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  4. Ionic dipolar switching hinders charge collection in perovskite solar cells with normal and inverted hysteresis
 
research article

Ionic dipolar switching hinders charge collection in perovskite solar cells with normal and inverted hysteresis

Almora, Osbel
•
Lopez-Varo, Pilar
•
Cho, Kyung Taek  
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June 15, 2019
Solar Energy Materials and Solar Cells

Drift-diffusion modeling of the ionic dipole switching from the measurement of fast scanned and long pre-biased electrical response is proposed as a novel protocol for evaluation of limit hysteretic effects in perovskite solar cells. Up to eight systems were measured including CH3NH3PbI3, Cs(0.1)FA(0.74)MA(0.13)PbI(2.48)Br(0.39) and FA(0.83)MA(0.17)Pb(1)(.1)Br(0.22)I(2.98) 3D perovskite absorbers, as well as 2D capping layers towards the selective contacts. We show systematic hysteretic patterns, even among typical hysteresis-free devices, including normal and inverted hysteresis as general dissimilar trend between CH3NH3PbI3 and mixed perovskite cells, respectively. Particularly, strong changes in the short-circuit current density (J(sc)) were identified, in addition to different trends affecting the fill factor (FF) and the open-circuit voltage (V-oc). The changes in J(sc) were analyzed with stateof-the-art numerical drift-diffusion simulations concluding in an important reduction in the charge collection due to ionic distribution switching depending on the pre-biasing protocol and the type of absorbing perovskite. It is shown that mixed perovskites inhibit ionic dipolar switching. In addition, our calculi signal on the required conditions for the occurrence of inverted hysteresis and changes in the V-oc. Regarding the FF and V-oc patterns a new empirical approach is introduced and corresponding interpretations are proposed.

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Type
research article
DOI
10.1016/j.solmat.2019.03.003
Web of Science ID

WOS:000466454600035

Author(s)
Almora, Osbel
Lopez-Varo, Pilar
Cho, Kyung Taek  
Aghazada, Sadig  
Meng, Wei
Hou, Yi
Echeverria-Arrondo, Carlos
Zimmermann, Iwan  
Matt, Gebhard J.
Jimenez-Tejada, Juan A.
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Date Issued

2019-06-15

Published in
Solar Energy Materials and Solar Cells
Volume

195

Start page

291

End page

298

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GMF  
Available on Infoscience
June 8, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/178795
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