Alkali Salts as Interface Modifiers in n-i-p Hybrid Perovskite Solar Cells
(2019) In Solar RRL 3(9).- Abstract
After demonstration of a 23% power conversion efficiency, a high operational stability is the next most important scientific and technological challenge in perovskite solar cells (PSCs). A potential failure mechanism is tied to a bias-induced ion migration, which causes current–voltage hysteresis and a decay in the device performance over time. Herein, alkali salts are shown to mitigate hysteresis and stabilize device performance in n-i-p hybrid planar PSCs. Different alkali salts of potassium chloride, iodide, and nitrate as well as sodium chloride and iodide are deposited from aqueous solution onto the n-type contact, based on SnO2, prior to deposition of the perovskite absorber... (More)
After demonstration of a 23% power conversion efficiency, a high operational stability is the next most important scientific and technological challenge in perovskite solar cells (PSCs). A potential failure mechanism is tied to a bias-induced ion migration, which causes current–voltage hysteresis and a decay in the device performance over time. Herein, alkali salts are shown to mitigate hysteresis and stabilize device performance in n-i-p hybrid planar PSCs. Different alkali salts of potassium chloride, iodide, and nitrate as well as sodium chloride and iodide are deposited from aqueous solution onto the n-type contact, based on SnO2, prior to deposition of the perovskite absorber Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3. Introduction of potassium-based alkali salts suppresses the current–voltage hysteresis and stabilizes the operational device stability at the maximum power point. This is attributed to the suppression of hole trapping at the n-type selective transport layer (SnO2)/perovskite interface observed by surface photovoltage spectroscopy, which is interpreted to reduce interfacial recombination and improve charge carrier extraction. The best and most stable performance of 19% is achieved using potassium nitrate as the interface modifier. Devices with higher and more stable performance exhibit substantially lower current transients, analyzed during maximum power point tracking.
(Less)
- author
- Dagar, Janardan ; Hirselandt, Katrin ; Merdasa, Aboma LU ; Czudek, Aniela ; Munir, Rahim ; Zu, Fengshuo ; Koch, Norbert ; Dittrich, Thomas and Unger, Eva L. LU
- organization
- publishing date
- 2019-09
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- alkali salts, interface modification, n-i-p devices, perovskite solar cells
- in
- Solar RRL
- volume
- 3
- issue
- 9
- article number
- 1900088
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:85083623216
- ISSN
- 2367-198X
- DOI
- 10.1002/solr.201900088
- language
- English
- LU publication?
- yes
- id
- fb2f1a41-8190-4944-85c2-09b39436a9e9
- date added to LUP
- 2020-06-05 11:15:21
- date last changed
- 2023-11-20 05:44:55
@article{fb2f1a41-8190-4944-85c2-09b39436a9e9,
abstract = {{<p>After demonstration of a 23% power conversion efficiency, a high operational stability is the next most important scientific and technological challenge in perovskite solar cells (PSCs). A potential failure mechanism is tied to a bias-induced ion migration, which causes current–voltage hysteresis and a decay in the device performance over time. Herein, alkali salts are shown to mitigate hysteresis and stabilize device performance in n-i-p hybrid planar PSCs. Different alkali salts of potassium chloride, iodide, and nitrate as well as sodium chloride and iodide are deposited from aqueous solution onto the n-type contact, based on SnO<sub>2</sub>, prior to deposition of the perovskite absorber Cs<sub>0.05</sub>(FA<sub>0.83</sub>MA<sub>0.17</sub>)<sub>0.95</sub>Pb(I<sub>0.83</sub>Br<sub>0.17</sub>)<sub>3</sub>. Introduction of potassium-based alkali salts suppresses the current–voltage hysteresis and stabilizes the operational device stability at the maximum power point. This is attributed to the suppression of hole trapping at the n-type selective transport layer (SnO<sub>2</sub>)/perovskite interface observed by surface photovoltage spectroscopy, which is interpreted to reduce interfacial recombination and improve charge carrier extraction. The best and most stable performance of 19% is achieved using potassium nitrate as the interface modifier. Devices with higher and more stable performance exhibit substantially lower current transients, analyzed during maximum power point tracking.</p>}},
author = {{Dagar, Janardan and Hirselandt, Katrin and Merdasa, Aboma and Czudek, Aniela and Munir, Rahim and Zu, Fengshuo and Koch, Norbert and Dittrich, Thomas and Unger, Eva L.}},
issn = {{2367-198X}},
keywords = {{alkali salts; interface modification; n-i-p devices; perovskite solar cells}},
language = {{eng}},
number = {{9}},
publisher = {{Wiley-Blackwell}},
series = {{Solar RRL}},
title = {{Alkali Salts as Interface Modifiers in n-i-p Hybrid Perovskite Solar Cells}},
url = {{http://dx.doi.org/10.1002/solr.201900088}},
doi = {{10.1002/solr.201900088}},
volume = {{3}},
year = {{2019}},
}