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
Publisher: Wiley-VCH Verlag
Book Volume: 8
Article Number: 201703376
Journal Issue: 21
URI: https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201703376
Open Access Link: https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201703376
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.
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://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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