CO2 doping of organic interlayers for perovskite solar cells

Jaemin Kong, Yongwoo Shin, Jason A. Röhr, Hang Wang, Juan Meng, Yueshen Wu, Adlai Katzenberg, Geunjin Kim, Dong Young Kim, Tai- De Li, Edward Chau, Francisco Antonio, Tana Siboonruang, Sooncheol Kwon, Kwanghee Lee, Jin Ryoun Kim, Miguel A. Modestino, Hailiang Wang and André D. Taylor ()
Additional contact information
Jaemin Kong: New York University Tandon School of Engineering
Yongwoo Shin: Samsung Semiconductor, Inc.
Jason A. Röhr: New York University Tandon School of Engineering
Hang Wang: New York University Tandon School of Engineering
Juan Meng: New York University Tandon School of Engineering
Yueshen Wu: Yale University
Adlai Katzenberg: New York University Tandon School of Engineering
Geunjin Kim: Korea Research Institute of Chemical Technology (KRICT)
Dong Young Kim: Samsung Electronics
Tai- De Li: The Graduate Center of the City University of New York
Edward Chau: New York University Tandon School of Engineering
Francisco Antonio: Yale University
Tana Siboonruang: New York University Tandon School of Engineering
Sooncheol Kwon: Wonkwang University
Kwanghee Lee: Gwangju Institute of Science and Technology (GIST)
Jin Ryoun Kim: New York University Tandon School of Engineering
Miguel A. Modestino: New York University Tandon School of Engineering
Hailiang Wang: Yale University
André D. Taylor: New York University Tandon School of Engineering

Nature, 2021, vol. 594, issue 7861, 51-56

Abstract: Abstract In perovskite solar cells, doped organic semiconductors are often used as charge-extraction interlayers situated between the photoactive layer and the electrodes. The π-conjugated small molecule 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9-spirobifluorene (spiro-OMeTAD) is the most frequently used semiconductor in the hole-conducting layer1–6, and its electrical properties considerably affect the charge collection efficiencies of the solar cell7. To enhance the electrical conductivity of spiro-OMeTAD, lithium bis(trifluoromethane)sulfonimide (LiTFSI) is typically used in a doping process, which is conventionally initiated by exposing spiro-OMeTAD:LiTFSI blend films to air and light for several hours. This process, in which oxygen acts as the p-type dopant8–11, is time-intensive and largely depends on ambient conditions, and thus hinders the commercialization of perovskite solar cells. Here we report a fast and reproducible doping method that involves bubbling a spiro-OMeTAD:LiTFSI solution with CO2 under ultraviolet light. CO2 obtains electrons from photoexcited spiro-OMeTAD, rapidly promoting its p-type doping and resulting in the precipitation of carbonates. The CO2-treated interlayer exhibits approximately 100 times higher conductivity than a pristine film while realizing stable, high-efficiency perovskite solar cells without any post-treatments. We also show that this method can be used to dope π-conjugated polymers.

Date: 2021
References: Add references at CitEc
Citations: View citations in EconPapers (4)

Downloads: (external link)
https://www.nature.com/articles/s41586-021-03518-y Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:594:y:2021:i:7861:d:10.1038_s41586-021-03518-y

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/s41586-021-03518-y

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().