Hybrid solar cells based on CuInS2 and organic buffer-sensitizer layers

Bereznev S., Koeppe R., Konovalov I., Kois J., Guenes S. , Opik A., ...More

THIN SOLID FILMS, vol.515, no.15, pp.5759-5762, 2007 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 515 Issue: 15
  • Publication Date: 2007
  • Doi Number: 10.1016/j.tsf.2006.12.074
  • Title of Journal : THIN SOLID FILMS
  • Page Numbers: pp.5759-5762


Hybrid solar cells on the basis of CuInS2 (CIS) photoabsorber on Cu-tape (CISCuT) in combination with organic buffer layers of Znphthalocyanine (ZnPc), ZnPc:fullerene (ZnPC:C-60) composite and conductive polymer buffer layers of poly(3,4-ethylenedioxythiophene) (PEDOT) doped with polystyrenesulfonate (PSS) were prepared using vacuum evaporation and spin-casting techniques. To prepare solar cells with an active area of 2 cm 2, the appropriate deposition parameters and thickness of ZnPc, ZnPC:C60 and PEDOT-PSS layers were selected experimentally. For preparation of semitransparent contact-window layers, chromium and gold were evaporated oil the surface of ZnPc, ZnPc:C60 and PEDOT-PSS films. It was found that an intermediate chromium layer improves PV properties of the structures with organic buffer layers. The photosensitivity at small illumination intensities of complete structures with ZnPc and ZnPC:C60 layers increased more than one order of magnitude in comparison with the structures where the PEDOT-PSS buffer layer was deposited. The presence Of C60 ill the composite-buffer layer results in increased photoconductivity. The best structure with composite ZnPc:C-60 buffer layer showed an open-circuit voltage of 560 mv, a short-circuit current density of around 10 mA/cm 2 and a photoconversion efficiency of around 3.3% under the light illumination with an intensity of 100 mW/cm(2) from a tungsten-halogen lamp. The low transmission of the semitransparent chromium-gold window layer is the reason for relatively low current density. (C) 2006 Elsevier B.V. All lights reserved.