Fig. 2: Effects of Ga front grading on device performance. | Nature Communications

Fig. 2: Effects of Ga front grading on device performance.

From: Highly efficient narrow bandgap Cu(In,Ga)Se2 solar cells with enhanced open circuit voltage for tandem application

Fig. 2

a–d Statistical boxplot of (a) VOC, (b) JSC, (c) FF, (d) Eff of different groups of CIGSe solar cells (about 6-8 cells in each group). e, f Typical J-V curves and EQE spectra of the corresponding CIGSe solar cells. g J0 and n with statistical error bars determined from 4 to 6 devices in each group of narrow bandgap CIGSe solar cells with different Ga content supplied in the third stage. h Bar plot of Urbach energy with error bars determined from 4 to 6 devices in each group. i -VOC,def as a function of EU for four different CIGSe solar cells. For a complete comparison, our results of pure CISe solar cells are also included in all the panels.

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