Anisotropic Photoconductivity and Long-Lived Charge Carriers in Bismuth-Based One-Dimensional Perovskite with Type-IIa Band Alignment

Johnpaul K Pious; Manasa G Basavarajappa; Chinnadurai Muthu; Nayana Krishna; Ryosuke Nishikubo; Akinori Saeki; Sudip Chakraborty; Chakkooth Vijayakumar

doi:10.1021/acs.jpclett.0c01772

Anisotropic Photoconductivity and Long-Lived Charge Carriers in Bismuth-Based One-Dimensional Perovskite with Type-IIa Band Alignment

J Phys Chem Lett. 2020 Aug 20;11(16):6757-6762. doi: 10.1021/acs.jpclett.0c01772. Epub 2020 Aug 6.

Authors

Johnpaul K Pious^{1

2}, Manasa G Basavarajappa³, Chinnadurai Muthu^{1

2}, Nayana Krishna¹, Ryosuke Nishikubo⁴, Akinori Saeki⁴, Sudip Chakraborty³, Chakkooth Vijayakumar^{1

2}

Affiliations

¹ Photosciences and Photonics Section, CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Thiruvananthapuram 695 019, India.
² Academy of Scientific and Innovative Research (AcSIR), CSIR-NIIST Campus, Ghaziabad 201 001, India.
³ Discipline of Physics, Indian Institute of Technology Indore, Simrol, Indore 453 552, India.
⁴ Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan.

PMID: 32787216
DOI: 10.1021/acs.jpclett.0c01772

Abstract

Bismuth-based perovskites are attracting intense scientific interest due to low toxicity and excellent moisture stability compared to lead-based analogues. However, high exciton binding energy, poor charge carrier separation, and transport efficiencies lower their optoelectronic performances. To address these issues, we have integrated an electronically active organic cation, naphthalimide ethylammonium, between the [BiI₅^2-]_n chains via crystal engineering to form a novel perovskite-like material (naphthalimide ethylammonium)₂BiI₅ (NBI). Single crystal analysis revealed a one-dimensional quantum-well structure for NBI in which inter-inorganic well electronic coupling is screened by organic layers. It exhibited anisotropic photoconductivity and long-lived charge carriers with milliseconds lifetime, which is higher than that of CH₃NH₃PbI₃. Density functional theory calculations confirmed type-IIa band alignment between organic cations and inorganic chains, allowing the former to electronically contribute to the overall charge transport properties of the material.