Thioacetamide additive assisted crystallization of solution-processed perovskite films for high performance planar heterojunction solar cells

Cui, Can; Xie, Danyan; Lin, Ping; Hu, Haihua; Che, Siyuan; Xiao, Ke; Wang, Peng; Xu, Lingbo; Yang, Deren; Yu, Xuegong

doi:10.1016/j.solmat.2020.110435

Cited by 17 publications

(10 citation statements)

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“…Therefore, it is most likely that the peak associates with the characteristic stretching vibration of C = S bond from TAA. 25,29 Moreover, this peak shifts to 707 cm −1 when TAA and PbI 2 co-exist in DMF. In view of the fact that the perovskite film contains undersaturated lead, the shift of the C = S peak in TAA from 718 to 707 cm −1 suggests the coordination between Pb cations and S in TAA.…”

Section: Resultsmentioning

confidence: 93%

“…The results denote a new stretch peak appears at 718 cm −1 with the addition of TAA compared with pure DMF, while there is no peak located at 718 cm −1 with PbI 2 solely added to DMF. Therefore, it is most likely that the peak associates with the characteristic stretching vibration of C = S bond from TAA 25,29 . Moreover, this peak shifts to 707 cm −1 when TAA and PbI 2 co‐exist in DMF.…”

Section: Resultsmentioning

confidence: 97%

“…Cui et al introduced TAA to methylammonium lead iodide (CH 3 NH 3 PbI 3 , MAPbI 3 ) solution, and found that TAA could improve uniformity and grain size of the photoactive films, thus achieving the goal of the reduction of traps and boosting the PCE of PSCs. 25 26 Nevertheless, there is little research on TAA as an interfacial layer between TiO 2 and the perovskite layer.…”

Section: Introductionmentioning

confidence: 99%

“…Thioacetamide (CH 3 CSNH 2 , TAA) has been explored recently due to the accessibility and low cost, but TAA tends to be used as an additive of perovskite precursor. Cui et al introduced TAA to methylammonium lead iodide (CH 3 NH 3 PbI 3 , MAPbI 3 ) solution, and found that TAA could improve uniformity and grain size of the photoactive films, thus achieving the goal of the reduction of traps and boosting the PCE of PSCs 25 . Yu et al investigated the effect of TAA in PSCs by theoretical calculations, revealing that the S‐donor of TAA bonding with MAPbI 3 (110) could not only reduce work function but also passivate deep trap of the perovskite interface due to the formation of MAI·PbI 2 ·DMSO·TAA adducts 26 .…”

Section: Introductionmentioning

confidence: 99%

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A thioacetamide interlayer anchoring TiO₂ and (FAPbI₃)₁₋_x(MAPbBr₃)_x for high‐performance perovskite solar cells

et al. 2021

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In the perovskite solar cells (PSCs), traps of the perovskite film or interface are the research focus, which can severely hinder charge transfer and benefit charge recombination, thus weakening the photoelectric performance of the devices. Herein, a Thioacetamide (TAA) interfacial layer is used to passivate the traps of PSCs.Comparing to the control device (17.65%), the TAA-based solar cells can achieve an enhanced efficiency of 19.14%. It is found that the passivation caused by TAA occurs through the interactions of sulfur in TAA with undersaturated Pb in perovskite and Ti 4+ in TiO 2 , resulting in a faster and more efficient charge transfer and a greatly reduced trap density from 3.36 × 10 16 cm −3 to 1.93 × 10 16 cm −3 . It is shown that the modification method using TAA may be helpful for passivating traps and obtaining excellent photoelectric properties of PSCs.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A thioacetamide interlayer anchoring TiO₂ and (FAPbI₃)₁₋_x(MAPbBr₃)_x for high‐performance perovskite solar cells

et al. 2021

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“…Moreover, many other organosulfur derivatives were reported to form an adduct with PbI 2 as the Pb atom acts as the Lewis acid. One such example is a volatile Lewis base, thioacetamide (CH 3 CSNH 2 ), abbreviated as TAA [124]. Another example is 2-pyridylthiourea, which has an S donor from thiourea, with a better ability to coordinate with PbI 2 , and an N donor from pyridine, which can coordinate with PbI 2 as a Lewis acid base and regulate the co-ordination strength with PbI 2 .…”

Section: Oxygen-based Multifunctional Group Containing Additivesmentioning

confidence: 99%

The Progress of Additive Engineering for CH3NH3PbI3 Photo-Active Layer in the Context of Perovskite Solar Cells

