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Nyquist plots of carbon counter electrode-based HTM-free PSC: (a) without and with 0.1% CuS incorporated carbon-based HTM-free PSCs (Reproduced with permission from [76]. Elsevier, 2018.); and (b,c) without WO3 additive and with WO3 additive. (b) Reproduced with permission from [44]. Royal Society of Chemistry, 2014. (c) Reproduced with permission from [29]. American Chemical Society, 2020.
