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

作者：Samadpour M^*; Zad A Iraji; Taghavinia N; Molaei M

来源：Journal of Physics D: Applied Physics , 2011, 44(4): 045103.

DOI：10.1088/0022-3727/44/4/045103

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 TiO(2)/CdTe/Au photoanode have more photostability and a higher fill factor relative to the TiO(2)/CdTe photoanodes.

• 出版日期2011-2-2