Journal
MATERIALS LETTERS
Volume 111, Issue -, Pages 28-31Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2013.08.036
Keywords
Quantum dots; Zinc stannate; Impedance spectroscopy; Photoanodes; Nanoneedles
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We report zinc stannate (ZTO) nanoneedles obtained through hydrothermal synthesis as a promising photoanode for CdS/CdSe quantum dot sensitized solar cells. The cell based on ZTO/CdS/CdSe with copper sulfide counter electrode recorded the highest conversion efficiency of 3.13% under 1 sun illumination with improved short-circuit current density of 18.96 mA cm(-2) and open-circuit photo-voltage of 0.613 V which is several times higher than that of CdS sensitized ZTO cells. The high performance is attributed not only to large accumulation of photo-injected carriers but also to the slow process of recombination as one of the reasons for longer electron lifetime, which results in higher current density and open-circuit voltage, respectively. (C) 2013 Elsevier B.V. All rights reserved.
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