Oct, 2019
Controlled Redox of Lithium-Ion Endohedral Fullerene for Efficient and Stable Metal Electrode-Free Perovskite Solar Cells
Journal of the American Chemical Society
- Volume
- 141
- Number
- 42
- First page
- 16553
- Last page
- 16558
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1021/jacs.9b06418
- Publisher
- AMER CHEMICAL SOC
High efficiency perovskite solar cells have underpinned the rapid growth of the field. However, their low device stability limits further advancement. Hygroscopic lithium bis(trifluoromethanesulfonyl)imide (Li+TFSI-) and metal electrode are the main causes of the device instability. In this work, the redox reaction between lithium-ion endohedral fullerenes and 2,2',7,7'-tetrakis (N,N-di-p-methoxyphenylamine)-9,9'-spirobi-fluorene (spiro-MeOTAD) was controlled to optimize the amount of oxidized spiro-MeOTAD and antioxidizing neutral endohedral fullerenes. Application of this mixture to metal-free carbon nanotube (CNT)-laminated perovskite solar cells resulted in 17.2% efficiency with a stability time of more than 1100 h under severe conditions (temperature = 60 degrees C, humidity = 70%). Such high performance is attributed to the uninhibited charge flow, no metal-ion migration, and the enhanced antioxidizing activity of the devices.
- Link information
- ID information
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- DOI : 10.1021/jacs.9b06418
- ISSN : 1520-5126
- ISSN : 0002-7863
- eISSN : 1520-5126
- ORCID - Put Code : 64331097
- Web of Science ID : WOS:000492800500005