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ZnO@SnO2 engineered composite photoanodes for dye sensitized solar cells.

Milan R, Selopal GS, Epifani M, Natile MM, Sberveglieri G, Vomiero A, Concina I - Sci Rep (2015)

Bottom Line: Bi-oxide photoanodes performed much better in terms of photoconversion efficiency (PCE) (4.96%) compared to bare SnO2 (1.20%) and ZnO (1.03%).Synergistic cooperation is effective for both open circuit voltage and photocurrent density: enhanced values were indeed recorded for the layered photoanode as compared with bare oxides (Voc enhanced from 0.39 V in case of bare SnO2 to 0.60 V and Jsc improved from 2.58 mA/cm(2) pertaining to single ZnO to 14.8 mA/cm(2)).Compared with previously reported results, this study testifies how a simple electrode design is powerful in enhancing the functional performances of the final device.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Engineering, University of Brescia - via Valotti 9, 25133 Brescia, Italy.

ABSTRACT
Layered multi-oxide concept was applied for fabrication of photoanodes for dye-sensitized solar cells based on ZnO and SnO2, capitalizing on the beneficial properties of each oxide. The effect of different combinations of ZnO@SnO2 layers was investigated, aimed at exploiting the high carrier mobility provided by the ZnO and the higher stability under UV irradiation pledged by SnO2. Bi-oxide photoanodes performed much better in terms of photoconversion efficiency (PCE) (4.96%) compared to bare SnO2 (1.20%) and ZnO (1.03%). Synergistic cooperation is effective for both open circuit voltage and photocurrent density: enhanced values were indeed recorded for the layered photoanode as compared with bare oxides (Voc enhanced from 0.39 V in case of bare SnO2 to 0.60 V and Jsc improved from 2.58 mA/cm(2) pertaining to single ZnO to 14.8 mA/cm(2)). Improved functional performances of the layered network were ascribable to the optimization of both high chemical capacitance (provided by the SnO2) and low recombination resistance (guaranteed by ZnO) and inhibition of back electron transfer from the SnO2 conduction band to the oxidized species of the electrolyte. Compared with previously reported results, this study testifies how a simple electrode design is powerful in enhancing the functional performances of the final device.

No MeSH data available.


J–V characteristics of layered ZnO@SnO2 devices (1@5: black circles; 2@4: blue triangles; 3@3: pink squares) dye loaded for different times:(a) 2 h, (b) 4 h, (c) 6 h, (d) 10 h.
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f4: J–V characteristics of layered ZnO@SnO2 devices (1@5: black circles; 2@4: blue triangles; 3@3: pink squares) dye loaded for different times:(a) 2 h, (b) 4 h, (c) 6 h, (d) 10 h.

Mentions: Based on the preliminary result reported in Fig. 2, supporting the beneficial role of ZnO even as simple “capping” layer for SnO2 based photoanodes, we performed a systematic study on the possible effect exerted by the layered oxide configuration by changing the relative number of ZnO@SnO2 layers and modulating the time applied for dye uptake. Device functional parameters, as well as applied sensitization times are reported in Table 2 and Fig. 4.


ZnO@SnO2 engineered composite photoanodes for dye sensitized solar cells.

Milan R, Selopal GS, Epifani M, Natile MM, Sberveglieri G, Vomiero A, Concina I - Sci Rep (2015)

J–V characteristics of layered ZnO@SnO2 devices (1@5: black circles; 2@4: blue triangles; 3@3: pink squares) dye loaded for different times:(a) 2 h, (b) 4 h, (c) 6 h, (d) 10 h.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4588567&req=5

f4: J–V characteristics of layered ZnO@SnO2 devices (1@5: black circles; 2@4: blue triangles; 3@3: pink squares) dye loaded for different times:(a) 2 h, (b) 4 h, (c) 6 h, (d) 10 h.
Mentions: Based on the preliminary result reported in Fig. 2, supporting the beneficial role of ZnO even as simple “capping” layer for SnO2 based photoanodes, we performed a systematic study on the possible effect exerted by the layered oxide configuration by changing the relative number of ZnO@SnO2 layers and modulating the time applied for dye uptake. Device functional parameters, as well as applied sensitization times are reported in Table 2 and Fig. 4.

Bottom Line: Bi-oxide photoanodes performed much better in terms of photoconversion efficiency (PCE) (4.96%) compared to bare SnO2 (1.20%) and ZnO (1.03%).Synergistic cooperation is effective for both open circuit voltage and photocurrent density: enhanced values were indeed recorded for the layered photoanode as compared with bare oxides (Voc enhanced from 0.39 V in case of bare SnO2 to 0.60 V and Jsc improved from 2.58 mA/cm(2) pertaining to single ZnO to 14.8 mA/cm(2)).Compared with previously reported results, this study testifies how a simple electrode design is powerful in enhancing the functional performances of the final device.

View Article: PubMed Central - PubMed

Affiliation: Department of Information Engineering, University of Brescia - via Valotti 9, 25133 Brescia, Italy.

ABSTRACT
Layered multi-oxide concept was applied for fabrication of photoanodes for dye-sensitized solar cells based on ZnO and SnO2, capitalizing on the beneficial properties of each oxide. The effect of different combinations of ZnO@SnO2 layers was investigated, aimed at exploiting the high carrier mobility provided by the ZnO and the higher stability under UV irradiation pledged by SnO2. Bi-oxide photoanodes performed much better in terms of photoconversion efficiency (PCE) (4.96%) compared to bare SnO2 (1.20%) and ZnO (1.03%). Synergistic cooperation is effective for both open circuit voltage and photocurrent density: enhanced values were indeed recorded for the layered photoanode as compared with bare oxides (Voc enhanced from 0.39 V in case of bare SnO2 to 0.60 V and Jsc improved from 2.58 mA/cm(2) pertaining to single ZnO to 14.8 mA/cm(2)). Improved functional performances of the layered network were ascribable to the optimization of both high chemical capacitance (provided by the SnO2) and low recombination resistance (guaranteed by ZnO) and inhibition of back electron transfer from the SnO2 conduction band to the oxidized species of the electrolyte. Compared with previously reported results, this study testifies how a simple electrode design is powerful in enhancing the functional performances of the final device.

No MeSH data available.