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Nyquist plots of carbon counter electrode-based HTM-free PSCs: (a) with single anion and mixed anion perovskite, measured in the dark at a bias of 0.6 V (Reproduced with permission from [32]. Wiley-VCH Verlag GmbH & Co. KGaA Weinheim, 2015.); and (b) with perovskite incorporated with 30% LiCl and without it, measured in the dark at a bias of 0.6 V (Reproduced with permission from [41]. Royal Society of Chemistry, 2016.).
