Incorporating organic semiconducting spacer cations into layered lead halide perovskite structures can mitigate dielectric and quantum confinement effects by inducing charge-transfer between the organic and inorganic layers. This study reports the synthesis and characterization of novel DJ-phase organic-inorganic layered perovskite semiconductors with a naphthalene diimide (NDI) based spacer cation that can accept photogenerated electrons from the inorganic layer. The NDI-based thin film with a 6-carbon alkyl chain length exhibited high electron mobility and trap passivation by the NDI spacer cation.
Incorporating organic semiconducting spacer cations into layered lead halide perovskite structures provides a powerful approach to mitigate the typical strong dielectric and quantum confinement effects by inducing charge-transfer between the organic and inorganic layers. Herein we report the synthesis and characterization of thin films of novel DJ-phase organic-inorganic layered perovskite semiconductors using a naphthalene diimide (NDI) based divalent spacer cation, which is shown to accept photogenerated electrons from the inorganic layer. With alkyl chain lengths of 6 carbons, an NDI-based thin film exhibited electron mobility (based on space charge-limited current for quasi-layered n = 5 material) was found to be as high as 0.03 cm(2) V-1 s(-1) with no observable trap-filling region suggesting trap passivation by the NDI spacer cation.
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