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  4. 3D Conjugated Hole Transporting Materials for Efficient and Stable Perovskite Solar Cells and Modules
 
research article

3D Conjugated Hole Transporting Materials for Efficient and Stable Perovskite Solar Cells and Modules

Zhang, Xianfu
•
Liu, Xuepeng
•
Ding, Yunxuan
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May 17, 2024
Advanced Materials

The orthogonal structure of the widely used hole transporting material (HTM) 2,2 ',7,7 '-tetrakis(N, N-di-p-methoxyphenylamino)-9,9 '-spirobifluorene (Spiro-OMeTAD) imparts isotropic conductivity and excellent film-forming capability. However, inherently weak intra- and inter-molecular pi-pi interactions result in low intrinsic hole mobility. Herein, a novel HTM, termed FTPE-ST, with a twist conjugated dibenzo(g,p)chrysene core and coplanar 3,4-ethylenedioxythiophene (EDOT) as extended donor units, is designed to enhance pi-pi interactions, without compromising on solubility. The three-dimensional (3D) configuration provides the material multi-direction charge transport as well as excellent solubility even in 2-methylanisole, and its large conjugated backbone endows the HTM with a high hole mobility. Moreover, the sulfur donors in EDOT units coordinate with lead ions on the perovskite surface, leading to stronger interfacial interactions and the suppression of defects at the perovskite/HTM interface. As a result, perovskite solar cells (PSCs) employing FTPE-ST achieve a champion power conversion efficiency (PCE) of 25.21% with excellent long-time stability, one of the highest PCEs for non-spiro HTMs in n-i-p PSCs. In addition, the excellent film-forming capacity of the HTM enables the fabrication of FTPE-ST-based large-scale PSCs (1.0 cm2) and modules (29.0 cm2), which achieve PCEs of 24.21% (certificated 24.17%) and 21.27%, respectively.|A novel 3D hole transporting material termed FTPE-ST is reported, which has a large conjugated structure leading to high hole mobility, and sulfur atoms that can bind to coordinately unsaturated lead centers on the surface of perovskite films, enhancing interfacial interactions. Perovskite solar cells and modules incorporating FTPE-ST achieve power conversion efficiencies of 25.21 and 21.27%, respectively. image

  • Details
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Type
research article
DOI
10.1002/adma.202310619
Web of Science ID

WOS:001224510100001

Author(s)
Zhang, Xianfu
Liu, Xuepeng
Ding, Yunxuan
Ding, Bin  
Shi, Pengju
Syzgantseva, Olga A.
Syzgantseva, Maria A.
Fei, Zhaofu  
Chen, Jianlin
Rahim, Ghadari
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Date Issued

2024-05-17

Publisher

Wiley-V C H Verlag Gmbh

Published in
Advanced Materials
Subjects

Physical Sciences

•

Technology

•

3,4-Ethylenedioxythiophene

•

Dibenzo(G,P)Chrysene

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Hole Transporting Materials

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Interfacial Interaction

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Perovskite Solar Cells

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Perovskite Solar Module

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GMF  
LCOM  
FunderGrant Number

National Key R&D Program of China

2023YFB4204502

Valais Energy Demonstrators Fund

Swiss National Science Foundation

200020L_1729/1

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Available on Infoscience
June 5, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/208378
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