TY - JOUR
T1 - Thickness-insensitive polymeric hole-transporting layer for efficient inverted perovskite solar cells
AU - Cui, Zhengbo
AU - Li, Wen
AU - Feng, Bo
AU - Li, Yunfei
AU - Sun, Nannan
AU - Zhang, Wenxiao
AU - Fu, Sheng
AU - Li, Xiaodong
AU - Fang, Junfeng
N1 - Publisher Copyright:
© 2025 Elsevier Inc.
PY - 2025/7/16
Y1 - 2025/7/16
N2 - Recently, inverted perovskite solar cells (PSCs) have been developed rapidly with the assistance of hole-transporting layers (HTLs), especially self-assembled monolayers (SAMs). However, present device performance strongly depends on HTL thickness, which should be strictly controlled to ∼5 nm, and >10 nm SAM HTL will induce severe efficiency loss. Here, we report a thickness-insensitive polymeric HTL (P3CT-TBB) through poly[3-(4-carboxylbutyl) thiophene] (P3CT) p-doping with 1,3,5-tris(bromomethyl)benzene (TBB). TBB can withdraw electrons from the thiophene chain in P3CT to promote its p-doping. The doped P3CT-TBB exhibits a ∼10-fold increase in film conductivity in comparison with control P3CT. As a result, P3CT-TBB-based inverted PSCs show the highest efficiency of >26% without thickness sensitiveness, and >24% efficiency remains in PSCs with over 60 nm P3CT-TBB. Besides, due to the improved hole extraction, device stability is also improved, retaining ∼90% of initial efficiency after maximum power point (MPP) tracking for 1,200 h under the ISOS-L-2 protocol (65°C).
AB - Recently, inverted perovskite solar cells (PSCs) have been developed rapidly with the assistance of hole-transporting layers (HTLs), especially self-assembled monolayers (SAMs). However, present device performance strongly depends on HTL thickness, which should be strictly controlled to ∼5 nm, and >10 nm SAM HTL will induce severe efficiency loss. Here, we report a thickness-insensitive polymeric HTL (P3CT-TBB) through poly[3-(4-carboxylbutyl) thiophene] (P3CT) p-doping with 1,3,5-tris(bromomethyl)benzene (TBB). TBB can withdraw electrons from the thiophene chain in P3CT to promote its p-doping. The doped P3CT-TBB exhibits a ∼10-fold increase in film conductivity in comparison with control P3CT. As a result, P3CT-TBB-based inverted PSCs show the highest efficiency of >26% without thickness sensitiveness, and >24% efficiency remains in PSCs with over 60 nm P3CT-TBB. Besides, due to the improved hole extraction, device stability is also improved, retaining ∼90% of initial efficiency after maximum power point (MPP) tracking for 1,200 h under the ISOS-L-2 protocol (65°C).
KW - doping
KW - hole-transporting layer
KW - inverted perovskite solar cells
KW - stability
KW - thickness-insensitive
UR - https://www.scopus.com/pages/publications/105009654665
U2 - 10.1016/j.joule.2025.102011
DO - 10.1016/j.joule.2025.102011
M3 - 文章
AN - SCOPUS:105009654665
SN - 2542-4351
VL - 9
JO - Joule
JF - Joule
IS - 7
M1 - 102011
ER -