TY - JOUR
T1 - Organic Interlayers for Hole Transfer in MA-Free Mixed PB/SN Halide Perovskites for All-Perovskite Tandem Solar Cells
AU - Allegre, Jules
AU - Lemaitre, Noëlla
AU - Berenguier, Baptiste
AU - Bouttemy, Muriel
AU - Frégnaux, Mathieu
AU - Schulz, Philip
AU - Berson, Solenn
N1 - Publisher Copyright:
© 2025 The Authors. Published by American Chemical Society.
PY - 2025/3/24
Y1 - 2025/3/24
N2 - The efficiency of mixed lead-tin perovskite solar cells has increased rapidly, thanks to efficient passivation strategies of bulk and interfacial defects. For example, this occurs at the hole-transport layer and the perovskite interface. Here, we compare the self-assembled monolayers and multilayers (SAMs), [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz) and methylphosphonic acid (MPA), to a PEDOT:PSS layer at the rear interface of a MA-free narrow band gap perovskite in single-junction (SJ) and all-perovskite tandem solar cells. PEDOT:PSS-based devices show the best power conversion efficiency of 14% in SJ and 17.2% in all-perovskite tandem architecture. By using photoluminescence and ultraviolet photoelectron spectroscopy, we show that this behavior is due to better energy alignment at the PEDOT:PSS/PK than the SAM/PK interface. However, SAMs also show lower nonradiative recombination rates at this interface. The results identify the limits of the effectiveness of 2PACz and MPA in mixed lead-tin MA-free perovskite solar cells and confirm the need for other SAMs with improved energy-level alignment while maintaining their passivating properties.
AB - The efficiency of mixed lead-tin perovskite solar cells has increased rapidly, thanks to efficient passivation strategies of bulk and interfacial defects. For example, this occurs at the hole-transport layer and the perovskite interface. Here, we compare the self-assembled monolayers and multilayers (SAMs), [2-(9H-carbazol-9-yl)ethyl]phosphonic acid (2PACz) and methylphosphonic acid (MPA), to a PEDOT:PSS layer at the rear interface of a MA-free narrow band gap perovskite in single-junction (SJ) and all-perovskite tandem solar cells. PEDOT:PSS-based devices show the best power conversion efficiency of 14% in SJ and 17.2% in all-perovskite tandem architecture. By using photoluminescence and ultraviolet photoelectron spectroscopy, we show that this behavior is due to better energy alignment at the PEDOT:PSS/PK than the SAM/PK interface. However, SAMs also show lower nonradiative recombination rates at this interface. The results identify the limits of the effectiveness of 2PACz and MPA in mixed lead-tin MA-free perovskite solar cells and confirm the need for other SAMs with improved energy-level alignment while maintaining their passivating properties.
KW - MA free tin−lead perovskite
KW - all-perovskite tandem
KW - hole-transport layer
KW - organic interlayer
KW - self-assembled monolayers
KW - solar cell
UR - https://www.scopus.com/pages/publications/105001074917
U2 - 10.1021/acsaem.4c02962
DO - 10.1021/acsaem.4c02962
M3 - Article
AN - SCOPUS:105001074917
SN - 2574-0962
VL - 8
SP - 3434
EP - 3440
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 6
ER -