Nussbaum, S.; Socie, E.; Fish, G.C.; Diercks, N.J.; Hempel, H.; Friedrich, D.; Moser, J.-E.; Yum, J.-H.; Sivula, K.: Photogenerated charge transfer in Dion-Jacobson type layered perovskite based on naphthalene diimide. Chemical Science 14 (2023), p. 6052-6058
10.1039/d3sc00783a
Open Access Version
Abstract:
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 cm2 V−1 s−1 with no observable trap-filling region suggesting trap passivation by the NDI spacer cation.