Journal
ACS ENERGY LETTERS
Volume 5, Issue 4, Pages 1198-1205Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c00514
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Funding
- Korea Research Institute of Chemical Technology (KRICT), Republic of Korea [KS2022-10]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry Energy [20163010012470, 20183010014470]
- National Research Council of Science & Technology (NST) by the Korea government (MSIT) [CAP-18-05-KAERI]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20183010014470] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [CAP-18-05-KAERI] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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