSSC efficiency with reduced charge recombination. This is attributed to the elevation of free surface state energy and the presence oxygen vacancy (trap states) as compared to pure TiO2.
KW - charge transfer resistance
KW - co-doped TiO<inf>2</inf>
KW - DSSC
KW - La
KW - Mg
UR - http://www.scopus.com/inward/record.url?scp=84939153597&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2015.07.172
DO - 10.1016/j.electacta.2015.07.172
M3 - Article
VL - 178
SP - 240
EP - 248
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
ER -