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  Fundamental Flaw in the Current Construction of the TiO2 Electron Transport Layer of Perovskite Solar Cells and Its Elimination

Yan, Y., Liu, C., Yang, Y., Hu, G., Tiwari, V., Jiang, D.-e., et al. (2021). Fundamental Flaw in the Current Construction of the TiO2 Electron Transport Layer of Perovskite Solar Cells and Its Elimination. ACS Applied Materials and Interfaces, 13(33), 39371-39378. doi:10.1021/acsami.1c09742.

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am1c09742_si_001.pdf (Supplementary material), 914KB
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https://dx.doi.org/10.1021/acsami.1c09742 (Publisher version)
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 Creators:
Yan, Y.1, 2, 3, Author              
Liu, C.4, Author
Yang, Y.4, Author
Hu, G.5, Author
Tiwari, V.3, 6, Author              
Jiang, D.-e.7, Author
Peng, W.1, Author
Jha, A.3, 8, 9, Author              
Duan, H.-G.3, 10, 11, Author              
Tellkamp, F.12, Author              
Ding, Y.4, Author
Shi, W.13, Author
Yuan, S.13, Author
Miller, R. J. D.3, 11, Author              
Ma, W.1, 14, Author
Zhao, Jincai1, 14, Author
Affiliations:
1Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, The Chinese Academy of Sciences, ou_persistent22              
2School of Chemistry and Chemical Engineering, Jiangsu University, ou_persistent22              
3Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              
4State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, ou_persistent22              
5Department of Chemistry and Biochemistry, Queens College of the City University of New York, ou_persistent22              
6Department of Chemistry, University of Hamburg, ou_persistent22              
7Department of Chemistry, University of California, ou_persistent22              
8The Rosalind Franklin Institute, ou_persistent22              
9Research Complex at Harwell, Rutherford Appleton Laboratory, ou_persistent22              
10Institut für Theoretische Physik, Universität Hamburg, ou_persistent22              
11The Departments of Chemistry and Physics, University of Toronto, ou_persistent22              
12Machine Physics, Scientific Service Units, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074322              
13School of Chemistry and Chemical Engineering, Jiangsu University, ou_persistent22              
14University of Chinese Academy of Sciences, ou_persistent22              

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Free keywords: perovskite solar cells, TiO2 electron transport layer, deprotonation, Ti−H species
 Abstract: The top-performing perovskite solar cells (efficiency > 20%) generally rely on the use of a nanocrystal TiO2 electron transport layer (ETL). However, the efficacies and stability of the current stereotypically prepared TiO2 ETLs employing commercially available TiO2 nanocrystal paste are far from their maximum values. As revealed herein, the long-hidden reason for this discrepancy is that acidic protons (∼0.11 wt %) always remain in TiO2 ETLs after high-temperature sintering due to the decomposition of the organic proton solvent (mostly alcohol). These protons readily lead to the formation of Ti–H species upon light irradiation, which act to block the electron transfer at the perovskite/TiO2 interface. Affront this challenge, we introduced a simple deprotonation protocol by adding a small amount of strong proton acceptors (sodium ethoxide or NaOH) into the common TiO2 nanocrystal paste precursor and replicated the high-temperature sintering process, which wiped out nearly all protons in TiO2 ETLs during the sintering process. The use of deprotonated TiO2 ETLs not only promotes the PCE of both MAPbI3-based and FA0.85MA0.15PbI2.55Br0.45-based devices over 20% but also significantly improves the long-term photostability of the target devices upon 1000 h of continuous operation.

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Language(s): eng - English
 Dates: 2021-06-022021-08-052021-08-152021-08-25
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acsami.1c09742
 Degree: -

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Title: ACS Applied Materials and Interfaces
  Abbreviation : ACS Appl. Mater. Interfaces
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 13 (33) Sequence Number: - Start / End Page: 39371 - 39378 Identifier: ISSN: 1944-8244
CoNE: https://pure.mpg.de/cone/journals/resource/1944-8244