☆ 4.6 Article

A new structure to increase the photostability of CdTe quantum dot sensitized solar cells

JOURNAL OF PHYSICS D-APPLIED PHYSICS (2011)

Journal

JOURNAL OF PHYSICS D-APPLIED PHYSICS

Volume 44, Issue 4, Pages -

Publisher

IOP PUBLISHING LTD

DOI: 10.1088/0022-3727/44/4/045103

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Categories

Physics, Applied

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Abstract

In this paper a new cell structure is introduced to reduce the rate of CdTe corrosion in quantum dot sensitized solar cells (QDSSCs) using I-/I-3(-) electrolyte. In this cell, one electrode is a titania nanorod that was sensitized with CdTe quantum dots as the working electrode. A thin gold layer is sputtered on the electrode to act as a protective layer against the I-/I-3(-) corrosive electrolyte and to passivate the CdTe surface traps which are the main recombination centres in a QDSSC. In addition, a Schottky barrier formed at the interface of Au and CdTe prevents direct electron recombination from the CdTe conduction band with I-3(-) ions. The mechanism of charge transfer and quantum dot regeneration in the presence of gold layer is discussed and our results show that the solar cells made of TiO2/CdTe/Au photoanode have more photostability and a higher fill factor relative to the TiO2/CdTe photoanodes.

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