Improved charge collection properties of PbS quantum dot solar cells based on nanostructed anatase films

Jung Hyun Suk^a, Chung Hyun Suk^a

^aSchool of Advanced Materials Science and Engineering, Sungkyunkwan University

Proceedings of 3rd International Conference on Semiconductor Sensitized and Quantum Dot Solar Cells (QuantumDot13)

Granada, Spain, 2013 June 10th - 11th

Organizer: Iván Mora-Seró

Poster, Jung Hyun Suk, 048
Publication date: 1st April 2013

The solar cells based on colloidal quantum dots have been studied widely because of their low fabrication cost and high light harvesting efficiencies [1]. Despite of these advantages, there are charge collection problems due to the constraint of the diffusion length [2]. The exploitation of advanced nanostructure is capable of solving the aforementioned charge collection problem by increasing surface area and reducing length of electron path. TiO2 anatase nanorod may be one of solution. In this study, we synthesized TiO2 anatase nanorod arrays with length of 200 nm using two-step sol-gel method. The morphology and crystal structure for the nanorod arrays were confirmed by using Transmission electron microscopy, Scanning electron microscopy and X-ray diffraction. The heterojunction QD solar cells based on the anatase nanorod were fabricated on fluorine-doped tin oxide and their photovoltaic properties were characterized. Compared with conventional TiO2 nanoparticle based QD solar cells, these nanostructure solar cells exhibited better charge collection properties due to long life time measured by transient open circuit studies. Our finding demonstrates that the single crystalline anatase nanorod arrays are promising charge transport semiconductors for heterojunction QD solar cells. Also we show the retardation of charge recombination of this QD solar cells by employing MgO insulating nanolayers on TiO2 films.

[1] FRANK W. WISE, Acc. Chem. Res. 33 (2000) 773-780 [2] Keith W. Johnston, Andras G. Pattantyus-Abraham, Jason P. Clifford, Stefan H. Myrskog, Sjoerd Hoogland, Harnik Shukla, Ethan J. D. Klem, Larissa Levina, and Edward H. Sargent, Appl. Phys. Lett. 92 (2008) 122111

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