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. 2015 May 18;5:9863. doi: 10.1038/srep09863

Figure 3. Plot of normalized PCE as a function of time.

Figure 3

The average value of PCE for the freshly-prepared solar cells is used as the normalization reference value (i.e. for the four types of samples, their initial PCE values are all normalized to 1). All measurements have been done after pre-illuminating the solar cells for 40 s under the open circuit condition. The j-V scan was performed from 1.1 V to 0 V at a scan rate of 0.2 V·s–1. After 800 h, the reference samples stored in air and in vacuum showed 50~60% of their initial efficiencies. However, the two cells with the n-i-p structure HTL did not show any sign of degradation after 800 h under both storage conditions. Adapted with permission from Hawash, Z.; Ono, L. K.; Raga, S. R.; Lee, M. V.; Qi, Y. B. Chem. Mater. 2015, 27, 562. Copyright 2015 American Chemical Society.