Ionic Liquid Treatment for Highest‐Efficiency Ambient Printed Stable All‐Inorganic CsPbI<sub>3</sub> Perovskite Solar Cells

Du, Yachao; Tian, Qingwen; Chang, Xiaoming; Fang, Junfei; Gu, Xiaojing; He, Xilai; Ren, Xiaodong; Zhao, Kui; Liu, Shengzhong

doi:10.1002/adma.202106750

Cited by 125 publications

(98 citation statements)

References 47 publications

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“…Du et al introduced an ionic liquid, 1-ethyl-3-methylimidazolium hydrogen sulfate ([EMIM] + [HSO 4 ] − ), into perovskite (CsPb(I,Br) 3 ) precursor solution to fabricate high-quality films with few defects and an appropriate interfacial energy alignment. 32 They claimed that there are strong coordination interactions between [EMIM] + [HSO 4 ] − and under-coordinated Pb 2+ , which can effectively passivate the iodine vacancies and reduce the trap density in perovskite films. Besides, the interfacial passivation between the carrier transport layer and perovskite layer is also a proven significant strategy to reduce defect density and improve interface contact.…”

Section: Introductionmentioning

confidence: 99%

Sulfonyl passivation through synergistic hydrogen bonding and coordination interactions for efficient and stable perovskite solar cells

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Sulfonyl passivation through synergistic hydrogen bonding and coordination interactions for efficient and stable perovskite solar cells

et al. 2022

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“…The results showed that the PCE of CsPbI 3 solar cells was as high as 20.01%. [95] The phase instability and high annealing temperature of device fabrication are also among the factors limiting the commercial application of inorganic hybrid halide PSC. The annealing temperature of solution derived inorganic hybrid halide perovskite thin films is generally as high as 250 °C.…”

Section: Passivation By Lewis Basementioning

confidence: 99%

Recent Progress on Defect Passivation of All‐Inorganic Halide Perovskite Solar Cells

Wang

Yin

Iqbal

et al. 2022

Adv Materials Inter

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high charge mobility and higher power conversion efficiency (PCE). [1][2][3][4][5] Nowadays, the maximum PCE of organic-inorganic hybrid perovskite solar cells (PSCs) has exceeded 25%. [6][7][8] However, organic cations in organic-inorganic hybrid perovskite materials are susceptible to volatilization by light, heat and other environmental factors, which severely impairs the performance and stability of the devices and hinders their maximum commercial utilization, [9][10][11] while all-inorganic perovskite exhibits excellent thermal and photostability due to the absence of unstable organic cations. Therefore, the development of all-inorganic PSCs is promising to consider the long-term application of the devices on the commercialization path. In recent years, more and more efforts have been focused on the performance enhancement of all-inorganic PSCs, and the PCEs have increased from 2.9% in 2015 to 21.0% in 2022. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] To better visualize the development of defect passivation strategies for all-inorganic PSCs, we have drawn the efficiency development diagram for the all-inorganic halide PSCs including devices based on pure CsPbI 3 , CsPbBr 3 , and CsPbI 3−x Br x . Besides, the number of publications of these PSCs in recent years is also summarized. (Figure 1a,b).The different halide contents make all-inorganic perovskite (CsPbX 3 ) each have distinct advantages as well as disadvantages. For example, black cubic phase α-CsPbI 3 with a bandgap of 1.73 eV, achieved the highest PCE (21.0%) among all kinds of CsPbX 3 solar cells, [28] but it is effortless to transform rapidly to tetragonal phase β-CsPbI 3 (E g = 2.82 eV) under atmospheric humidity (room temperature), or even to yellow δ non-perovskite phase. CsPbI 3 perovskite is a yellow hexagonal δ-phase at room temperature, which is not suitable for photovoltaic applications. However, the photoactive black cubic phase CsPbI 3 can only keep stable at high temperature of above 300 °C. Although it has been recently reported that doping inside CsPbI 3 perovskite pseudohalide (SCN − ) can enhance the phase stability and device performance of CsPbI 3 , the preparation temperature is still as high as 180 °C. [29] Generally, the phase stability of CsPbI3 still is an important problem that needs to be solved.Compared to CsPbI 3 , CsPbBr 3 exhibits excellent humidity and thermal stability; nevertheless, its large band gap (E g = 2.30 eV), limits the corresponding devices only absorb photons with a maximum wavelength of 540 nm. [30] Therefore, All-inorganic halide perovskite materials have attracted increasing attentions in recent years due to their superior stability and adjustable band gap which make them very suitable for the top cells of multi-junction solar cells. Nonetheless, the power conversion efficiency of all-inorganic halide perovskite solar cells is still far from satisfaction. The widespread use of the conventional solution method in the preparation process causes many different defects and carrier t...

