Anais do Workshop INEO 2023

MONITORING THE SEGREGATION OF THE LITFSI ADDITIVE IN SPIRO-OMETAD LAYER

Published in 12/12/2023 - ISBN: 978-65-272-0088-8

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Paper Title
MONITORING THE SEGREGATION OF THE LITFSI ADDITIVE IN SPIRO-OMETAD LAYER
Authors
  • Eduardo Henrique dos Santos Rosa
  • Anderson Emanuel Ximim Gavim
  • F. L. De Araújo (PD); IQ-UNICAMP
  • Andreia de Morais
  • Jilian Nei de Freitas
  • Nano380
  • ANDREIA GERNISKI MACEDO
  • WILSON JOSE DA SILVA
  • Ana Flavia Nogueira
Modality
Pôster
Subject area
Síntese e caracterização de materiais
Publishing Date
12/12/2023
Country of Publishing
Brasil
Language of Publishing
Inglês
Paper Page
https://www.even3.com.br/anais/workshop-do-ineo-2023/613100-monitoring-the-segregation-of-the-litfsi-additive-in-spiro-ometad-layer
ISBN
978-65-272-0088-8
Keywords
LiTFSI, spiro-OMeTAD, stability
Summary
Perovskite solar cells exhibit interesting optical and electronic characteristics that improved the efficiency of these devices in just a few years, comparing with other photovoltaic technologies. The organic molecule 2, 2', 7, 7' - Tetrakis - (N, N - di - 4 - methoxyphenylamino) -9, 9' - spirobifluorene, named Spiro-OMeTAD, is widely used as hole-transport material in high performance perovskite solar cells. However, the poor electrical characteristics such as conductivity and hole mobility of pristine spiro-OMeTAD leads to the use of additives such as bis(trifluoromethane)sulfonimide lithium salt (LiTFSI) that act as a p-type dopant, improving the oxidation process in the layer. Nevertheless, LiTFSI has a hygroscopic effect [1] that contributes to the degradation of perovskite solar cells (PSCs) due the comportment of these devices in wet environments. Furthermore, it is known that LiTFSI suffer an effect of the segregation to the top surface of spiro-OMeTAD, in a process that depends on the time exposure in air ambient. Therefore, the use of spiro-OMeTAD as hole-transport material in perovskite solar cells depends of the use of additives to improve the charge transport parameters, even if reduces the time of operation in air-ambient. Aiming to provide insights about the degradation process in PSCs with spiro-OMeTAD dopped with LiTFSI, this work shows the relationship between the segregation of LiTFSI and the degradation of these devices when exposure in air-ambient through electrical characterization and morphological analyses using atomic force microscopy analysis. The results indicate that the segregation of the additive LiTFSI increases with the aging time in air-ambient, mainly after 72h of exposure. Simultaneously, an improvement was seen in series and shunt resistance due to the oxidation process of spiro-OMeTAD. This improvement was observed in the electrical characterization, with the power conversion efficiency (PCE) of 16.96% and 18.7% from fresh and after 48 h, respectively. After 96 h, the PCE was reduced to 15.78%, suggesting a relation between the photovoltaic performance and segregation of the additive. These results suggest that oxidation is a competitive process with the segregation of the additive onto the surface of spiro-OMeTAD. [1] N.A.N. Ouedraogo, G.O. Odunmbaku, B. Guo, S. Chen, X. Lin, T. Shumilova, K. Sun, Oxidation of Spiro-OMeTAD in High-Efficiency Perovskite Solar Cells, ACS Appl Mater Interfaces. 14 (2022) 34303–34327. https://doi.org/10.1021/acsami.2c06163. Acknowledgements This study was financed in part by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. The authors also acknowledge the CINE (Center for Innovation on new Energies), INEO (Instituto Nacional de Eletrônica Orgânica) - Instituto de Física de São Carlos, NANOTEC - NEO (Laboratório de Nanotecnologia Aplicada) - Universidade Tecnológica Federal do Paraná, FOTONANOBIO - UTFPR and LAMAQ - Universidade Tecnológica Federal do Paraná (Laboratório Multiusuário de Análises Químicas) by AFM (Atomic Force Microscope) facility.
Title of the Event
Workshop do INEO 2023
City of the Event
Nazaré Paulista
Title of the Proceedings of the event
Anais do Workshop INEO 2023
Name of the Publisher
Even3
Means of Dissemination
Meio Digital

How to cite

ROSA, Eduardo Henrique dos Santos et al.. MONITORING THE SEGREGATION OF THE LITFSI ADDITIVE IN SPIRO-OMETAD LAYER.. In: Anais do workshop INEO 2023. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2023. Available in: https//www.even3.com.br/anais/workshop-do-ineo-2023/613100-MONITORING-THE-SEGREGATION-OF-THE-LITFSI-ADDITIVE-IN-SPIRO-OMETAD-LAYER. Access in: 14/10/2024

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