Visualizing the role of photoinduced ion migration on photoluminescence in halide perovskite grains

Choi, Ho Yeon; Ke, Jack Chun-Ren; Skalsky, Stefan; Castle, Christopher A.; Li, Kexue; Moore, Katie L.; Flavell, Wendy R.; Parkinson, Patrick

doi:10.1039/d0tc01441a

Cited by 22 publications

(10 citation statements)

References 53 publications

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“…Presence of PbI 2 within the MAPI microstructure has been known to have this effect. [ 34 ] However, while this may be true of control B, E is further blue‐shifted in the flight sample, which has far fewer dark regions. The distribution of charge recombination lifetime τ, measured over the same area and extracted from exponential fits to time‐resolved PL data, follow a similar trend: recombination occurs faster on average in the flight sample than in either control.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Hybrid Perovskite Prototypes After 10‐Month Space Flight on the International Space Station

Delmas

Erickson

Arteaga

et al. 2023

Advanced Energy Materials

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are driven by human life support systems, scientific exploration and Earth observation equipment, telecommunications, and electric propulsion systems. There is great interest in highly efficient perovskite-structured thin-film solar cells for space applications. [1,2] These are promising candidates due to their excellent optoelectronic characteristics, low-cost, high performance, [2][3][4] and their facile manufacturability [5] potentially suitable for in-space manufacturing. [6] These traits coupled with their defect tolerance, [7,8] and radiation tolerance [9] have garnered interest for aerospace applications. Prior to the widespread implementation of metal halide perovskites (MHPs) into the space environment, solar cells must pass rigorous American Institute of Aeronautics and Astronautics Standard 111 (AIAA-S111) space qualification testing. [10] Low earth orbit (LEO), 160-2000 km above the Earth's surface, is an ideal place to operate MHPs either on the International Space Station or on satellites. The harsh environment of LEO includes thermal cycling (±120 ⁰C), vacuum (10 −6 -10 −9 torr), ultra-violet radiation, exposure to atomic oxygen (flux 10 13 -10 15 AO/cm 2 with collision energy of 5 eV), plasma (10 6 cm −3 , ≤1 eV electron temperature), and ionizing radiation of electrons, protons, micrometeoroids (60 km s −1 ) and orbital debris (10 km s −1 ). [11] We must demonstrate MHP durability in relevant space environments to evidence feasibility. Implementing Metal halide perovskites (MHPs) have emerged as a prominent new photovoltaic material combining a very competitive power conversion efficiency that rivals crystalline silicon with the added benefits of tunable properties for multijunction devices fabricated from solution which can yield high specific power. Perovskites have also demonstrated some of the lowest temperature coefficients and highest defect tolerance, which make them excellent candidates for aerospace applications. However, MHPs must demonstrate durability in space which presents different challenges than terrestrial operating environments. To decisively test the viability of perovskites being used in space, a perovskite thin film is positioned in low earth orbit for 10 months on the International Space Station, which was the first long-duration study of an MHP in space. Postflight high-resolution ultrafast spectroscopic characterization and comparison with control samples reveal that the flight sample exhibits superior photo-stability, no irreversible radiation damage, and a suppressed structural phase transition temperature by nearly 65 K, broadening the photovoltaic operational range. Further, significant photo-annealing of surface defects is shown following prolonged light-soaking postflight. These results emphasize that methylammonium lead iodide can be packaged adequately for space missions, affirming that space stressors can be managed as theorized.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Hybrid Perovskite Prototypes After 10‐Month Space Flight on the International Space Station

Delmas

Erickson

Arteaga

et al. 2023

Advanced Energy Materials

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“…The photobrightening effect has been shown in a number of reports. [ 48 , 56 , 57 ] This effect was considered to be induced by the migration/interdiffusion of different halides. [ 58 , 59 , 60 ] As iodine has a lower ionic migration activation energy than bromine, its migration rates surpass bromine in the illuminated area.…”

Section: Resultsmentioning

confidence: 99%

Beyond the Phase Segregation: Probing the Irreversible Phase Reconstruction of Mixed‐Halide Perovskites

Zheng

Xiao

et al. 2021

Advanced Science

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Mixed-halide perovskites can undergo a photoinduced phase segregation. Even though many reports have claimed that such a phase segregation process is reversible, what happens after phase segregation and its impact on the performance of perovskite-based devices are still open questions. Here, the phase transformation of MAPb(I 1−x Br x ) 3 after phase segregation and probe an irreversible phase reconstruction of MAPbBr 3 is investigated. The photoluminescence imaging microscopy technique is introduced to in situ record the whole process. It is proposed that the type-I band alignment of segregated I-rich and Br-rich domains can enhance the emission of the I-rich domains by suppressing the nonradiative recombination channels. At the same time, the charge injection from Br-rich to I-rich domains drives the expulsion of iodide from the lattice, and thus triggers the reconstruction of MAPbBr 3 . The work highlights the significance of ion movements in mixed-halide perovskites and provides new perspectives to understand the property evolution.

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“…Choi et al used temporally, spatially, and spectrally resolved optical microscopy to study the ion diffusion process from the perovskite interface to the bulk. 52 The results show that higher oxygen content together with the migration of iodine ions driven by light cures the initially defective crystal structure, and thus it enhances the internal quantum efficiency. Similar device behavior has been observed in the mesoporous carbon-based PSCs with 5-aminovaleric acid iodide (AVA) as additive.…”

Section: Ion Migrationmentioning

confidence: 94%

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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Visualizing the role of photoinduced ion migration on photoluminescence in halide perovskite grains

Abstract: By combining in situ optical spectroscopy with a high spatial resolution mass spectrometry, we directly link the evolution in carrier recombination processes in perovskite films to light-induced ion migration.

Cited by 22 publications

References 53 publications

Evaluation of Hybrid Perovskite Prototypes After 10‐Month Space Flight on the International Space Station

Evaluation of Hybrid Perovskite Prototypes After 10‐Month Space Flight on the International Space Station

Beyond the Phase Segregation: Probing the Irreversible Phase Reconstruction of Mixed‐Halide Perovskites

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

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