Over 20% efficiency in methylammonium lead Iodide perovskite solar cells with enhanced stability via “in-situ solidification” of the TiO2 compact layer
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
In methylammonium lead iodide (MAPbI3) perovskite solar cells (PSCs), the device performance is strongly influenced by the TiO2 elec-tron transport layer (ETL). Typically, the ETL needs to simultaneously be thin and pinhole-free in order to have high transmittance and avoid shunting. In this work, we develop an “in-situ solidification” process following spin coating, in which the titanium-based precursor (ti-tanium (diisopropoxide) bis (2,4-pentaneclionate)) is dried under vacuum to rapidly achieve continuous TiO2 layers. We refer to this as gas-phase quenching. This results in thin (60±10 nm), uniform and pinhole-free TiO2 films. The PSCs based on the gas-phase quenched TiO2 exhibits improved power conversion efficiency, with a median value of 18.23% (champion value of 20.43%), compared to 9.03% and 14.09% for the untreated devices. Gas-phase quenching is further shown to be effective in enabling efficient charge transfer at the MAPbI3/TiO2 heterointerface. Furthermore, the stability of the gas-phase quenched devices is enhanced in ambient air as well as under 1-sun illumination. In addition, we achieve 12.1% efficiency in upscaled devices (1.1 cm2 active area).
Date Issued
2020-01-21
Date Acceptance
2020-01-21
Citation
ACS Applied Materials & Interfaces, 2020, 12 (6), pp.7135-7143
ISSN
1944-8244
Publisher
American Chemical Society (ACS)
Start Page
7135
End Page
7143
Journal / Book Title
ACS Applied Materials & Interfaces
Volume
12
Issue
6
Copyright Statement
© 2020 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.9b19153
Sponsor
Royal Academy of Engineering
Royal Academy Of Engineering
Isaac Newton Trust
Identifier
https://pubs.acs.org/doi/10.1021/acsami.9b19153
Grant Number
RF\201718\17101
RF\201718\17101
Minute 19.07(d)
Subjects
03 Chemical Sciences
09 Engineering
Nanoscience & Nanotechnology
Publication Status
Published
Article Number
acsami.9b19153
Date Publish Online
2020-01-21