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Charge Carrier Recombination at Perovskite/Hole Transport Layer Interfaces Monitored by Time-Resolved Spectroscopy

Khan, Jafar I.; Isikgor, Furkan H.; Ugur, Esma; Raja, Waseem; Harrison, George T.; Yengel, Emre; Anthopoulos, Thomas D.; De Wolf, Stefaan; Laquai, Frédéric


Furkan H. Isikgor

Esma Ugur

Waseem Raja

George T. Harrison

Emre Yengel

Thomas D. Anthopoulos

Stefaan De Wolf

Frédéric Laquai


Carrier recombination at the interface between charge extraction layers and the perovskite photoactive layer in solar cells reduces the quasi-Fermi level splitting (QFLS) and hence the device's open-circuit voltage (VOC). Distinguishing between interfacial carrier recombination and charge extraction requires selective probing of carrier dynamics with transient optical spectroscopy techniques. However, bulk recombination, interfacial recombination, and charge extraction all contribute to the transient response, making a precise determination of individual rates challenging. Here, we compare two commonly used hole transport layers (HTLs), namely, PTAA and NiOx, adjacent to prototypical MAPI3 perovskite photoactive layers and wide-bandgap perovskites. We demonstrate that combining time-resolved photoluminescence (TR-PL) and transient absorption (TA) spectroscopy measurements can reveal recombination losses associated with the perovskite/NiOx interface, as confirmed by drift-diffusion simulations. The best performing MAPI3/PTAA-based device exhibits less nonradiative recombination and more efficient charge extraction, facilitated by favorable energy level alignment.


Khan, J. I., Isikgor, F. H., Ugur, E., Raja, W., Harrison, G. T., Yengel, E., …Laquai, F. (2021). Charge Carrier Recombination at Perovskite/Hole Transport Layer Interfaces Monitored by Time-Resolved Spectroscopy. ACS Energy Letters, 6(12), 4155-4164.

Journal Article Type Article
Acceptance Date Oct 25, 2021
Online Publication Date Nov 1, 2021
Publication Date Dec 10, 2021
Deposit Date May 16, 2024
Publicly Available Date May 17, 2024
Journal ACS Energy Letters
Electronic ISSN 2380-8195
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 6
Issue 12
Pages 4155-4164
Keywords Interfaces; Layers; Oxides; Perovskites; Recombination
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Accepted manuscript (1.5 Mb)

Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Energy Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see doi:10.1021/acsenergylett.1c01931

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