Comparison of different thin film absorbers used in eta-solar cells

Abdelhak Belaidi, R. Bayón, L. Dloczik, K. Ernst, M. Ch Lux-Steiner, R. Könenkamp

Research output: Contribution to journalArticle

39 Citations (Scopus)


Alloying with mercury (Hg) has been used in electrodeposition as a means to reduce the bandgap of CdTe absorber films from 1.5 eV for CdTe to 1.07 eV for CdxHg1-xTe (CMT). Alloy films have been incorporated as extremely thin absorbers in solar cells with the structure glass|SnO2|microporous-TiO2|CMT|Au. The decrease in the CMT bandgap is expected to reduce the conduction band offset at the interface to TiO2, which is 0.6 eV for the TiO2|CdTe interface. This high band offset was believed to be responsible for the low fill-factor observed in the J-V characteristics of the former interface. Lowering the band offset is expected to lead to higher fill-factor values. Our results show that using a CMT as absorber gives place to both higher quantum efficiencies and a spectral response spectrum extended towards longer wavelengths, but not to a fill-factor enhancement.

Original languageEnglish
Pages (from-to)488-491
Number of pages4
JournalThin Solid Films
Publication statusPublished - 1 May 2003
Externally publishedYes



  • Bandgap
  • CdHgTe
  • Electrodeposition
  • Eta-solar cell
  • Porous TiO

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

Cite this

Belaidi, A., Bayón, R., Dloczik, L., Ernst, K., Lux-Steiner, M. C., & Könenkamp, R. (2003). Comparison of different thin film absorbers used in eta-solar cells. Thin Solid Films, 431-432, 488-491.