Defect-Tolerant Sodium-Based Dopant in Charge Transport Layers for Highly Efficient and Stable Perovskite Solar Cells

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To extract charges more efficiently through charge-transporting layers (CTLs), various dopants are necessary. Lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) is the most widely used dopant in electron- and hole-transporting layers. However, Li+ ions easily migrate into the perovskite and deteriorate the device performance. To address this issue, several efforts such as introducing a buffer layer have been tried, but the issue is still not fully resolved. Thus it is required to find a simple way without additional treatments. In this work, we propose a simple strategy to use defect-tolerant dopant in CTLs, sodium bis(trifluoromethanesulfonyl)imide (Na-TFSI), to improve both the efficiency and the stability of perovskite solar cells (PSCs). The PSCs with Na-TFSI for both the electron-transport layer and the hole-transport layer show the highest power conversion efficiency up to 22.4%. In addition, the device with Na-TFSI exhibited better long-term operating stability at 45 degrees C, maintaining >80% of the initial performance even after 500 h of continuous 1 sun illumination.
Publisher
AMER CHEMICAL SOC
Issue Date
2020-04
Language
English
Article Type
Article
Citation

ACS ENERGY LETTERS, v.5, no.4, pp.1198 - 1205

ISSN
2380-8195
DOI
10.1021/acsenergylett.0c00514
URI
http://hdl.handle.net/10203/289925
Appears in Collection
CBE-Journal Papers(저널논문)
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