Mangrulkar

Stevenson

2021

Crystals

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Methylammonium lead triiodide (CH3NH3PbI3/MAPbI3) is the most intensively explored perovskite light-absorbing material for hybrid organic–inorganic perovskite photovoltaics due to its unique optoelectronic properties and advantages. This includes tunable bandgap, a higher absorption coefficient than conventional materials used in photovoltaics, ease of manufacturing due to solution processability, and low fabrication costs. In addition, the MAPbI3 absorber layer provides one of the highest open-circuit voltages (Voc), low Voc loss/deficit, and low exciton binding energy, resulting in better charge transport with decent charge carrier mobilities and long diffusion lengths of charge carriers, making it a suitable candidate for photovoltaic applications. Unfortunately, MAPbI3 suffers from poor photochemical stability, which is the main problem to commercialize MAPbI3-based perovskite solar cells (PSCs). However, researchers frequently adopt additive engineering to overcome the issue of poor stability. Therefore, in this review, we have classified additives as organic and inorganic additives. Organic additives are subclassified based on functional groups associated with N/O/S donor atoms; whereas, inorganic additives are subcategorized as metals and non-metal halide salts. Further, we discussed their role and mechanism in terms of improving the performance and stability of MAPbI3-based PSCs. In addition, we scrutinized the additive influence on the morphology and optoelectronic properties to gain a deeper understanding of the crosslinking mechanism into the MAPbI3 framework. Our review aims to help the research community, by providing a glance of the advancement in additive engineering for the MAPbI3 light-absorbing layer, so that new additives can be designed and experimented with to overcome stability challenges. This, in turn, might pave the way for wide scale commercial use.

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Small Molecules with Controllable Molecular Weights Passivate Surface Defects in Air‐Stable p‐i‐n Perovskite Solar Cells

Hsu

Jiang

Lan

et al. 2021

Adv Elect Materials

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The passivation of surface defects at the interfaces and grain boundaries of perovskites has great potential to improve the optoelectronic properties of related devices. In this study, the small molecules LG0.5, LG1.5, and LG2.5—having precise and controllable molecular weights (various generations synthesized through click reactions) and featuring urethane, urea, and malonamide functionalities—are synthesized, and their ability to passivate the defects of perovskites are evaluated. X‐ray photoelectron spectroscopy, ultraviolet photoelectron spectroscopy, and time‐resolved photoluminescence spectroscopy are used to observe the interactions between the perovskites and these molecules. The embedding of LG0.5 promotes the growth of large‐grain perovskite crystals, leading to increases in the intensities of the UV–vis absorption and photoluminescence spectral signals of the perovskite as well as longer carrier lifetimes. A power conversion efficiency of almost 20% for a p‐i‐n perovskite solar cell having the layer structure indium tin oxide/NiOx/CH3NH3PbI3 (with LG0.5)/[6,6]‐phenyl C61 butyric acid methyl ester/bathocuproine/Ag is observed. This device (without encapsulation) exhibits excellent air‐stability, retaining 89.8% of its initial performance after storage in an ambient environment (25 °C, 40% humidity) for over 120 d.

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Thioacetamide additive assisted crystallization of solution-processed perovskite films for high performance planar heterojunction solar cells

Cited by 17 publications

References 39 publications

A thioacetamide interlayer anchoring TiO₂ and (FAPbI₃)₁₋_x(MAPbBr₃)_x for high‐performance perovskite solar cells

A thioacetamide interlayer anchoring TiO₂ and (FAPbI₃)₁₋_x(MAPbBr₃)_x for high‐performance perovskite solar cells

The Progress of Additive Engineering for CH3NH3PbI3 Photo-Active Layer in the Context of Perovskite Solar Cells

Small Molecules with Controllable Molecular Weights Passivate Surface Defects in Air‐Stable p‐i‐n Perovskite Solar Cells

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Thioacetamide additive assisted crystallization of solution-processed perovskite films for high performance planar heterojunction solar cells

Cited by 17 publications

References 39 publications

A thioacetamide interlayer anchoring TiO2 and (FAPbI3)1−x(MAPbBr3)x for high‐performance perovskite solar cells

A thioacetamide interlayer anchoring TiO2 and (FAPbI3)1−x(MAPbBr3)x for high‐performance perovskite solar cells

The Progress of Additive Engineering for CH3NH3PbI3 Photo-Active Layer in the Context of Perovskite Solar Cells

Small Molecules with Controllable Molecular Weights Passivate Surface Defects in Air‐Stable p‐i‐n Perovskite Solar Cells

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Product

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A thioacetamide interlayer anchoring TiO₂ and (FAPbI₃)₁₋_x(MAPbBr₃)_x for high‐performance perovskite solar cells

A thioacetamide interlayer anchoring TiO₂ and (FAPbI₃)₁₋_x(MAPbBr₃)_x for high‐performance perovskite solar cells