Highly efficient flexible MAPbI<sub>3</sub> solar cells with a fullerene derivative-modified SnO<sub>2</sub> layer as the electron transport layer

Zhong, Meiyan; Liang, Yongqi; Zhang, Jianqi; Wei, Zhixiang; Li, Qi; Xu, Dongsheng

doi:10.1039/c9ta00398c

Cited by 81 publications

(59 citation statements)

References 44 publications

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“…3a). The C 60 derivative used here was C 60 pyrrolidine tris-acid (CPTA) because this material has the ability to form strong chemical bonding with the SnO 2 surface 40,41 and to behave as a good electron acceptor. The CPTA-SAM was formed on the SnO 2 surface by spin coating from N,N-dimethylformamide (DMF) solution.…”

Section: Resultsmentioning

confidence: 99%

Hysteresis-less and stable perovskite solar cells with a self-assembled monolayer

et al. 2020

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Organic-inorganic halide perovskites are promising for use in solar cells because of their efficient solar power conversion. Current-voltage hysteresis and degradation under illumination are still issues that need to be solved for their future commercialization. However, why hysteresis and degradation occur in typical perovskite solar cell structures, with an electron transport layer of metal oxide such as SnO 2 , has not been well understood. Here we show that one reason for the hysteresis and degradation is because of the localization of positive ions caused by hydroxyl groups existing at the SnO 2 surface. We deactivate these hydroxyl groups by treating the SnO 2 surface with a self-assembled monolayer. With this surface treatment method, we demonstrate hysteresis-less and highly stable perovskite solar cells, with no degradation after 1000 h of continuous illumination.

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Section: Resultsmentioning

confidence: 99%

Hysteresis-less and stable perovskite solar cells with a self-assembled monolayer

et al. 2020

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“…In fact, some groups have already tried to modify SnO 2 with fullerenes and have achieved improvements on device performance . For instance, Jen and coworkers reported a strategy using a C 60 ‐SAM modified SnO 2 film in PSCs and obtained a PCE of 15% with negligible hysteresis .…”

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confidence: 99%

Interfacial Bridge Using a cis‐Fulleropyrrolidine for Efficient Planar Perovskite Solar Cells with Enhanced Stability

Tian

Lin

et al. 2019

Small Methods

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Fullerene derivatives, especially after purposely functionalization, have potential to efficiently passivate interfacial defects between perovskites and electron transport layers. In this work, a fullerene derivative with amine functional group, 2,5‐diphenyl C60 fulleropyrrolidine (DPC60), is synthesized and employed as an interfacial layer between a perovskite and SnO2 in planar perovskite solar cells (PSCs). The cis‐configuration and the specific amine group of DPC60 effectively enhance the chemical interaction between the perovskite and DPC60, promoting the passivation of perovskite defects at the interface. The suitable energy level of DPC60 and the improved conductivity of the SnO2/DPC60 film facilitate the electron extraction from the perovskite layer. As a result, PSCs incorporated with DPC60 reach a PCE of 20.4% with high reproducibility, which is much higher than that of the bare SnO2 based devices (18.8%). Furthermore, the hydrophobic DPC60 layer suppresses heterogeneous nucleation and improves the crystallinity of the perovskite film, resulting in better device stability, retaining 82% of its initial efficiency after 200 h of 1 sun continuous irradiation and thermal ageing (55 ± 5 °C).

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“…The detailed Sn 3d XPS spectra for both SnO 2 NC and I‐SnO 2 thin films are shown in Figure e. The binding energy of Sn 3d slightly shifted to higher energy for the I‐SnO 2 sample, indicating the existence of additional negative charge surrounding Sn ions . The residual Cl in the amorphous phase SnO x can provide extra electrons toward the uncoordinated Sn at the SnO 2 NC surface, thus efficiently passivating the widespread oxygen vacancy defects.…”

Section: Resultsmentioning

confidence: 99%

Interconnected SnO₂ Nanocrystals Electron Transport Layer for Highly Efficient Flexible Perovskite Solar Cells

Sun

Gong

et al. 2019

Solar RRL

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This study reports on interconnected SnO2 electron transport layers (composed of presynthesized SnO2 nanocrystals interconnected by amorphous phase SnOx) processed at low temperature (120 °C) for highly efficient flexible perovskite solar cells. Herein, the amorphous phase SnOx serves as an effective binder to connect the SnO2 nanocrystals to obtain ultra‐smooth electron transport layers. Further characterization of the charge carrier kinetics at the perovskite/electron transport layer interface confirms that the interconnected SnO2 nanocrystals layer facilitates electron extraction and retards nonradiative charge carrier recombination. Consequently, a power conversion efficiency of 16.29% is achieved for flexible perovskite solar cells using the interconnected SnO2 electron transport layer on indium tin oxide/polyethylene terephthalate substrates.

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Highly efficient flexible MAPbI₃ solar cells with a fullerene derivative-modified SnO₂ layer as the electron transport layer

Abstract: Specific point was achieved for flexible MAPbI3 solar cells with CPTA modified SnO2 ETL.

Cited by 81 publications

References 44 publications

Hysteresis-less and stable perovskite solar cells with a self-assembled monolayer

Hysteresis-less and stable perovskite solar cells with a self-assembled monolayer

Interfacial Bridge Using a cis‐Fulleropyrrolidine for Efficient Planar Perovskite Solar Cells with Enhanced Stability

Interconnected SnO₂ Nanocrystals Electron Transport Layer for Highly Efficient Flexible Perovskite Solar Cells

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Highly efficient flexible MAPbI3 solar cells with a fullerene derivative-modified SnO2 layer as the electron transport layer

Abstract: Specific point was achieved for flexible MAPbI3 solar cells with CPTA modified SnO2 ETL.

Cited by 81 publications

References 44 publications

Hysteresis-less and stable perovskite solar cells with a self-assembled monolayer

Hysteresis-less and stable perovskite solar cells with a self-assembled monolayer

Interfacial Bridge Using a cis‐Fulleropyrrolidine for Efficient Planar Perovskite Solar Cells with Enhanced Stability

Interconnected SnO2 Nanocrystals Electron Transport Layer for Highly Efficient Flexible Perovskite Solar Cells

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Highly efficient flexible MAPbI₃ solar cells with a fullerene derivative-modified SnO₂ layer as the electron transport layer

Interconnected SnO₂ Nanocrystals Electron Transport Layer for Highly Efficient Flexible Perovskite Solar Cells