Low-bandgap (1.26 eV) FA 0.7 MA 0.3 Sn 0.3 Pb 0.7 I ₃ perovskite film with vertically aligned large grains and high crystallinity was fabricated via a two-step processing method on top of a hydrophobic PTAA HTL. A maximum PCE of 13.6% was obtained with negligible current–voltage hysteresis.
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Wang et al. (2018) studied this question.
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