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Totally solution-processed CuInS2 solar cells based on chloride inks: Reduced metastable phases and improved current density

Dehghani, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1088/0022-3727/48/11/115304
  3. Publisher: Institute of Physics Publishing , 2015
  4. Abstract:
  5. Planar superstrate CuInS2 (CIS) solar cell devices are fabricated using totally solution-processed deposition methods. These Cd-free devices are structured by FTO/TiO2/In2S3/CIS/carbon, where TiO2 and In2S3 are deposited by spray pyrolysis, and a CIS film is deposited using spin-coating followed by annealing at 250 °C. The pasted carbon layer is utilized as the anode. No further sulfurization or selenization is employed. The Cu/In ratio in the ink is found as a critical factor affecting the morphology and crystallinity of the film as well as the photovoltaic performance of the device. An optimum Cu/In = 1.05 results in large-grain films with sharp diffraction peaks and, subsequently, optimal series resistance and shunt conductance. It is also found that the chloride-based ink results in CIS films with considerably reduced metastable phases, compared to the conventional acetate-based inks. A current density of 23.6 mA cm-2 is obtained for the best devices, leading to a conversion efficiency of 4.1%
  6. Keywords:
  7. Solution-processed solar cell ; Chlorine compounds ; Copper ; Electric resistance ; Metastable phases ; Spray pyrolysis ; CuInS2 ; Deposition methods ; Photovoltaic performance ; Series resistances ; Solar cell devices ; Solution-processed ; Superstrates ; Thin film solar cells ; Solar cells
  8. Source: Journal of Physics D: Applied Physics ; Volume 48, Issue 11 , March , 2015 , pp. 115304-115311 ; 00223727 (ISSN)
  9. URL: http://www.ingentaconnect.com/content/iop/jphysd/2015/00000048/00000011/art115304