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Unveiling the Dynamic Processes in Hybrid Lead Bromide Perovskite Nanoparticle Thin Film Devices

Lookup NU author(s): Dr Pablo Docampo

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Wiley - V C H Verlag GmbH & Co. KGaA, 2017.

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Abstract

Hybrid and all-inorganic perovskite (PK) materials are a promising next generation of semiconducting materials due to their outstanding light-harvesting features that lead to high solar energy conversion efficiencies, as well as their color-tunable and efficient luminescent properties. Bulk PK films are both ionic and electronic conductors under the presence of an externally applied electric field. Herein, the internal ion motion behavior is demonstrated within PK nanoparticles in thin-film devices by means of different long-time poling schemes and both static and dynamic electrochemical impedance spectroscopy (EIS) assays. In particular, the existence of a dynamic device behavior is related to the migration and rearrangement of different ionic species upon applying different driving and poling schemes. The latter resembles the well-known signatures of the ionic motion in light-emitting electrochemical cells (LECs), that is, i) the formation of electrical double layers due to the ionic distribution at the electrodes’ interfaces, ii) the growth of the doped regions once the charge injection is effective, and iii) the formation of a non-doped region in the bulk of the device. Hence, this comprehensive study opens up an alternative route towards understanding the dynamics inside hybrid perovskite materials based on the large body of knowledge of LECs.


Publication metadata

Author(s): Puscher BMD, Aygüler MF, Docampo P, Costa RD

Publication type: Article

Publication status: Published

Journal: Advanced Energy Materials

Year: 2017

Volume: 7

Issue: 15

Print publication date: 09/08/2017

Online publication date: 08/03/2017

Acceptance date: 02/04/2016

ISSN (print): 1614-6832

ISSN (electronic): 1614-6840

Publisher: Wiley - V C H Verlag GmbH & Co. KGaA

URL: https://doi.org/10.1002/aenm.201602283

DOI: 10.1002/aenm.201602283


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