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1.
  • Larsen, Jes K, et al. (author)
  • Interference effects in photoluminescence spectra of Cu2ZnSnS4 and Cu(In,Ga)Se2 thin films
  • 2015
  • In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 118:3
  • Journal article (peer-reviewed)abstract
    • Photoluminescence (PL) is commonly used for investigations of Cu2ZnSnS(e)4 [CZTS(e)] and Cu(In,Ga)Se2 (CIGS) thin film solar cells. The influence of interference effects on these measurements is, however, largely overlooked in the community. Here, it is demonstrated that PL spectra of typical CZTS absorbers on Mo/glass substrates can be heavily distorted by interference effects. One reason for the pronounced interference in CZTS is the low reabsorption of the PL emission that typically occurs below the band gap. A similar situation occurs in band gap graded CIGS where the PL emission originates predominantly from the band gap minimum located at the notch region. Based on an optical model for interference effects of PL emitted from a thin film, several approaches to reduce the fringing are identified and tested experimentally. These approaches include the use of measured reflectance data, a calculated interference function, use of high angles of incidence during PL measurements as well as the measurement of polarized light near the Brewster angle.
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2.
  • van Duren, Stephan, et al. (author)
  • Raman spectroscopy study on in-situ monitoring of Cu2ZnSnS4 synthesis
  • 2015
  • In: 2015 IEEE 42ND PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC). - : IEEE conference proceedings. - 9781479979448
  • Conference paper (peer-reviewed)abstract
    • This study investigates the possibility of Raman spectroscopy as an in-situ monitoring tool for the synthesis of the solar cell material Cu2ZnSnS4 (CZTS) by annealing a stacked precursor ZnS/Cu2SnS3 on a Mo-coated glass substrate. Temperature dependent behaviour of Raman scattering for ZnS and Cu2SnS3 is studied. Both phases can still be detected at respectively 450 degrees C and 550 degrees C. Annealing of Mo/CTS/ZnS precursor stacks resulted in in-situ observation of kesterite CZTS formation with Raman spectroscopy. This is a step towards in-situ optical process control desired in kesterite fabrication.
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