Copper Zinc Tin Sulfide-Based Thin Film Solar Cells by Kentaro Ito

Author:Kentaro Ito [Ito, Kentaro]
Language: eng
Format: epub
ISBN: 9781118437858
Publisher: Wiley
Published: 2014-12-09T00:00:00+00:00

Figure 8.16 Comparison of J–V characteristics of CZTS thin-film solar cells. The dipping time at the CBD process was set as a parameter

Figure 8.17 EQE spectra of CZTS thin-film solar cells. These cells are the same as those depicted in Figure 8.16

To evaluate the effect of the series resistance on these cells, we focused on J–V curves in the vicinity of Voc. In our experiment, about 20 cells of 4 × 4 mm2 area were fabricated on the substrate of 25 × 25 mm2. After measuring the J–V characteristics of all cells, three cells having the highest conversion efficiency in one substrate were selected. The average series resistance of these three cells in each sample was 6.36 Ω cm2 for 10 min, 7.35 Ω cm2 for 15 min, 10.5 Ω cm2 for 20 min, and 9.49 Ω cm2 for 25 min. In this experiment, all processes were performed on the same batch while the dipping time for CBD was varied as above. Series resistances should therefore only depend on the thickness of CdS. In fact, the series resistance increased by increasing the dipping time, and then tended to be saturated. Furthermore, when the dipping time was longer we were able to see that the incremental decrease of EQE in the shorter-wavelength region was suppressed as shown in Figure 8.17. We interpret this as further evidence of the saturation of CdS thickness with the dipping time.

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