A multifaceted ferrocene interlayer for highly stable and efficient lithium doped spiro-OMeTAD-based perovskite solar cells
Author(s)
Webb, T
Haque, S
Westbrook, R
Macdonald, T
Type
Journal Article
Abstract
Over the last decade, 2,2″,7,7″-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) has remained the hole transporting layer (HTL) of choice for producing high efficiency perovskite solar cells (PSCs). However, PSCs incorporating spiro-OMeTAD suffer significantly from dopant induced instability and non-ideal band alignments. Herein, a new approach is presented for tackling these issues using the functionality of organometallocenes to bind to Li+ dopant ions, rendering them immobile and reducing their impact on the degradation of PSCs. Consequently, significant improvements are observed in device stability under elevated temperature and humidity, conditions in which ion migration occurs most readily. Remarkably, PSCs prepared with ferrocene retain 70% of the initial power conversion efficiency (PCE) after a period of 1250 h as compared to only 8% in the control. Synergistically, it is also identified that ferrocene improves the hole extraction yield at the HTL interface and reduces interfacial recombination enabling PCEs to reach 23.45%. This work offers a pathway for producing highly efficient spiro-OMeTAD devices with conventional dopants via addressing the key challenge of dopant induced instability in leading PSCs.
Date Issued
2022-07-14
Online Publication Date
2022-05-23T14:08:16Z
Date Acceptance
2022-04-20
ISSN
1614-6832
Publisher
Wiley-VCH Verlag
Start Page
1
End Page
14
Journal / Book Title
Advanced Energy Materials
Volume
12
Issue
26
Copyright Statement
© 2022 The Authors. Advanced Energy Materials published by Wiley-VCH GmbH
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URI
Identifier
https://onlinelibrary.wiley.com/doi/10.1002/aenm.202200666
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Chemistry
Materials Science
Physics
ferrocene
heterojunction engineering
LiTFSI
perovskites
spiro-OMeTAD
CHARGE-TRANSFER
HOLE TRANSPORT
HALIDE PEROVSKITE
PERFORMANCE ENHANCEMENT
ION MIGRATION
DYE
LAYER
STABILITY
ELECTRON
FILMS
0303 Macromolecular and Materials Chemistry
0912 Materials Engineering
0915 Interdisciplinary Engineering
Publication Status
Published
Date Publish Online
2022-05-20