Lead and Iodide Fixation by Thiol Copper(II) Porphyrin for Stable and Environmental-Friendly Perovskite Solar Cells

Xiao, Guo‐Bin; Wang, Lu-Yao; Mu, Xijiao; Zou, Xiaoxin; Wu, Yiying; Cao, Jing

doi:10.31635/ccschem.021.202000516

Cited by 57 publications

(34 citation statements)

References 40 publications

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“…[ 17,18 ] Recently, considerable research efforts have been devoted to hindering the adverse diffusion of ions/molecules in PVSCs. For instance, interfacial barrier strategies of semimetal bismuth (Bi) interlayer, [ 19 ] naphthalene diimide derivative (NDI‐BN) organic interfacial layer, [ 20 ] and thiol copper (II) porphyrin (CuP) post‐treated layer [ 21 ] have been used as permeation barriers to inhibit the mutual migration of ions/molecules between the perovskite layer and transport layer. Regarding to intrinsic ion migration within perovskite materials, Saliba et al have adopted a compositional engineering to substitute the volatile MA + with FA + and Cs + compositions, which has effectively reduced the polarity and rotationality of organic cations, thereby alleviating the ion migration in perovskite.…”

Section: Introductionmentioning

confidence: 99%

Uncovering the Mechanism of Poly(ionic‐liquid)s Multiple Inhibition of Ion Migration for Efficient and Stable Perovskite Solar Cells

Yang

Sheng

et al. 2022

Advanced Energy Materials

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make it one of the most promising photovoltaic technologies. [1,2] Although such solar cells have been demonstrated with a certified power conversion efficiency (PCE) reaching 25.5% for laboratory scale devices, [3] successful commercialization of PVSCs still lacks mature large-area manufacturing technology and reliable long-term stability. [4] With the continuous improvement of printing technology, the fabrication of large-area perovskite photovoltaic devices has become possible and is expected to be compatible with industrial-level manufacturing in the coming future. [5,6] However, the intrinsic and extrinsic instabilities of PVSCs remain the tremendous hurdles on the road to commercialization.The photovoltaic performance of perovskite materials is vulnerable to operating environment. In general, the main degradation pathways of perovskite can be classified as two broad categories: one is susceptible to irreversible degradation under external environment stimulants (moisture, oxygen, heat, UV light, etc.) [7] and the other arises due to intrinsic defects caused by ion migration and organic cations or halide ions losses. [8] Generally speaking, aging degradation caused by hydration and oxidation (with assistance of external stress of moisture, oxygen, etc.) can be addressed with advanced encapsulation techniques. [9] However, numerous theoretical calculations and experimental observations document that the intrinsic ion migration phenomenon of hybrid perovskite materials cannot be avoided by encapsulation. [10,11] Thus far, almost all reported high-efficiency PVSCs are based on solution-prepared ionic polycrystalline perovskite absorbers, whose ionic characteristics make them prone to phase segregation, chemical degradation, and current-voltage hysteresis of devices, especially when suffering from illumination, heat, or external electric field. [12][13][14] Ironically, although the migratory ions can passivate the interface to promote carrier transport and collection in some special cases, it brings more serious hysteresis effects and stability issues in perovskite photovoltaic devices. [15,16] The problematics of the ion migration in perovskite can be ascribed to the lower activation energies (0.2-0.8 eV) of the organic and halide ions (e.g., MA + or I − ), which makes the ions

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Section: Introductionmentioning

confidence: 99%

Uncovering the Mechanism of Poly(ionic‐liquid)s Multiple Inhibition of Ion Migration for Efficient and Stable Perovskite Solar Cells

Yang

Sheng

et al. 2022

Advanced Energy Materials

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“…They are highly reactive to water and oxygen, thus inducing the degradation of the perovskite film and reducing the stability of PSCs [13–15] . These defects at grain boundaries acting as the recombination and trap‐state centers are detrimental for the cell performance [16–18] . Thus, effective management of perovskite grain boundaries is vitally important for maximizing the performance and stability of PSCs [19–21] …”

