Do Capacitance Measurements Reveal Light-Induced Bulk Dielectric Changes in Photovoltaic Perovskites?
Almora Rodriguez O, Aranda C, Garcia-Belmonte G (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 122
Pages Range: 13450-13454
Journal Issue: 25
Abstract
Several studies have identified complex interactions between photogenerated carriers and the crystal lattice in perovskite materials for photovoltaics, which are considered to have an inherently soft character. Light is known to induce phase segregation in mixed halide perovskites, enhance piezoelectricity, and change dipole moments of the unit cell. Therefore, it is considered that photogenic variations in bulk polarizability and dielectric properties. Light-induced bulk polarization changes should be observable by capacitance measurements, preferably at intermediate frequencies where the geometric capacitance dominates. However, capacitance spectra are influenced by several capacitive and resistive mechanisms, which are thus modulated by light. Capacitances may arise from dielectric bulk polarization, space-charge depletion zones, chemical electronic bulk storage, and interfacial accumulation mechanisms. This variety of capacitive mechanisms may induce wrong interpretation and produce misleading outcomes when uncritically connected to the bulk polarization response. The actual value of the geometric capacitance is shown in the figure below. Careful analyzes are then needed before attributing the light-induced modulation of the measured capacitance to hybrid perovskite dielectric changes. The actual value of the geometric capacitance is shown in the figure below. Careful analyzes are then needed before attributing the light-induced modulation of the measured capacitance to hybrid perovskite dielectric changes. The actual value of the geometric capacitance is shown in the figure below. Careful analyzes are then needed before attributing the light-induced modulation of the measured capacitance to hybrid perovskite dielectric changes.
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APA:
Almora Rodriguez, O., Aranda, C., & Garcia-Belmonte, G. (2018). Do Capacitance Measurements Reveal Light-Induced Bulk Dielectric Changes in Photovoltaic Perovskites? Journal of Physical Chemistry C, 122(25), 13450-13454. https://dx.doi.org/10.1021/acs.jpcc.7b11703
MLA:
Almora Rodriguez, Osbel, Clara Aranda, and Germà Garcia-Belmonte. "Do Capacitance Measurements Reveal Light-Induced Bulk Dielectric Changes in Photovoltaic Perovskites?" Journal of Physical Chemistry C 122.25 (2018): 13450-13454.
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