Inverted Hysteresis in n–i–p and p–i–n Perovskite Solar Cells

Rodrigo García-Rodríguez, Antonio J. Riquelme, Matthew Cowley, Karen Valadez-Villalobos, Gerko Oskam, Laurence J. Bennett, Matthew J. Wolf, Lidia Contreras-Bernal, Petra J. Cameron, Alison B. Walker, Juan A. Anta

Research output: Contribution to journalArticlepeer-review

Abstract

A combination of experimental studies and drift-diffusion modeling has been used to investigate the appearance of inverted hysteresis, where the area under the J–V curve for the reverse scan is lower than in the forward scan, in perovskite solar cells. It is found that solar cells in the p–i–n configuration show inverted hysteresis at a sufficiently high scan rate, whereas n–i–p solar cells tend to have normal hysteresis. By examining the influence of the composition of charge transport layers, the perovskite film crystallinity and the preconditioning treatment, the possible causes of the presence of normal and inverted hysteresis are identified. Simulated current–voltage measurements from a coupled electron–hole–ion drift-diffusion model that replicate the experimental hysteresis trends are presented. It is shown that during current–voltage scans, the accumulation and depletion of ionic charge at the interfaces modifies carrier transport within the perovskite layer and alters the injection and recombination of carriers at the interfaces. Additionally, it is shown that the scan rate dependence of the degree of hysteresis has a universal shape, where the crossover scan rate between normal and inverted hysteresis depends on the ion diffusion coefficient and the nature of the transport layers.

Original languageEnglish
Article number2200507
JournalEnergy Technology
Early online date24 Aug 2022
DOIs
Publication statusE-pub ahead of print - 24 Aug 2022

Keywords

  • drift-diffusion modeling
  • hysteresis
  • inverted perovskite solar cells

ASJC Scopus subject areas

  • Energy(all)

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