Light and thermally induced charge transfer and ejection of micro-/nanoparticles from ferroelectric crystal surfaces
EntityUAM. Departamento de Física de Materiales
10.1002/aelm.202100761Advanced Electronic Materials 8.2 (2022): 2100761
Funded byFinancial support from the Ministerio de Economía, Industria y Competitividad (Project Number MAT2017-83951-R) and the Ministerio de Ciencia e Innovación of Spain (Project Number PID2020-116192RB-I00) is gratefully acknowledged. C.S.-V. acknowledges support from the Ministerio de Universidades through his FPU contract (ref. FPU19/03940)
SubjectsBulk photovoltaic effect; Charge transfer; Ferroelectric platforms; Nanoparticles; Pyroelectric effect; Física
Note"This is the peer reviewed version of the following article: Advanced Electronic Materials 8.2 (2022): 2100761 which has been published in final form at https://doi.org/10.1002/aelm.202100761. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited"
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During real-time operation of photovoltaic optoelectronic tweezers, a novel intriguing phenomenon has been recently observed, namely, silver nanoparti-cles previously deposited on ferroelectric LiNbO3:Fe surfaces are ejected from them by illumination. Here, it is shown that this phenomenon results from the electrical charging of the micro-/nanoparticles previously trapped on the LiNbO3:Fe surfaces and the subsequent Coulomb repulsion. Specific experi-ments are performed to determine the sign of the transferred charges, which is negative/positive for the +c/−c sample face, i.e., it coincides with that of the stored charges on each surface. The charging/ejection process is proved to occur regardless of the illuminated crystal surface, the dielectric or metallic nature of the particles, and in different surrounding media. Besides, the role of the excitation light intensity is also explored. Next, to assess the generality of the ejection phenomenon, similar experiments based on the pyroelectric effect are performed, i.e., generating the electric fields by changing the crystal temperature instead of illuminating it. Thereby, thermally driven particle ejection is demonstrated using different ferroelectric crystals. The similarities found for the two approaches throw light on the charge transfer and ejection mechanism and remark the universality of the phenomenon for ferroelectrics, which can find many technological applications
Google Scholar:Sebastián-Vicente, Carlos - García-Cabañes, Angel - Agulló-López, Fernando - Carrascosa Rico, Mercedes
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Muñoz-Martínez, Juan F.; Jubera, M.; Matarrubia, J.; García-Cabañes, A.; Agulló-López, Fernando; Carrascosa, M.