TY - JOUR
T1 - Long-Lived Charge Extraction in CsMAFA-Based Perovskites in n-i-p and p-i-n Structures
AU - Zhao, Jiashang
AU - van der Poll, Lara M.
AU - Looman, Sander L.
AU - Yan, Jin
AU - Thieme, Jos
AU - Ibrahim, Bahiya
AU - Savenije, Tom J.
PY - 2024
Y1 - 2024
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85192251311&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.4c00250
DO - 10.1021/acsenergylett.4c00250
M3 - Article
AN - SCOPUS:85192251311
SN - 2380-8195
VL - 9
SP - 2456
EP - 2463
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 5
ER -
