Significantly suppressing ion migration in metal halide perovskites via trace of multivalent interstitial doping

Zhao, Yepin; Yavuz, İlhan; Wang, Minhuan; Weber, Marc H.; Lee, Ju-Hong; Tan, Shaun; Huang, Tianyi; Meng, Dong; Wang, Rui; Xue, Jingjing; Lee, Sung‐Joon; Bae, Sang‐Hoon; Zhang, Anni; Han, Tae‐Hee; Zhou, Yifei; Bian, Jiming; Park, Nam‐Gyu; Lee, Jin Wook; Yang, Yang

doi:10.21203/rs.3.rs-803525/v1

Cited by 1 publication

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“…[100] Zhao et al revealed the effect of the valence state of interstitial cations on their inhibition of ion migration. [101] Through calculation, the interaction energy between Nd 3+ and the defect is the highest, and the interaction energies of Ca 2+ and Na + are slightly lower (Figure 7d). Considering the similar cation radius, the higher valence charge may contribute to the relatively strong interaction energy between Nd 3+ and the negatively charged intrinsic defects.…”

Section: Alkali Cationsmentioning

confidence: 95%

“…On the basis of the dominant role of ion migration at grain boundaries, it is crucial to suppress ion migration by passivating the defects at grain boundaries. [93][94][95][96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111][112] Liu et al proposed a strategy to passivate grain boundaries and inhibit ion migration by methimazole (MMI). [113] From the EDS results, it can be seen that the intensity of I in the initial aging device decreased from the HTL side to the ETL side, indicating that I migrated in the perovskite (Figure 9a).…”

Section: Grain Boundary Passivationmentioning

confidence: 99%

“…e,f) In situ PL images before and after applying an electric field of 150 mV µm −1 under 440 nm illumination for 5 and 10 min for the lateral device based on the reference film (e) and the film incorporated with 0.08% Nd 3+ (f). Reproduced with permission [101]. Copyright 2021, Nature.…”

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confidence: 99%

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Ion Migration in Organic–Inorganic Hybrid Perovskite Solar Cells: Current Understanding and Perspectives

Zhu

Wang

Zhang

et al. 2022

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shown that ion migration is an inherent property of perovskite. [8][9][10][11] When discussing perovskites, due to their soft lattice feature, weak chemical bonds and low defect formation energy are generally considered. For the ABX 3 perovskites, A-site ions (methylamium ions (MA + ) and formamidium ions (FA + )), B-site ions (lead ions (Pb 2+ ) and tin ions (Sn 2+ )), and X-site ions (iodide ions (I − ), bromide ions (Br − ), chloride ions (Cl − ), and other halogen ions) have low activation barrier and high diffusion coefficient. [3] These ionic defects within the lattice are easily activated to cause severe ion migration in the perovskite films under external factors. In fact, in addition to the internal ions of perovskite, ions introduced from the ambient atmosphere also have the potential to migrate. [12] To detect the effects of ion migration, abnormal phenomenon in perovskite were given attention. Snaith et al. first reported the abnormal photocurrent-voltage hysteresis phenomenon, which was that forward and reverse scan J-V curves can't overlap in PSCs. [13] Electric field-driven ion migration was considered to be the key factor to affect photocurrent hysteresis. Xiao et al. [14] reported the switchable photovoltaic effect in a plane heterojunction structure with symmetric electrodes, in which the current direction could be completely overturned. Ion migration was speculated to be the main cause. The reason for this inference is that the migration as well as the accumulation of ions can change the intrinsic electric field of the perovskite films, even causing local crystal structure changes, which in turn lead to further degradation of the PSCs and severely affect the operating stability. [15,16] Apart from these, ion migration can also cause slow photoconductivity response, halide redistribution, and segregation. [17] In order to push the commercialization step of PSCs, a clear understanding of the ion migration in OIHPs is meaningful and highly desired. Although some reports have reviewed the ion migration in OIHPs, [18][19][20] the explanation of the mechanisms behind ion migration is still incomplete and is usually introduced directly from theoretical calculations. Meanwhile, more reviews only focused on the ion migration in PSCs; ion migration in fact has profound implications for many other applications of perovskite materials, like photodetector, light emitting diodes, and random access memories. The use of low-dimensional materials to inhibit ion migration is an effective strategy, but the various species involved are not discussed in detail. What's more, the study of ion migration is quickly Organic-inorganic hybrid perovskite (OIHPs) solar cells are the most promising alternatives to traditional silicon solar cells, with a certified power conversion efficiency beyond 25%. However, the poor stability of OHIPs is one of the thorniest obstacles that hinder its commercial development. Among all the factors affecting stability, ion migration is prominent because it is unavoidable and intrinsic in OH...

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Section: Alkali Cationsmentioning

confidence: 95%