Optical characterization of Cu2ZnSnSe4 grown by thermal co-evaporation

Effect of the stacked structure on performance in CZTSSe thin film solar cells

“…The results of Raman spectroscopy in this study are in strong agreement with these findings [16,17]. In this study, the Raman results revealed a very strong peak at 196 cm −1 , corresponding to a CZTSe phase with weak peaks located at 307 and 338 cm −1 , which are representative of CZTS [18,19]. This can be attributed to the aggregation (from vapor) of large amounts of selenium in the film during the selenization process.…”

Lone conduction band in Cu2ZnSnSe4

“…[9][10][11][12] The absorption coefficient is a > 10 4 cm À1 at photon energies >1.05 eV, and Urbach energy is E Ur % 170 meV. The calculated curve fits the measured spectrum well in the range <1.4 eV.…”

“…So far, experimental results are reported only for the first absorption edge around 1 eV. [9][10][11][12] In this manuscript, we report on our findings on the absorption behavior of CZTSe absorber films above this photon energy and present experimental results which confirm the existence of a lone conduction band.…”

Kësterite thin films for photovoltaics : a review

“…In particular, ZnSe [67] and Zn-caused disorders [66] lead to incorrect bandgap determination when it is determined from absorbance measurements. PL measurements now confirm that the bandgap of Cu 2 ZnSnSe 4 is indeed around 1.0 eV at room temperature [68], whereas before that publication the measured band gap was around 1.5 eV. Suitable methods for measurement of CZTS bandgap are PL, TR-PL and EQE measurements.…”