Electron-enriched thione enables strong Pb–S interaction for stabilizing high quality CsPbI<sub>3</sub> perovskite films with low-temperature processing

Xu, Xiaojia; Zhang, Hao; Li, Erpeng; Ru, Pengbin; Han, Chunchun; Chen, Zhenhua; Wu, Yongzhen; Tian, He; Zhu, Weihong

doi:10.1039/c9sc06574a

Cited by 31 publications

(22 citation statements)

References 44 publications

(57 reference statements)

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“…Possible Pb–S interactions between the perovskite surface and thiophene groups introduced in the HTM structure can lead to beneficial effects, in terms of modified electronic properties, improved charge mobility, and trap passivation in PSCs. [ 11,12 ] This motivated us to investigate the introduction of electron‐rich thienyl units at the periphery of the Ullazine core, either as the sole donor units or as π‐bridges between the Ullazine and additional diarylamine donors. Moreover, the additional installation of peripheral electron‐withdrawing substituents on the planar Ullazine core could provide tunable HOMO–LUMO energy levels.…”

Section: Introductionmentioning

confidence: 99%

Molecular Engineering of Thienyl Functionalized Ullazines as Hole‐Transporting Materials for Perovskite Solar Cells

et al. 2021

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Organic hole‐transporting materials (HTMs) based on the Ullazine core yield so far only moderate power conversion efficiencies of up to 13.08% in perovskite solar cells (PSCs). Aiming to fabricate efficient and stable PSCs, novel Ullazine derivatives bearing thiophene units were designed and synthesized, allowing modulation of the electronic states of the HTMs and further providing defect passivation of the perovskite surface. Experimental and theoretical analysis show that thiophene units with ‐N(p‐MeOC6H4)2 groups improve the conductivity of Ullazine HTMs, boosting the efficiency of PSCs to 20.21%. This value is the highest reported to date for Ullazine‐based HTMs, and is close to the performance of Spiro‐OMeTAD. In addition, unencapsulated PSCs based on the champion Ullazine exhibit superior stability with respect to Spiro‐OMeTAD, retaining nearly 90% of the initial efficiency following 1000 h aging, which is ascribed to a combination of higher water repellency and passivation of defects on the perovskite surface. This work demonstrates the high potential of HTMs based on Ullazine core as substitutes to Spiro‐OMeTAD.

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Section: Introductionmentioning

confidence: 99%

Molecular Engineering of Thienyl Functionalized Ullazines as Hole‐Transporting Materials for Perovskite Solar Cells

et al. 2021

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“…To understand how CuP functionalizes the perovskite film surface, Raman spectroscopy tests were performed and shown in Figure 2f. The appearance of new peaks for the CuP-treated perovskite sample at 415, 748, and 816 cm −1 assigned to the Pb-S bond [35][36][37] indicates that the thiol in CuP can react with the surficial Pb ion from the perovskite film. It can be concluded that the CuP molecules anchor on the perovskite surface by forming interfacial Pb-S bonds between perovskite and CuP.…”

Section: Perovskite Surface Modification With Cup By Forming Interfacial Pb-s Bondsmentioning

confidence: 99%

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

Xiao

Wang

et al. 2021

CCS Chem

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The formation of undersaturated lead or iodide ions and I 2 on the perovskite surface can decrease the performance and stability of perovskite solar cells (PSCs). Additionally, the leakage of noxious lead limits the application of PSCs. Here, we develop a strategy for molecular modulation of a perovskite surface using thiol copper(II) porphyrin (CuP) to post-treat the perovskite film. The Raman spectra reveal that the CuP molecules anchor on the perovskite surface by a coordination interaction between the thiol-terminal of CuP and Pb ion in perovskite. DFT calculations demonstrate that the porphyrin core in CuP has a strong fixing effect on I − and I 2 by the induction force and electrostatic attraction. Such a fixation was demonstrated by the shift of the UV absorption peak of I 2 in solution with the addition of CuP and the decreased defects density in the CuP-treated perovskite film. Finally, the modified PSCs exhibit an improved cell performance with the best efficiency up to 21.76% (certified 20.97%). The modified PSCs acquired significantly improved stability. In addition, there is almost no lead leakage from the treated film immersed in water. This work provides a surface modulation strategy by thiol CuP treatment to fabricate efficient, stable, and environmental-friendly PSCs.

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“…The use of HI or HPbI 3 as a precursor in the method of obtaining one and two steps, has been shown to improve the stability of the active phase of perovskite CsPbI 3 and allow it to be obtained at lower temperatures [25], XIANG et al, reported obtaining CsPbI 3 using HI as a catalyst, which allowed the generation of stable perovskite for 2 months and 300 hours under irradiation, using carbon as the conductive electrode [98]. In the work reported by XU et al, they use 4 (1H) -pyridinethione as an additive to promote crystallization through the interaction of S-Pb, which allows obtaining this α-cubic perovskite at low temperature (90-100 ° C) and keep it stable for 20 days, with a cell efficiency of 85%, compared to the first day of testing [115].…”

Section: Cspbi3 Perovskitementioning

confidence: 99%

ABX3 inorganic halide perovskites for solar cells: chemical and crystal structure stability

et al. 2021

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Solar energy is one of the most promising and developed technologies in recent years, due to its high efficiency and low cost. Perovskite-type solar cells have been the focus of attention by the world scientific community. The main objective of this article is to present an (PSCs) analysis of the various investigations reported on the development of ABX3 inorganic halide perovskite-based solar cells, with emphasis in the effect that temperature and humidity have on their chemical and crystal structure stability. The main methods that are used to obtain ABX3 inorganic halide perovskites are also presented and analyzed. An analysis about the structure of these photovoltaic cells and how to improve their efficiency (PCS), fill factor (FF), short circuit current density (Jsc) and open circuit voltage (Voc) of these devices is presented. As a conclusion, a relationship of the methods, synthesis variables, and type of inorganic halide perovskite used for the development of devices with the best efficiencies is presented; the trends towards which this area of science is heading are also highlighted.

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Electron-enriched thione enables strong Pb–S interaction for stabilizing high quality CsPbI₃ perovskite films with low-temperature processing

Abstract: A neutral molecular additive of 4(1H)-pyridinethione (4-PT) is used for growing high quality black-phase CsPbI3 thin films at low temperatures.

Cited by 31 publications

References 44 publications

Molecular Engineering of Thienyl Functionalized Ullazines as Hole‐Transporting Materials for Perovskite Solar Cells

Molecular Engineering of Thienyl Functionalized Ullazines as Hole‐Transporting Materials for Perovskite Solar Cells

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

ABX3 inorganic halide perovskites for solar cells: chemical and crystal structure stability

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Electron-enriched thione enables strong Pb–S interaction for stabilizing high quality CsPbI3 perovskite films with low-temperature processing

Abstract: A neutral molecular additive of 4(1H)-pyridinethione (4-PT) is used for growing high quality black-phase CsPbI3 thin films at low temperatures.

Cited by 31 publications

References 44 publications

Molecular Engineering of Thienyl Functionalized Ullazines as Hole‐Transporting Materials for Perovskite Solar Cells

Molecular Engineering of Thienyl Functionalized Ullazines as Hole‐Transporting Materials for Perovskite Solar Cells

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

ABX3 inorganic halide perovskites for solar cells: chemical and crystal structure stability

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Electron-enriched thione enables strong Pb–S interaction for stabilizing high quality CsPbI₃ perovskite films with low-temperature processing