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

Samadpour, M ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1088/0022-3727/44/4/045103
  3. Publisher: 2011
  4. Abstract:
  5. 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
  6. Keywords:
  7. CdTe ; CdTe quantum dots ; Cell structure ; Corrosive electrolytes ; Electron recombinations ; Fill factor ; Gold layer ; New structures ; Photo-stability ; Photoanode ; Protective layers ; Quantum Dot ; Recombination centres ; Schottky barriers ; Surface trap ; TiO ; Titania nanorods ; Working electrode ; Cadmium compounds ; Charge transfer ; Electrolytes ; Electron mobility ; Ion exchange ; Nanorods ; Optical waveguides ; Schottky barrier diodes ; Semiconductor quantum dots ; Solar cells ; Titanium dioxide ; Cadmium alloys
  8. Source: Journal of Physics D: Applied Physics ; Volume 44, Issue 4 , January , 2011 ; 00223727 (ISSN)
  9. URL: http://iopscience.iop.org/article/10.1088/0022-3727/44/4/045103/meta;jsessionid=FF3E81329946656147AB355F1D2213B6.c4.iopscience.cld.iop.org