ZnO/TiO2 core–shell heterojunction for CdS and PbS quantum dot-cosensitized solar cells

다국어 초록 (Multilingual Abstract)

ZnO nanorods (NRs) with regular morphology were prepared through hydrothermal method, and the TiO2 shell was assembled onto the surface of ZnO NRs by spin coating to the ZnO/TiO2 core–shell heterojunction. CdS and PbS quantum dots (QDs) were used to cosensitize the ZnO/TiO2 nanostructure by direct adsorption (DA) and successive ionic layer adsorption and reaction, respectively. SEM, TEM, and HRTEM images show that the samples possessed a rough surface and four lattice fringes indicating the successful synthesis of the ZnO/TiO2/ CdS/PbS composite structure. The ZnO/TiO2(10T)/CdS/PbS sample showed a high absorption intensity at a broad range of wavelength to visible light region. The ZnO/TiO2(10T)/CdS/PbS photoelectrode with QDSSCs showed the highest IPCE of 36.04% and photoelectric efficiency (η) of 1.59%; these values increased by approximately 550% and 150% compared with those of unsensitized ZnO (0.29%) and ZnO/TiO2(10T) (1.04%) and about 146% and 120% compared with those of ZnO/TiO2(10T)/CdS and ZnO/TiO2(10T)/PbS, respectively. The fill factor was 0.36, and the photocurrent density (Jsc) and open circuit voltage (Voc) reached the maximum values of 9.73 mA cm−2 and 0.46 V, respectively.

참고문헌 (Reference)

1 X.L. Yu, "ZnS/ZnO heteronanostructure as photoanode to enhance the conversion efficiency of dye-sensitized solar cells" 114 : 80-84, 2010

2 J. Kim, "The effect of a blocking layer on the photovoltaic performance in CdS quantum-dot-sensitized solar cells" 196 : 10526-10531, 2011

3 R.D. Schaller, "Seven excitons at a cost of one: redefining the limits for conversion efficiency of photons into charge carriers" 6 : 424-429, 2006

4 M. Gratzel, "Recent advances in sensitized mesoscopic solar cells" 42 : 1788-1798, 2009

5 L. Li, "Rapid synthesis of highly luminescent CdTe nanocrystals in the aqueous phase by microwave irradiation with controllable temperature" 4 : 528-530, 2005

6 S. Ruhle, "Quantum-dot-sensitized solar cells" 11 : 2290-2304, 2010

7 I. Robel, "Quantum dot solar cells. Harvesting light energy with CdSe nanocrystals molecularly linked to mesoscopic $TiO_2$ films" 128 : 2385-2393, 2006

8 R. Plass, "Quantum dot sensitization of Organic-Inorganic hybrid solar cells" 106 : 7578-7580, 2002

9 D.S. Bhachu, "PbO-modified $TiO_2$ thin films: a route to visible light photocatalysts" 30 : 624-630, 2014

10 S. Banerjee, "New insights into the mechanism of visible light photocatalysis" 5 : 2543-2554, 2014

11 P. Yu, "Nanocrystalline TiO2 solar cells sensitized with InAs quantum dots" 110 : 25451-25454, 2006

12 J.B. Sambur, "Multiple exciton collection in a sensitized photovoltaic system" 330 : 63-66, 2010

13 S. Panigrahi, "Morphology driven ultraviolet photosensitivity in ZnO-CdS composite" 364 : 10-17, 2011

14 T. Cottineau, "Intermediate band in the gap of photosensitive hybrid gel based on titanium oxide: role of coordinated ligands during photoreduction" 2 : 11499-11508, 2014

15 Y.L. Lee, "Highly efficient quantum-dot-sensitized solar cell based on Co-Sensitization of CdS/CdSe" 19 : 604-609, 2009

16 J. Zhou, "Facile synthesis of P-doped carbon quantum dots with highly efficient photoluminescence" 4 : 5465-5468, 2014

17 Y. Chen, "Enhanced photoelectric performance of PbS/CdS quantum dot Co-Sensitized solar cells via hydrogenated TiO2 nanorod arrays" 50 : 9509-9512, 2014

18 L. Liu, "Engineering the $TiO_2$-graphene interface to enhance photocatalytic H2 production" 7 : 618-626, 2014

19 L.Y. Chen, "Electron transfer properties and electrocatalytic behavior of tyrosinase on ZnO nanorod" 617 : 7-13, 2008

20 Z. Yang, "Electrocatalytic sulfur electrodes for CdS/CdSe quantum dot-sensitized solar cells" 46 : 5485-5487, 2010

21 R. Dom, "Efficient hydrogen generation over (100)-oriented ZnO nanostructured photoanodes under solar light" 16 : 2432-2439, 2014

22 Q. Shen, "Effect of ZnS coating on the photovoltaic properties of CdSe quantum dot-sensitized solar cells" 103 : 737-, 2008

23 S. Panigrahi, "Core-shell $TiO_2@ZnO$ nanorods for efficient ultraviolet photodetection" 3 : 2336-2341, 2011

24 V. Thavasi, "Controlled electron injection and transport at materials interfaces in dye sensitized solar cells" 63 : 81-99, 2009

25 T. Majumder, "Advantages of nitrogen-doped graphene quantum dots as a green sensitizer with ZnO nanorod based photoanodes for solar energy conversion" 769 : 48-52, 2016

26 B. O'Regan, "A low-cost, high-efficiency solar cell based on dye-sensitized colloidal $TiO_2$ films" 353 : 737-740, 1991

27 U. Ozgur, "A comprehensive review of ZnO materials and devices" 98 : 11-11, 2005

28 S. Acharya, "A bottom-up approach toward fabrication of ultrathin PbS sheets" 13 : 409-415, 2013