Journal
NANO TODAY
Volume 43, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.nantod.2022.101407
Keywords
TiO2 NTs; Substitutional Ta doping; Electron transport materials; Charge carrier trap states; Double-photon absorption
Categories
Funding
- Basic Science Center Project of NSFC [51788104]
- National Natural Science Foundation of China [51761145045, 51531006, 51572148, 51701103]
- Italian Ministry of Foreign Affairs and International Cooperation (MAECI) [PGR05249]
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This paper introduces the use of fluorinated tantalum to improve the performance of nanotube materials, which has important application potential in perovskite solar cells.
Anatase-TiO2 nanotubes (A-TiO2 NTs) represent a great opportunity for the electron transport materials used in perovskite solar cells because of several intrinsic advantages, e.g. an improved light trapping effect, an inherent ion-blocking layer, a directed electron transmission channel without interfacial random scattering. Nevertheless, its severe double-photon absorption and charge carrier trap states badly jeopardize the stability and electron transport of the perovskite active layers (PALs) under visible light, representing a major obstacle for practical applications. In this paper, we introduce Ta to substitute Ti position in A-TiO2 NTs lattice through a simple fluorination process, and reveal its underneath mechanism on suppresing the abovementioned limiting factors of charge carrier trap states and double-photon absorption. Moreover, we use the effect of double-photon absorption of studied NTs to excite the photogenerated carriers under a modulated sinusoidal visible light with small amplitude, which can perturb the transport dynamics of photo-induced charge carriers and simulate the dynamic process of charge carriers at the interface between electron transport layer (ETL) and PALs in real time. These achievements highlight the unique potential of substitutional Ta doping for interfacing engineering of perovskite solar cells. (c) 2022 Elsevier Ltd. All rights reserved.
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