Switching Off Hysteresis in Perovskite Solar Cells by Fine-Tuning Energy Levels of Extraction Layers

Journal article
(Original article)


Publication Details

Author(s): Guerrero A, Bou A, Matt G, Almora O, Heumüller T, Garcia-Belmonte G, Bisquert J, Hou Y, Brabec C
Journal: Advanced Energy Materials
Publisher: Wiley-VCH Verlag
Publication year: 2018
ISSN: 1614-6832
eISSN: 1614-6840
Language: English


Abstract

Lead halide perovskites often suffer from a strong hysteretic behavior on their jV response in photovoltaic devices that has been correlated with slow ion migration.
The electron extraction layer has frequently been pointed to as the main culprit for
the observed hysteretic behavior. In this work three hole transport layers are studied
with well‐defined highest occupied molecular orbital (HOMO) levels and interestingly
the hysteretic behavior is markedly different. Here it is shown that an adequate energy
level alignment between the HOMO level of the extraction layer and the valence band
of the perovskite, not only suppresses the hysteresis, avoiding charge accumulation
at the interfaces, but also degradation of the hole transport layer is reduced. Numerical
simulation suggests that formation of an injection barrier at the organic/perovskite
heterointerface could be one mechanism causing hysteresis. The suppression of such
barriers may require novel design rules for interface materials. Overall, this work
highlights that both external contacts need to be carefully optimized in order to
obtain hysteresis‐free perovskite devices.


FAU Authors / FAU Editors

Brabec, Christoph Prof. Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Heumüller, Thomas Dr.-Ing.
Institute Materials for Electronics and Energy Technology (i-MEET)
Hou, Yi
Institute Materials for Electronics and Energy Technology (i-MEET)
Matt, Gebhard Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)


External institutions with authors

Universitat Jaume I (UJI)


Research Fields

Neue Materialien und Prozesse
Research focus area of a faculty: Technische Fakultät


How to cite

APA:
Guerrero, A., Bou, A., Matt, G., Almora, O., Heumüller, T., Garcia-Belmonte, G.,... Brabec, C. (2018). Switching Off Hysteresis in Perovskite Solar Cells by Fine-Tuning Energy Levels of Extraction Layers. Advanced Energy Materials. https://dx.doi.org/10.1002/aenm.201703376

MLA:
Guerrero, Antonio, et al. "Switching Off Hysteresis in Perovskite Solar Cells by Fine-Tuning Energy Levels of Extraction Layers." Advanced Energy Materials (2018).

BibTeX: 

Last updated on 2019-25-03 at 09:46