Thermally stable perovskite solar cells with efficiency over 21% <i>via</i> a bifunctional additive

Shi, Xiaoqiang; Wu, Yahan; Chen, Jieqiong; Cai, Molang; Yang, Yi; Liu, Xuepeng; Ye, Tao; Guli, Mina; Ding, Yong

doi:10.1039/d0ta01255f

Cited by 54 publications

(41 citation statements)

References 35 publications

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“…Therefore, treating the perovskite with DFPDA not only increases the defect formation energies but also increases the adsorption energies of H 2 O and O 2 molecules, which is undoubtedly beneficial to the stability of the hybrid PSCs. [ 19 ]…”

Section: Resultsmentioning

confidence: 99%

“…The resonance peaks appearing at δ ≈ 8.223 ppm for the NH bonds in DFPDA show a weak downfield chemical shift of Δδ ≈ 0.043 ppm after addition of PbI 2 , which may be evidence of the formation of a hydrogen bond (NH⋯I) between the DFPDA and PbI 2 . [ 19 ] XPS analysis is conducted to characterize the surface chemical states of perovskite films. A mixed‐cation lead iodide perovskite film is prepared by using a recipe of FA 0.85 MA 0.15 PbI 3 (where FA and MA denote formamidinium and methylammonium, respectively).…”

Section: Resultsmentioning

confidence: 99%

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Multifunctional Enhancement for Highly Stable and Efficient Perovskite Solar Cells

Cai

Cui

Chen

et al. 2020

Adv Funct Materials

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322

273

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With a certified efficiency as high as 25.2%, perovskite has taken the crown as the highest efficiency thin film solar cell material. Unfortunately, serious instability issues must be resolved before perovskite solar cells (PSCs) are commercialized. Aided by theoretical calculation, an appropriate multifunctional molecule, 2,2‐difluoropropanediamide (DFPDA), is selected to ameliorate all the instability issues. Specifically, the carbonyl groups in DFPDA form chemical bonds with Pb2+ and passivate under‐coordinated Pb2+ defects. Consequently, the perovskite crystallization rate is reduced and high‐quality films are produced with fewer defects. The amino groups not only bind with iodide to suppress ion migration but also increase the electron density on the carbonyl groups to further enhance their passivation effect. Furthermore, the fluorine groups in DFPDA form both an effective barrier on the perovskite to improve its moisture stability and a bridge between the perovskite and HTL for effective charge transport. In addition, they show an effective doping effect in the HTL to improve its carrier mobility. With the help of the combined effects of these groups in DFPDA, the PSCs with DFPDA additive achieve a champion efficiency of 22.21% and a substantially improved stability against moisture, heat, and light.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Multifunctional Enhancement for Highly Stable and Efficient Perovskite Solar Cells

Cai

Cui

Chen

et al. 2020

Adv Funct Materials

Self Cite

322

273

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“…The blueshift of the emissions further confirms that the passivation by D–π–A porphyrins is beneficial to decrease the mid‐gap states. [ 35 ] Notably, the intensity of ss‐PL of the films is greatly enhanced from 5.47 × 10 5 for the control film to 9.77 × 10 5 , 1.77 × 10 6 , and 8.24 × 10 5 (a.u.) after treatment with CS0 , CS1 , and CS2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Donor–π–Acceptor Type Porphyrin Derivatives Assisted Defect Passivation for Efficient Hybrid Perovskite Solar Cells

Mai

Zhou

Xiong

et al. 2020

Adv Funct Materials

122

106

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In recent years, hybrid perovskite solar cells (PSCs) have attracted much attention owing to their low cost, easy fabrication, and high photoelectric conversion efficiency. Nevertheless, solution‐processed perovskite films usually show substantial structural disorders, resulting in ion defects on the surface of lattice and grain boundaries. Herein, a series of D–π–A porphyrins coded as CS0, CS1, and CS2 that can effectively passivate the perovskite surface, increase VOC and FF, reduce the hysteresis effect, enhance power conversion efficiency to be higher than 22%, and improve the device stability is developed. The results in this study demonstrated that the donor–π–acceptor type porphyrin derivatives are promising passivators that can improve the cell performance of PSCs.

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“…[ 14–16 ] Second, organic small molecule (SM) additives also have a positive effect on both efficiency and stability of perovskite by suppressing perovskite defects. [ 17,18 ] Third, polymers have also been employed and improved thermal stability of perovskite film. [ 19,20 ] However, volatile cations are likely to be removed in the additional annealing process required for forming a 2D perovskite capping layer, which could adversely affect the stability of perovskite crystals.…”

Section: Introductionmentioning

confidence: 99%

A Facile Surface Passivation Enables Thermally Stable and Efficient Planar Perovskite Solar Cells Using a Novel IDTT‐Based Small Molecule Additive

Choi

Liu

Kim

et al. 2021

Advanced Energy Materials

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Although perovskite solar cells (PSCs) have attracted enormous attention owing to their fascinating optoelectronic properties and solution processability, defects in PSCs, which adversely affect efficiency and stability, are still not completely resolved. Herein, a novel indacenodithieno[3,2‐b]thiophene‐based small molecule (SM) additive (IDTT‐ThCz), capable of interacting with perovskite layers, is developed. In particular, the IDTT‐ThCz, which can perform a surface passivation, is introduced into the perovskite layer to significantly suppress perovskite defects via antisolvent treatment. Furthermore, this facile surface passivation not only significantly improves the charge extraction capability, but also prevents perovskite degradation. The IDTT‐ThCz‐treated PSCs exhibits a power conversion efficiency (PCE) of 22.5% and retains 95% of its initial PCE after 500 h storage under thermal condition (85 °C), representing the most remarkable efficiency as well as stability among the SM additives reported to date.

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Thermally stable perovskite solar cells with efficiency over 21% via a bifunctional additive

Abstract: Biuret was introduced to regulate the crystallization process and passivate the defects of perovskite films, leading to MAPbI3 solar cells with efficiency over 21% and enhanced thermal stability.

Cited by 54 publications

References 35 publications

Multifunctional Enhancement for Highly Stable and Efficient Perovskite Solar Cells

Multifunctional Enhancement for Highly Stable and Efficient Perovskite Solar Cells

Donor–π–Acceptor Type Porphyrin Derivatives Assisted Defect Passivation for Efficient Hybrid Perovskite Solar Cells

A Facile Surface Passivation Enables Thermally Stable and Efficient Planar Perovskite Solar Cells Using a Novel IDTT‐Based Small Molecule Additive

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