Charge Carrier Recombination at Perovskite/Hole Transport Layer Interfaces Monitored by Time-Resolved Spectroscopy
AuthorsKhan, Jafar Iqbal
Isikgor, Furkan Halis
Harrison, George T.
Anthopoulos, Thomas D.
De Wolf, Stefaan
KAUST DepartmentKAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberOSR-2018-CARF/CCF-3079.
Embargo End Date2022-11-01
Permanent link to this recordhttp://hdl.handle.net/10754/673091
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AbstractCarrier 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.
CitationKhan, 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, 4155–4164. doi:10.1021/acsenergylett.1c01931
SponsorsThis publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2018-CARF/CCF-3079.
PublisherAmerican Chemical Society (ACS)
JournalACS Energy Letters