Stabilizing the MAPbI3 perovksite via the in-situ formed lead sulfide layer for efficient and robust solar cells

Xie, Lujia; Zhang, Taiyang; Zhao, Yixin

doi:10.1016/j.jechem.2019.11.023

Cited by 35 publications

(23 citation statements)

References 31 publications

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“… a All of the cells were constructed with a similar structure of passivation materials/perovskite crystals. ,− …”

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confidence: 99%

Efficient and Stable Perovskite Solar Cells with a Superhydrophobic Two-Dimensional Capping Layer

Shi

2021

J. Phys. Chem. Lett.

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A two-dimensional (2D) perovskite layer is considered to be a desirable defect passivation structure for the lifelong stability of perovskite solar cells (PSCs). However, the efficiency could be compromised behind the traditional PSCs. Herein, we solve this issue by employing a highly hydrophobic organic cation, 2-[4-(trifluoromethyl)phenyl]ethanamine (CF 3 -PEA), to form a 2D (CF 3 -PEA) 2 PbI 4 to effectively passivate the 3D MAPbI 3 with fewer defects. The new 2D/3D-structured PSCs show reduced charge recombination, an elongated carrier lifetime, efficient charge generation and transport. Those excellent characters lead to a significant enhancement of the efficiency from 17.9% for pristine PSCs to 21.43% for 2D/3D PSCs. Benefiting from the high hydrophobicity of CF 3 -PEA, the cells show remarkably improved stability by maintaining 83% of the original efficiency exposed to 80% R.H. and 50 °C for 600 h and 87% under 1 sun illumination for 600 h, which makes our PCSs among the most efficient and stable MAPbI3 solar cells.

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“… a All of the cells were constructed with a similar structure of passivation materials/perovskite crystals. ,− …”

mentioning

confidence: 99%

Efficient and Stable Perovskite Solar Cells with a Superhydrophobic Two-Dimensional Capping Layer

Shi

2021

J. Phys. Chem. Lett.

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“…The top surface of a Cs 0.25 FA 0.75 Pb(Br 0.20 I 0.80 ) 3 perovskite film is converted to PbS via a solution-based treatment adapted from literature and described in the Experimental Methods section. 45 X-ray photoelectron spectroscopy (XPS) is used to confirm the formation of PbS at the sample surface. Figure 1a shows the emergence of a doublet corresponding to the S 2p core level following a treatment with 0.050 wt % (NH 4 ) 2 S solution.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…PbS thin films and quantum dots have previously been reported as interfacial and passivation layers in perovskite solar cells. 45,46 We chose to study a Cs 0.25 FA 0.75 Pb-(Br 0.20 I 0.80 ) 3 perovskite composition (1.68 eV direct electronic band gap) because of its good thermal stability at ALD processing temperatures and its applicability as the wide band gap absorber in tandem solar cells. 12,25 X-ray diffraction and photoelectron spectroscopy are used to characterize the structure and composition of the perovskite surface before and after ALD processing.…”

Section: ■ Introductionmentioning

confidence: 99%

“…We use a facile solution treatment with ammonium sulfide ((NH 4 ) 2 S) to convert the top surface of Cs 0.25 FA 0.75 Pb(Br 0.20 I 0.80 ) 3 films into a thin lead sulfide (PbS) overlayer. PbS thin films and quantum dots have previously been reported as interfacial and passivation layers in perovskite solar cells. , We chose to study a Cs 0.25 FA 0.75 Pb(Br 0.20 I 0.80 ) 3 perovskite composition (1.68 eV direct electronic band gap) because of its good thermal stability at ALD processing temperatures and its applicability as the wide band gap absorber in tandem solar cells. , X-ray diffraction and photoelectron spectroscopy are used to characterize the structure and composition of the perovskite surface before and after ALD processing. We find that the PbS overlayer partially protects the perovskite surface from oxidation upon direct exposure to the ALD tetrakis(dimethylamino)tin(IV) precursor in the first few cycles of SnO 2 film growth.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the Surface of Metal Halide Perovskites to Enable the Atomic Layer Deposition of Metal Oxide Contacts

Raiford

Chosy

Reeves

et al. 2021

ACS Appl. Energy Mater.

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Replacing organic contact layers with inorganic counterparts, such as metal oxides, is one strategy for improving long-term device stability in metal halide perovskite solar cells. Often, the methods used to deposit metal oxide thin films are incompatible with metal halide perovskites, creating challenges for the fabrication of contacts above the perovskite absorber layer. In this study, we utilize a one-step, solution treatment of the top surface of Cs0.25FA0.75Pb(Br0.20I0.80)3 to create a thin (∼1 nm) overlayer of lead sulfide (PbS) to protect the underlying perovskite during subsequent deposition. X-ray characterization of the surface region shows that the PbS overlayer limits undesirable changes to the perovskite structure and stoichiometry during atomic layer deposition (ALD) of SnO2. This protection enables ALD growth of SnO2 electron contacts on top of the perovskite without an organic transport layer (e.g., C60), resulting in a solar cell with a power conversion efficiency of 5.8%. This result is a marked improvement over devices with ALD SnO2 grown directly on the perovskite without a PbS overlayer, which produce no power output. The interface characterization and device results in this study highlight some of the key challenges associated with ALD metal oxide growth on perovskite materials and can help inform the future design of inorganic contact layer deposition in solar photovoltaic technologies.

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“…Recently, a series of modified approaches have been developed to address the above issues. [15][16][17][18][19][20][21] For instance, employing sulfate or phosphate ions to treat the surface of perovskite film yielded the lead oxysalt thin capping layer, thereby remarkably improving the environmental stability of PSCs. 22 The usage of phenethylammonium iodide to modify the perovskite films realized the fabrication of higher-efficiency PSCs by reducing the defects and suppressing nonradiative recombination.…”

Section: Introductionmentioning

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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Stabilizing the MAPbI3 perovksite via the in-situ formed lead sulfide layer for efficient and robust solar cells

Cited by 35 publications

References 31 publications

Efficient and Stable Perovskite Solar Cells with a Superhydrophobic Two-Dimensional Capping Layer

Efficient and Stable Perovskite Solar Cells with a Superhydrophobic Two-Dimensional Capping Layer

Tailoring the Surface of Metal Halide Perovskites to Enable the Atomic Layer Deposition of Metal Oxide Contacts

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

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