Nano Letters, volume 20, issue 2, pages 1240-1251
Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs.
Liu Chang
1, 2
,
Sun Jingsong
3
,
Tan Wen Liang
3
,
Lu Jianfeng
2
,
Gengenbach Thomas R.
4
,
McNeill Chris
3
,
Ge Ziyi
1
,
Cheng Yi
3, 5
,
Bach Udo
2
1
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, People’s Republic of China
|
2
Department of Chemical Engineering, Monash University, Victoria 3800, Australia
|
3
Department of Materials Science and Engineering, Monash University, Victoria 3800, Australia
|
4
CSIRO Manufacturing, Research Way, Clayton, Victoria 3168, Australia
|
Publication type: Journal Article
Publication date: 2020-01-21
Journal:
Nano Letters
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 10.8
ISSN: 15306984, 15306992
General Chemistry
Condensed Matter Physics
General Materials Science
Mechanical Engineering
Bioengineering
Abstract
3D/2D hybrid perovskite systems have been intensively investigated to improve the stability of perovskite solar cells (PSCs). Whereas, undesired crystallization of 2D perovskite during the film formation process could undermine the structural stability of 2D perovskite materials, which cause serious hysteresis of PSCs after aging. This issue is however rarely studied. Stability study for 3D/2D hybrid systems to date are all under one-direction scan, and the lack of detailed information on the hysteresis after aging compromises the credibility of the stability results. In this work, by correlating the hysteresis of the hybrid PSCs with the 2D crystal structure, we find that the prompt 2D perovskite formation process easily induces numerous crystal imperfections and structural defects. These defects are susceptible to humidity attack and decompose the 2D perovskite to insulating long chain cations and 3D perovskite, which hinder charge transfer or generate charge accumulation. Therefore, large hysteresis is exhibited after aging the 3D/2D hybrid PSCs in ambient, even though reverse-scan power conversion efficiency (PCE) is found to be well-preserved. To address this issue, alkali cations K+ and Rb+ are introduced into the 2D perovskite to exquisitely modulate the crystal formation, which gives rise to higher crystallinity of 2D perovskite and better film morphology with less defects. We achieved PCE beyond 21% due to the preferable charge transfer process and reduced non-radiative recombination losses. The structural features also bring about impressive moisture stability, which results in the corresponding PSCs retaining 93% of its initial PCE and negligible hysteresis after aging in ambient atmosphere for 1200 hours.
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5
10
15
20
25
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- We do not take into account publications that without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Liu C. et al. Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs. // Nano Letters. 2020. Vol. 20. No. 2. pp. 1240-1251.
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Liu C., Sun J., Tan W. L., Lu J., Gengenbach T. R., McNeill C., Ge Z., Cheng Y., Bach U. Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs. // Nano Letters. 2020. Vol. 20. No. 2. pp. 1240-1251.
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TY - JOUR
DO - 10.1021/acs.nanolett.9b04661
UR - https://doi.org/10.1021%2Facs.nanolett.9b04661
TI - Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs.
T2 - Nano Letters
AU - Sun, Jingsong
AU - Liu, Chang
AU - Tan, Wen Liang
AU - Lu, Jianfeng
AU - McNeill, Chris
AU - Ge, Ziyi
AU - Cheng, Yi
AU - Bach, Udo
AU - Gengenbach, Thomas R.
PY - 2020
DA - 2020/01/21 00:00:00
PB - American Chemical Society (ACS)
SP - 1240-1251
IS - 2
VL - 20
SN - 1530-6984
SN - 1530-6992
ER -
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@article{2020_Liu,
author = {Jingsong Sun and Chang Liu and Wen Liang Tan and Jianfeng Lu and Chris McNeill and Ziyi Ge and Yi Cheng and Udo Bach and Thomas R. Gengenbach},
title = {Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs.},
journal = {Nano Letters},
year = {2020},
volume = {20},
publisher = {American Chemical Society (ACS)},
month = {jan},
url = {https://doi.org/10.1021%2Facs.nanolett.9b04661},
number = {2},
pages = {1240--1251},
doi = {10.1021/acs.nanolett.9b04661}
}
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Liu, Chang, et al. “Alkali Cation Doping for Improving the Structural Stability of 2D Perovskite in 3D/2D PSCs..” Nano Letters, vol. 20, no. 2, Jan. 2020, pp. 1240-1251. https://doi.org/10.1021%2Facs.nanolett.9b04661.