TY - JOUR
T1 - Tailoring Molecular-Scale Contact at the Perovskite/Polymeric Hole-Transporting Material Interface for Efficient Solar Cells
AU - Sun, Jiaonan
AU - Ma, Ke
AU - Lin, Zih Yu
AU - Tang, Yuanhao
AU - Varadharajan, Dharini
AU - Chen, Alexander X.
AU - Atapattu, Harindi R.
AU - Lee, Yoon Ho
AU - Chen, Ke
AU - Boudouris, Bryan W.
AU - Graham, Kenneth R.
AU - Lipomi, Darren J.
AU - Mei, Jianguo
AU - Savoie, Brett M.
AU - Dou, Letian
N1 - Publisher Copyright:
© 2023 The Authors. Advanced Materials published by Wiley-VCH GmbH.
PY - 2023/6/28
Y1 - 2023/6/28
N2 - Perovskite solar cells (PSCs) have delivered a power conversion efficiency (PCE) of more than 25% and incorporating polymers as hole-transporting layers (HTLs) can further enhance the stability of devices toward the goal of commercialization. Among the various polymeric hole-transporting materials, poly(triaryl amine) (PTAA) is one of the promising HTL candidates with good stability; however, the hydrophobicity of PTAA causes problematic interfacial contact with the perovskite, limiting the device performance. Using molecular side-chain engineering, a uniform 2D perovskite interlayer with conjugated ligands, between 3D perovskites and PTAA is successfully constructed. Further, employing conjugated ligands as cohesive elements, perovskite/PTAA interfacial adhesion is significantly improved. As a result, the thin and lateral extended 2D/3D heterostructure enables as-fabricated PTAA-based PSCs to achieve a PCE of 23.7%, improved from the 18% of reference devices. Owing to the increased ion-migration energy barrier and conformal 2D coating, unencapsulated devices with the new ligands exhibit both superior thermal stability under 60 °C heating and moisture stability in ambient conditions.
AB - Perovskite solar cells (PSCs) have delivered a power conversion efficiency (PCE) of more than 25% and incorporating polymers as hole-transporting layers (HTLs) can further enhance the stability of devices toward the goal of commercialization. Among the various polymeric hole-transporting materials, poly(triaryl amine) (PTAA) is one of the promising HTL candidates with good stability; however, the hydrophobicity of PTAA causes problematic interfacial contact with the perovskite, limiting the device performance. Using molecular side-chain engineering, a uniform 2D perovskite interlayer with conjugated ligands, between 3D perovskites and PTAA is successfully constructed. Further, employing conjugated ligands as cohesive elements, perovskite/PTAA interfacial adhesion is significantly improved. As a result, the thin and lateral extended 2D/3D heterostructure enables as-fabricated PTAA-based PSCs to achieve a PCE of 23.7%, improved from the 18% of reference devices. Owing to the increased ion-migration energy barrier and conformal 2D coating, unencapsulated devices with the new ligands exhibit both superior thermal stability under 60 °C heating and moisture stability in ambient conditions.
KW - 2D/3D heterostructures
KW - PTAA
KW - interface engineering
KW - perovskite solar cells
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U2 - 10.1002/adma.202300647
DO - 10.1002/adma.202300647
M3 - Article
C2 - 36942854
AN - SCOPUS:85158105704
SN - 0935-9648
VL - 35
JO - Advanced Materials
JF - Advanced Materials
IS - 26
M1 - 2300647
ER -