Tetra-indole core as a dual agent: a hole selective layer that passivates defects in perovskite solar cells

Pegu, Meenakshi; Kazim, Samrana; Huang, Peng; Lezama, Luís; Ahmad, Shahzada

doi:10.1039/d1tc01258d

Cited by 8 publications

(8 citation statements)

References 59 publications

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“…Furthermore, the long‐term operational stability of the optimized concentration of 0.5 % NBS treated unencapsulated PSC was examined at the maximum power point voltage under continuous light illumination at nearly 1 sun for ∼50 h at ambient atmospheric conditions (25–27 °C, ∼60 % RH environment). Notably, the NBS treated PSCs maintained almost 70 % of their initial performance as compared to MAPbI 3 [20] based PSC in our previous report, which retained only 29 % of its initial device performance. (Figure 4d) [20,37] .…”

Section: Resultsmentioning

confidence: 52%

“…Notably, the NBS treated PSCs maintained almost 70 % of their initial performance as compared to MAPbI 3 [20] based PSC in our previous report, which retained only 29 % of its initial device performance. (Figure 4d) [20,37] . The statistics of PV performance ( V oc and PCE; J sc and FF) are also presented (Figure 4e–f and S8).…”

Section: Resultsmentioning

confidence: 52%

“…(Figure 4d). [20,37] The statistics of PV performance (V oc and PCE; J sc and FF) are also presented (Figure 4e-f and S8).…”

Section: Chempluschemmentioning

confidence: 99%

“…Surface passivation is another effective protocol to reduce defects present at the surface of perovskites and suppress undesirable ion movement [17–19] . The defects present on the perovskite surface accelerate the decomposition pathways and promote nonradiative recombination that limits performance and reliability [20] . Surface defects can be interstitial, created through vacancy, or stem from grain boundaries, and impacts carrier concentration, transport, and its recombination [21] …”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19] The defects present on the perovskite surface accelerate the decomposition pathways and promote nonradiative recombination that limits performance and reliability. [20] Surface defects can be interstitial, created through vacancy, or stem from grain boundaries, and impacts carrier concentration, transport, and its recombination. [21] Several pre-treatment of the perovskite solution with halide precursors is being discussed in the literature for the successful solution-phase halide exchange reaction using additives or acids.…”

Section: Introductionmentioning

confidence: 99%

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Reducing the Trap Density in MAPbI₃ Based Perovskite Solar Cells via Bromide Substitution

et al. 2022

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The past decade has witnessed tremendous advancement in the field of halide perovskite (PSK) as a choice of material for high-performing solar cells fabrication. Here, we investigate the impact of the halide exchange through N-bromosuccinimide (NBS) treatment in MAPbI 3 based solar cells. We observed the partial halide exchange (I À to Br À ) or the filling of halide (X À ) vacancy upon treatment of different NBS concentrations experimentally by spectroscopic and diffractogram studies. We noted that halide exchange impacts the crystallization and is beneficial in improving the photovoltaic performance. The optimized 0.5 % NBS treated PSC exhibited a power conversion efficiency of 17.87 % due to an increment in open-circuit voltage (V oc ) and short circuit current (J sc ). We noted improved perovskite crystal growth upon Br À substitution; eventually, it helps to lower the trap density, reducing non-radiative recombination and renders the enhancement of long-term stability of PSC.

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 52%

“…(Figure 4d). [20,37] The statistics of PV performance (V oc and PCE; J sc and FF) are also presented (Figure 4e-f and S8).…”

