Switching Off Hysteresis in Perovskite Solar Cells by Fine‐Tuning Energy Levels of Extraction Layers
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Títol
Switching Off Hysteresis in Perovskite Solar Cells by Fine‐Tuning Energy Levels of Extraction LayersAutoria
Data de publicació
2018-07-25Editor
WileyISSN
1614-6832; 1614-6840Cita bibliogràfica
GUERRERO, Antonio, et al. Switching Off Hysteresis in Perovskite Solar Cells by Fine‐Tuning Energy Levels of Extraction Layers. Advanced Energy Materials, 2018, vol. 8, no 21, p. 1703376Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201703376Versió
info:eu-repo/semantics/submittedVersionParaules clau / Matèries
Resum
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 ... [+]
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. [-]
Publicat a
Advanced Energy Materials, 2018, vol. 8, no 21Proyecto de investigación
Spanish Ministerio de Economía y Competitividad (MINECO) of Spain. Grant Number: MAT2016‐76892‐C3‐1‐R; Generalitat Valenciana. Grant Number: ACOMP/2015/105; MINECO for a Ramón y Cajal Fellowship. Grant Number: RYC‐2014‐16809 ;Soltech Initative; HI-ErN projects - Bavarian Ministry for Economy; Excellence Cluster "Engineering Advanced Materials" from the DFGDrets d'accés
Copyright © John Wiley & Sons, Inc.
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