Long-Lived Charge Extraction in CsMAFA-Based Perovskites in n-i-p and p-i-n Structures

Long-Lived Charge Extraction in CsMAFA-Based Perovskites in n-i-p and p-i-n Structures

Zhao, J. (TU Delft ChemE/Opto-electronic Materials)
van der Poll, L.M. (TU Delft ChemE/Opto-electronic Materials)
Looman, Sander L. (Student TU Delft)
Yan, J. (TU Delft Photovoltaic Materials and Devices)
Thieme, J. (TU Delft ChemE/O&O groep)
Ibrahim, B. (TU Delft ChemE/O&O groep)
Savenije, T.J. (TU Delft ChemE/Opto-electronic Materials)

2024

To increase the open-circuit voltage in solar cells based on triple cation, mixed halide perovskites, reducing recombination processes at the interfaces with transport layers (TLs) is key. Here, we investigated the charge carrier dynamics in bilayers and trilayers of Cs_0.05MA_0.10FA_0.85Pb(I_0.97Br_0.03)₃ (CsMAFA) combined with TLs using time-resolved microwave conductance (TRMC) measurements without and with bias illumination (BI). In the bilayers, we find balanced mobilities for electrons and holes in CsMAFA and nearly quantitative carrier extraction. The small, rapidly decaying TRMC signals for n-i-p- and p-i-n triple layers indicate both carriers are extracted. Applying BI leads to the charging of the TLs and the corresponding electric field prevents additional charge extraction, which demonstrates long-lived charge separation over the CsMAFA/TLs. Most importantly, for all bilayer combinations showing long-lived charge separation, an increase of the quasi-Fermi level splitting with respect to that of the CsMAFA layer is found.

http://resolver.tudelft.nl/uuid:5814554a-f259-43c0-9c61-67f9fcd780de

https://doi.org/10.1021/acsenergylett.4c00250

2380-8195

ACS Energy Letters, 9 (5), 2456-2463

Institutional Repository

journal article

© 2024 J. Zhao, L.M. van der Poll, Sander L. Looman, J. Yan, J. Thieme, B. Ibrahim, T.J. Savenije