Section: Chempluschemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reducing the Trap Density in MAPbI₃ Based Perovskite Solar Cells via Bromide Substitution

et al. 2022

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Directed C–H Functionalization of C3-Aldehyde, Ketone, and Acid/Ester-Substituted Free (NH) Indoles with Iodoarenes via a Palladium Catalyst System

et al. 2022

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Pd(II)-catalyzed C−H arylations of free (NH) indoles including different carbonyl directing groups on C3-position with aryl iodides are demonstrated. Importantly, the reactions are carried out using the same catalyst system without any additional transient directing group (TDG). In this study, the formyl group as a directing group gave the C4-arylated indoles versus C2-arylation. Using this catalyst system, C−H functionalization of 3-acetylindoles provided domino C4-arylation/3,2-carbonyl migration products. This transformation involves the unusual migration of the acetyl group to the C2-position following C4-arylation in one pot. Meanwhile, migration of the acetyl group could be simply controlled and N-protected 3-acetylindoles afforded C4-arylation products without migration of the acetyl group. Functionalization of indole-3carboxylic acid (or methyl ester) with aryl iodides using the present Pd(II)-catalyst system resulted in decarboxylation followed by the formation of C2-arylated indoles. Based on the control experiments and the literature, plausible mechanisms are proposed. The synthetic utilities of these acetylindole derivatives have also been demonstrated. Remarkably, C4-arylated acetylindoles have allowed the construction of functionalized pityiacitrin (a natural product).

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π-Extended Octupolar Cyclized Indole Tetramer and Trimer Derivatives with Second- and Third-Order Nonlinear Optical Properties

Wang

Fang

2023

J. Org. Chem.

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Several aromatic-fused octupolar tetraindole (TTI) and triindole (TI) derivatives have been synthesized via POCl3-promoted cyclopolymerization of the aromatic-fused oxindoles. As a result, the terminal phenyls of TTI and TI are fused with the phenyl group, indenyl group, and benzothienyl group separately in the π-extended target compounds TTIp and TIp, TTIid and TIid, and TTIbt and TIbt (including pairs of syn- and anti-isomers). Single-crystal X-ray diffraction disclosed that the tetramer syn-TTIbt keeps an S 4-symmetric architecture and crystallizes in the P42/n space group. With the extension of the π-conjugation, the absorption and emission bands of the above tetramers and trimers are remarkably red-shifted. The second-order nonlinear optical (NLO) coefficients (β value) of syn-TTIbt and anti-TTIbt have been calculated to be 1.5 and 2.1 times that of their parent compound TTI, respectively. In the domain of the third-order NLO, the two-photon absorption sections (δ value) of syn-TIbt and anti-TIbt have been measured to be 37 and 102 times that of TI, respectively. These results indicate that the π-extension strategy here is successful, and the anti-isomers have better NLO properties and better π-conjugation than their corresponding syn-isomers.

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Tetra-indole core as a dual agent: a hole selective layer that passivates defects in perovskite solar cells

Cited by 8 publications

References 59 publications

Reducing the Trap Density in MAPbI₃ Based Perovskite Solar Cells via Bromide Substitution

Reducing the Trap Density in MAPbI₃ Based Perovskite Solar Cells via Bromide Substitution

Directed C–H Functionalization of C3-Aldehyde, Ketone, and Acid/Ester-Substituted Free (NH) Indoles with Iodoarenes via a Palladium Catalyst System

π-Extended Octupolar Cyclized Indole Tetramer and Trimer Derivatives with Second- and Third-Order Nonlinear Optical Properties

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Tetra-indole core as a dual agent: a hole selective layer that passivates defects in perovskite solar cells

Cited by 8 publications

References 59 publications

Reducing the Trap Density in MAPbI3 Based Perovskite Solar Cells via Bromide Substitution

Reducing the Trap Density in MAPbI3 Based Perovskite Solar Cells via Bromide Substitution

Directed C–H Functionalization of C3-Aldehyde, Ketone, and Acid/Ester-Substituted Free (NH) Indoles with Iodoarenes via a Palladium Catalyst System

π-Extended Octupolar Cyclized Indole Tetramer and Trimer Derivatives with Second- and Third-Order Nonlinear Optical Properties

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Reducing the Trap Density in MAPbI₃ Based Perovskite Solar Cells via Bromide Substitution

Reducing the Trap Density in MAPbI₃ Based Perovskite Solar Cells via Bromide Substitution