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Lookup NU author(s): Dr Pablo Docampo
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Perovskite-based photovoltaics have been rapidly developed, with record power conversion efficiencies now exceeding 22%. In order to rationally design efficient and stable perovskite solar cells, it is important to understand not only charge trapping and recombination events, but also processes occurring at the perovskite/transport material (TM) interface, such as charge transfer and interfacial recombination. In this work, time-resolved microwave conductivity measurements are performed to investigate these interfacial processes for methylammonium lead iodide and various state-of-the-art organic TMs. A global kinetic model is developed, which accurately describes both the dynamics of excess charges in the perovskite layer and transfer to charge-specific TMs. The authors conclude that for state-of-the-art materials, such as Spiro-OMeTAD and PCBM, the charge extraction efficiency is not significantly affected by intra-band gap traps for trap densities under 1015 cm-3. Finally, the transfer rates to C60, PCBM, EDOT-OMeTPA, and Spiro-OMeTAD are sufficient to outcompete second order recombination under excitation densities representative for illumination by AM1.5.
Author(s): Hutter EM, Hofman J-J, Petrus ML, Moes M, Abellon RD, Docampo P, Savenije TJ
Publication type: Article
Publication status: Published
Journal: Advanced Energy Materials
Print publication date: 05/07/2017
Online publication date: 17/02/2017
Acceptance date: 02/04/2016
Date deposited: 25/04/2017
ISSN (print): 1614-6832
ISSN (electronic): 1614-6840
Publisher: Wiley-VCH Verlag
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