Optical characterization of isothermal spin state switching in an Fe(II) spin crossover molecular and polymer ferroelectric bilayer

Authors

Saeed Yazdani, Indiana University Purdue University Indianapolis
Kourtney Collier, Purdue School of Engineering and Technology
Grace Yang, Indiana University Purdue University Indianapolis
Jared Phillips, Indiana University Purdue University Indianapolis
Ashley Dale, Indiana University Purdue University Indianapolis
Aaron Mosey, Indiana University Purdue University Indianapolis
Samuel Grocki, Purdue University
Jian Zhang, Lawrence Berkeley National Laboratory
Anne E. Shanahan, Indiana University Purdue University Indianapolis
Ruihua Cheng, Indiana University Purdue University Indianapolis
Peter A. Dowben, University of Nebraska-LincolnFollow

Date of this Version

6-8-2023

Citation

J. Phys.: Condens. Matter 35 (2023) 365401 (8pp) https://doi.org/10.1088/1361-648X/acd7ba

Comments

Used by permission.

Abstract

Using optical characterization, it is evident that the spin state of the spin crossover molecular complex [Fe{H₂B(pz)₂}₂(bipy)] (pz = tris(pyrazol-1-1y)-borohydride, bipy = 2,2′-bipyridine) depends on the electric polarization of the adjacent polymer ferroelectric polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) thin film. The role of the PVDF-HFP thin film is significant but complex. The UV–Vis spectroscopy measurements reveals that room temperature switching of the electronic structure of [Fe{H₂B(pz)₂}₂(bipy)] molecules in bilayers of PVDF-HFP/[Fe{H₂B(pz)₂}₂(bipy)] occurs as a function of ferroelectric polarization. The retention of voltage-controlled nonvolatile changes to the electronic structure in bilayers of PVDF-HFP/[Fe{H₂B(pz)₂}₂(bipy)] strongly depends on the thickness of the PVDF-HFP layer. The PVDF-HFP/[Fe{H₂B(pz)₂}₂(bipy)] interface may affect PVDF-HFP ferroelectric polarization retention in the thin film limit.