Section: Figurementioning

confidence: 99%

Homogeneously Large Polarons in Aromatic Passivators Improves Charge Transport between Perovskite Grains for >24 % Efficiency in Photovoltaics

Zhao

Wang

et al. 2022

Angew Chem Int Ed

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Aromatic passivators, such as porphyrin, with large π-backbones have attracted considerable attention to boost the charge carrier in polycrystalline perovskite films, thus enabling the fabrication of efficient and stable perovskite solar cells (PSCs). However, they often selfassemble into supramolecules that probably influence the charge-transfer process in the perovskite grain boundary. Here, by doping a monoamine Cu porphyrin into perovskite films, two porphyrin-based self-assembled supramolecules were successfully prepared between perovskite grains. Crystal structures and theoretical analyses reveal the presence of a stronger interaction between the amine units and the central Cu ions of neighbouring porphyrins in one of the supramolecules. This has a modified effect on the dipole direction of the porphyrins to be quantized as homogeneously large polarons (HLPs) in a periodic lattice. The porphyrin supramolecules can stabilize perovskite grain boundaries to greatly improve the stability of PSCs, while the HLPs-featured supramolecule facilitates hole transport across perovskite grains to remarkably increase the cell performance to as high as 24.2 %. This work proves that the modulation of the intermolecular interaction of aromatic passivators to yield HLPs is crucial for the cascaded acceleration of charge transport between perovskite grains. Organic-inorganic hybrid perovskite solar cells (PSCs)have attracted enormous attention because of their excellent power conversion efficiencies (PCEs) and low cost. [1][2][3][4] In recent years, the best PCE of PSCs has developed rapidly and has exceeded 25 %, approaching the single-junction Shockley-Queisser (SQ) limit. [5][6][7][8] A polycrystalline perovskite film fabricated by low-temperature solution-processed growth inevitably forms a large number of grain boundaries with a high defect density. [9][10][11][12] They are highly reactive to water and oxygen, thus inducing the degradation of the perovskite film and reducing the stability of PSCs. [13][14][15] These defects at grain boundaries acting as the recombination and trap-state centers are detrimental for the cell performance. [16][17][18] Thus, effective management of perovskite grain boundaries is vitally important for maximizing the performance and stability of PSCs. [19][20][21] A series of functional organic small molecules has been employed to passivate the perovskite defects and increase the performance and stability of PSCs. [22][23][24] However, these molecules have a high degree of volatility and high diffusion coefficients, resulting in poor stability under harsh environments, such as strong light, high temperature, and electric fields. [17,25] Stable aromatic passivators should be potential candidates to decorate perovskite films to promote the efficient charge transport across perovskite grains, [26][27][28][29][30][31] and/ or contribute to the surface band edges to influence the charge carrier dynamics, [32] thus leading to the fabrication of efficient and stable PSCs. It is worth noting that it is...

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“…This molecule stabilized the perovskite in water for five minutes without decomposing and dissolved in the form of perovskite instead of decomposing into lead iodide, thus minimizing Pb leakage. 33,34 Studies have shown that Pb leakage of the perovskite film encapsulated by porphyrin molecules was effectively reduced to 1.5 ppm after being immersed in water for 10 minutes, which was half that of the unencapsulated device. 35 In addition to introducing separated adsorption or barrier layers, Pb adsorption can also be realized by material functionalization.…”

Section: Chemisorption Layermentioning

confidence: 99%

Challenges of lead leakage in perovskite solar cells

Dou

Bai

Chen

2022

Mater. Chem. Front.

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Lead and Iodide Fixation by Thiol Copper(II) Porphyrin for Stable and Environmental-Friendly Perovskite Solar Cells

Cited by 57 publications

References 40 publications

Uncovering the Mechanism of Poly(ionic‐liquid)s Multiple Inhibition of Ion Migration for Efficient and Stable Perovskite Solar Cells

Uncovering the Mechanism of Poly(ionic‐liquid)s Multiple Inhibition of Ion Migration for Efficient and Stable Perovskite Solar Cells

Homogeneously Large Polarons in Aromatic Passivators Improves Charge Transport between Perovskite Grains for >24 % Efficiency in Photovoltaics

Challenges of lead leakage in perovskite solar cells

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