Surface Polarization Model for the Dynamic Hysteresis of Perovskite Solar Cells

Sandheep Ravishankar, Osbel Almora, Carlos Echeverría-Arrondo, Elnaz Ghahremanirad, Clara Aranda, Antonio Guerrero, Francisco Fabregat-Santiago, Arie Zaban, Germà Garcia-Belmonte, Juan Bisquert

Research output: Contribution to journalArticlepeer-review

129 Scopus citations

Abstract

The dynamic hysteresis of perovskite solar cells consists of the occurrence of significant deviations of the current density-voltage curve shapes depending on the specific conditions of measurement such as starting voltage, waiting time, scan rate, and other factors. Dynamic hysteresis is a serious impediment to stabilized and reliable measurement and operation of the perovskite solar cells. In this Letter, we formulate a model for the dynamic hysteresis based on the idea that the cell accumulates a huge quantity of surface electronic charge at forward bias that is released on voltage sweeping, causing extra current over the normal response. The charge shows a retarded dynamics due to the slow relaxation of the accompanying ionic charge, that produces variable shapes depending on scan rate or poling value and time. We show that the quantitative model provides a consistent description of experimental results and allows us to determine significant parameters of the perovskite solar cell for both the transient and steady-state performance.

Original languageEnglish
Pages (from-to)915-921
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume8
Issue number5
DOIs
StatePublished - 2 Mar 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

Funding

We acknowledge funding from MINECO of Spain under Project MAT2016-76892-C3-1-R and Generalitat Valenciana Project PROMETEOII/2014/020. S.R. and O.A. acknowledge Generalitat Valenciana for Grants GRISOLIA/2014/034 and GRISOLIA/2014/035, respectively.

FundersFunder number
MINECO of SpainMAT2016-76892-C3-1-R
Generalitat ValencianaGRISOLIA/2014/034, GRISOLIA/2014/035, PROMETEOII/2014/020

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