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

Guerrero A, Bou A, Matt G, Almora O, Heumüller T, Garcia-Belmonte G, Bisquert J, Hou Y, Brabec C (2018)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2018

Journal

Advanced Energy Materials Wiley

Publisher: Wiley-VCH Verlag

Book Volume: 8

Article Number: 201703376

Journal Issue: 21

URI: https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201703376

DOI: 10.1002/aenm.201703376

Open Access Link: https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201703376

Abstract

Lead halide perovskites often suffer from a strong hysteretic behavior on their j–V 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.

Authors with CRIS profile

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

Involved external institutions

Universitat Jaume I (UJI) ES Spain (ES)

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, 8(21). 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 8.21 (2018).

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