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

Journal article (2024)

Authors

J. Zhao ChemE/Opto-electronic Materials - AS
L.M. van der Poll ChemE/Opto-electronic Materials - AS
J. Yan Photovoltaic Materials and Devices - EEMCS
J. Thieme ChemE/O&O groep - AS
B. Ibrahim ChemE/O&O groep - AS
T.J. Savenije ChemE/Opto-electronic Materials - AS
Research Group
ChemE/Opto-electronic Materials (AS) (TU Delft)
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Published Date

2024

Language

English

Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Opto-electronic Materials

Abstract

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 Cs0.05MA0.10FA0.85Pb(I0.97Br0.03)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.