Ion migration drives self-passivation in perovskite solar cells and is enhanced by light soaking

Roose, Bart

doi:10.1039/d1ra01166a

Cited by 19 publications

(21 citation statements)

References 22 publications

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“…Previous studies demonstrated that, I − migration, which is one of the main phase‐instability causes, can be dramatically restricted by the reduction of the I − vacancy defects. [ 38 ] As discussed above, assisted by the intrinsic vacancy‐mediated iodide ion diffusion, during TEAI treatment, I − can go inside and make the I − vacancy defects being effectively passivated. Thus, after treatment, the crystal structure phase should become more stable.…”

Section: Discussionmentioning

confidence: 99%

Differentially Accelerated Electron and Hole Diffusion in MAPbI₃ Film Surface Treated by a Quaternary Ammonium Halide for High‐Efficiency Solar Cells

et al. 2022

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Surface treatment with moisture‐tolerant molecules is an effective approach for improving the long‐term stability of perovskite solar cells (PSCs), but may bring drawbacks to carrier dynamics and power conversion efficiency (PCE). Although PSCs with both high stability and PCE have been realized by specially designed molecules recently, the underlying mechanism boosting the superior PCE is still not clear, limiting the further optimization of the photovoltaic performances. Herein, by monitoring carrier dynamics in tetra‐ethyl ammonium iodine (TEAI)‐treated MAPbI3 using femtosecond transient reflectivity technique with the rationally selected pump‐probe wavelengths, the electron and hole diffusivities are found being 7 and 3 times faster than those in the pristine MAPbI3, respectively. The differentially enhanced electron and hole diffusivity and the associated charge separation might originate from TEAI, which can effectively passivate both the negatively and positively charged defects. This study indicates that quaternary ammonium halide might be an efficient tool for improving both moisture stability and PCE of perovskites due to its hydrophobic organic cations ready to anchor along the surface and anions with a deeper penetration.

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Section: Discussionmentioning

confidence: 99%

Differentially Accelerated Electron and Hole Diffusion in MAPbI₃ Film Surface Treated by a Quaternary Ammonium Halide for High‐Efficiency Solar Cells

et al. 2022

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“…Similarly, Roose and co-workers reported that a short light-soaking treatment after fabrication increases ion mobility, achieving self-passivation and the relaxation of strains, which led to improved performance for triple cation perovskites with different halide ratios. 38 Therefore, ion transfer has been widely recognized as one of the factors influencing LSE. We will then discuss different mechanisms associated with the ion migration, including cation, anions, and neutral molecules.…”

Section: Ion Migrationmentioning

confidence: 99%

Light Soaking Effects in Perovskite Solar Cells: Mechanism, Impacts, and Elimination

Lin

Yang

et al. 2023

ACS Appl. Energy Mater.

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Perovskites solar cells (PSCs) have been recognized as one of the most prospective photovoltaic technologies for their combined properties of simple fabrication process, low material cost, and remarkable power conversion efficiencies of over 25%. However, the instability and poor reliability of PSCs remain the major obstacles to their practical applications. Specifically, light-soaking effect (LSE), which refers to the fluctuations of photovoltaic parameters under light exposure, represents a critical factor limiting the accuracy and stability of device power output. However, great challenges still remain in understanding and modulating the LSE in PSCs. In this review, we discuss different transient behaviors associated with LSE, and summarize various physical mechanisms (such as light-induced ions migration, trap defect passivation, lattice expansion, and charge carrier accumulation) behind the LSE together with their impacts to the device performance. Moreover, we systematically review the recent advances in developing effective approaches and strategies to mitigate or eliminate the LSE in PSCs, including interfacial modification, material doping, and surface passivation. Finally, a perspective and outlook toward LSE-free PSCs are further provided. This review offers a deeper opinion of the LSE physics with further guidance on ways to optimize the photostability of PSCs.

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“…Under an electric field, positively charged point defects with low activation energy tend to move toward the cathode, while negatively charged defects diffuse to the anode [59,60]. The ion migration tendency is highly dependent on light and temperature [61][62][63]. In 2016, Xing et al found that the ion drift velocity of polycrystalline MAPbI 3 film under 1 sun was an order of magnitude higher than that under dark conditions [62].…”

Section: The Impact Of Defectsmentioning

confidence: 99%

“…The ion migration tendency is highly dependent on light and temperature [61][62][63]. In 2016, Xing et al found that the ion drift velocity of polycrystalline MAPbI 3 film under 1 sun was an order of magnitude higher than that under dark conditions [62]. This proved that illumination can greatly reduce the active energy of ion migration.…”

Section: The Impact Of Defectsmentioning

confidence: 99%

Recent Progress of Surface Passivation Molecules for Perovskite Solar Cell Applications

Zhao¹,

Zhang²,

Liu³

et al. 2023

Journal of Renewable Materials

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Due to the solution processable nature, the prepared perovskite films are polycrystalline with considerable number of defects. These defects, especially defects at interface accelerate the carrier recombination and reduce the carrier collection. Besides, the surface defects also affect the long-term stability of the perovskite solar cells (PVSCs). To solve this problem, surface passivation molecules are introduced at selective interface (the interface between perovskite and carrier selective layer). This review summarizes recent progress of small molecules used in PVSCs. Firstly, different types of defect states in perovskite films are introduced and their effects on device performance are discussed. Subsequently, surface passivation molecules are divided into four categories, and the interaction between the functional groups of the surface passivation molecules and selective defect states in perovskite films are highlighted. Finally, we look into the prospects and challenges in design noble small molecules for PVSCs applications.

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Ion migration drives self-passivation in perovskite solar cells and is enhanced by light soaking

Abstract: Ion migration can assist self-passivation and strain relaxation in lead halide perovskite films, while restriction of ion migration can lead to crack formation. Light soaking increases ion migration, allowing self-passivation and strain relaxation.

Cited by 19 publications

References 22 publications

Differentially Accelerated Electron and Hole Diffusion in MAPbI₃ Film Surface Treated by a Quaternary Ammonium Halide for High‐Efficiency Solar Cells

Differentially Accelerated Electron and Hole Diffusion in MAPbI₃ Film Surface Treated by a Quaternary Ammonium Halide for High‐Efficiency Solar Cells

Light Soaking Effects in Perovskite Solar Cells: Mechanism, Impacts, and Elimination

Recent Progress of Surface Passivation Molecules for Perovskite Solar Cell Applications

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Ion migration drives self-passivation in perovskite solar cells and is enhanced by light soaking

Abstract: Ion migration can assist self-passivation and strain relaxation in lead halide perovskite films, while restriction of ion migration can lead to crack formation. Light soaking increases ion migration, allowing self-passivation and strain relaxation.

Cited by 19 publications

References 22 publications

Differentially Accelerated Electron and Hole Diffusion in MAPbI3 Film Surface Treated by a Quaternary Ammonium Halide for High‐Efficiency Solar Cells

Differentially Accelerated Electron and Hole Diffusion in MAPbI3 Film Surface Treated by a Quaternary Ammonium Halide for High‐Efficiency Solar Cells

Light Soaking Effects in Perovskite Solar Cells: Mechanism, Impacts, and Elimination

Recent Progress of Surface Passivation Molecules for Perovskite Solar Cell Applications

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Differentially Accelerated Electron and Hole Diffusion in MAPbI₃ Film Surface Treated by a Quaternary Ammonium Halide for High‐Efficiency Solar Cells

Differentially Accelerated Electron and Hole Diffusion in MAPbI₃ Film Surface Treated by a Quaternary Ammonium Halide for High‐Efficiency Solar Cells