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“…In addition, the ionic liquid effectively regulates the crystal growth of perovskite through the formation of PbI 2 ‐EMIMHSO 4 intermediate, which ultimately increases the grain size, reduces the defect density, and alleviates the lattice strain. [ 58 ] The 1‐viny‐3‐propionate ethyl imidazolium chloride ([PEVIM]Cl) is applied to modify the CsPbI 2 Br film surface, yielding a compact film with enhanced crystallinity. The carbonyl group of [PEVIM]Cl effectively passivated uncoordinated metal cations on the surface, leading to suppressing charge recombination and improving charge transport.…”

Section: Interface Modifiersmentioning

confidence: 99%

Section: Interface Modifiersmentioning

confidence: 99%

Organic Molecules in All‐Inorganic CsPbI_xBr_3−xPerovskite Solar Cells: Interface Modifiers or Precursor Additives

Chai

Chang

Zhang

et al. 2022

Adv Energy and Sustain Res

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Figure 10. a) Schematic diagram of the controlled and optimized crystallization process. Reproduced with permission. [125] Copyright 2022, Elsevier. b) Schematic process of the increased number of colloids mediated by PEG additive. Reproduced with permission. [128] Copyright 2019, Elsevier. c) The schematic process for the formation of the CsPbBr 3 via the one-step spin-coating process. Reproduced with permission. [129] Copyright 2020, Elsevier. d) The proposed mechanism for the elimination of phase segregation in CsPbI 2 Br film by PMMA. Reproduced with permission. [131] Copyright 2021, Chinese Institute of Electronics. e) The schematic illustration of the formation process for PEG: CsPbIBr 2 . Reproduced with permission. [130] Copyright 2020, Wiley-VCH. Figure 9. Schematic diagram of perovskite precursor solution with HEMA. Molecular chemical structure of HEMA additive and polymerization reactions during high-temperature annealing. Schematic representation of the presence of HEMA hydrophobic polymers at GBs. Reproduced with permission. [121]

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Ionic Liquid Treatment for Highest‐Efficiency Ambient Printed Stable All‐Inorganic CsPbI₃ Perovskite Solar Cells

Cited by 125 publications

References 47 publications

Sulfonyl passivation through synergistic hydrogen bonding and coordination interactions for efficient and stable perovskite solar cells

Sulfonyl passivation through synergistic hydrogen bonding and coordination interactions for efficient and stable perovskite solar cells

Recent Progress on Defect Passivation of All‐Inorganic Halide Perovskite Solar Cells

Organic Molecules in All‐Inorganic CsPbI_xBr_3−xPerovskite Solar Cells: Interface Modifiers or Precursor Additives

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Ionic Liquid Treatment for Highest‐Efficiency Ambient Printed Stable All‐Inorganic CsPbI3 Perovskite Solar Cells

Cited by 125 publications

References 47 publications

Sulfonyl passivation through synergistic hydrogen bonding and coordination interactions for efficient and stable perovskite solar cells

Sulfonyl passivation through synergistic hydrogen bonding and coordination interactions for efficient and stable perovskite solar cells

Recent Progress on Defect Passivation of All‐Inorganic Halide Perovskite Solar Cells

Organic Molecules in All‐Inorganic CsPbIxBr3−xPerovskite Solar Cells: Interface Modifiers or Precursor Additives

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Product

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Ionic Liquid Treatment for Highest‐Efficiency Ambient Printed Stable All‐Inorganic CsPbI₃ Perovskite Solar Cells

Organic Molecules in All‐Inorganic CsPbI_xBr_3−xPerovskite Solar Cells: Interface Modifiers or Precursor Additives