Molecular interactions and functionalities of an organic additive in a perovskite semiconducting device: a case study towards high performance solar cells

Gong, Hongkang; Song, Qi; Ji, Chao; Zhang, Huimin; Liang, Chunjun; Sun, Fulin; Zhang, Chenhui; Yang, Anqi; Li, Dan; Jing, Xiping; You, Fangtian; He, Zhengjie

doi:10.1039/d1ta08321j

Cited by 19 publications

(11 citation statements)

References 77 publications

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“…Additionally, the CO moieties of l -TrpBr form coordination bonds with the Pb 2+ cations (CO:Pb), which subsequently retard the crystallization of the quasi-2D perovskite. According to the previous report, the NH 3 + groups of l -TrpBr can also interact with the PbBr 2 cage to passivate the defects at grain boundaries. Thus, the uncoordinated sites at the grain surface and boundaries were passivated, and the film also became smoother and denser, which will be discussed later. , Besides the phase distribution, the film’s morphology and defect density should be considered.…”

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confidence: 91%

Rearranging the Phase Distribution of Quasi-2D Perovskite for Efficient and Narrow Emission Perovskite Light-Emitting Diodes

Yang

Zhang

et al. 2022

J. Phys. Chem. Lett.

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Quasi-2D perovskite light-emitting diodes (PeLEDs) have attracted significant attention for their promising light-emitting applications. However, quasi-2D perovskite films typically consist of a broad phase distribution and small grains with a large surface area to volume ratio, leading to inferior color purities and higher defect densities. Herein, a bifunctional additive ((l)-tryptophan bromide, l-TrpBr) was introduced into a quasi-2D perovskite film. The CO moiety of l-TprBr formed hydrogen bonds with S-MBA+, retarding the coordination between S-MBABr and [PbBr6]4– and suppressing the formation of small-n phases. The CO moiety also coordinated with unsaturated Pb2+ sites to passivate the defects. Finally, the PeLEDs with l-TrpBr exhibited a significantly improved EQE of 14.32% compared to the control devices (7.88%) and the narrowest fwhm (17 nm) for green quasi-2D PeLEDs reported to date. Our work provides a practical approach to controlling the phase distribution and passivating the defects in quasi-2D perovskite films, toward high-efficiency and color-pure quasi-2D PeLEDs.

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confidence: 91%

Rearranging the Phase Distribution of Quasi-2D Perovskite for Efficient and Narrow Emission Perovskite Light-Emitting Diodes

Yang

Zhang

et al. 2022

J. Phys. Chem. Lett.

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“…The peak intensity of (110) planes at 14.05° of the PDI 2 ‐treated perovskite film is 147% of that of the control sample, indicating that the dynamic growth of the perovskite crystals is facilitated by the PDI 2 ‐treated substrate, resulting in significantly improved crystallinity and larger crystal grains. [ 16 ] The full width at half maximum (FWHM) of the (110) orientation for different perovskite films is computed, as shown in Table S3, Supporting Information. The value of FWHM for the PDI 2 ‐treated film descends from 0.1581 to 0.1277, which is consistent with the increased diffraction intensity in the XRD patterns.…”

Section: Resultsmentioning

confidence: 99%

Bridging the Buried Interface with Piperazine Dihydriodide Layer for High Performance Inverted Solar Cells

Song

Gong

Sun

et al. 2023

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comparison to stability between both kinds of solar cells, we might soberly conceive that there is still an immense challenge for the operation lifetime of PSCs. [8][9][10][11] Up to this point, significant attempts have been made to increase the stability of PSCs using multiple-faceted tactics such as adjusting the components of perovskite precursor (methylammounium(MA)free, inorganic or low dimensional materials), [12][13][14] developing additive engineering or passivation agents, [15,16] exploring novel fabrication strategies (liquid medium annealing and mechanical or chemical polishing) and replacing the charge transport layer with robust materials. [17][18][19] These methods have shown significant improvement in curbing the defects located at the grain boundaries or surface and consolidating the structure of perovskite film. However, the stability of PSCs is not yet at the level needed to open the commercial door, therefore further exploration of alternative approaches is needed before perovskite solar cells may enter the mainstream. As for the solution deposition process of perovskite films, the perovskite-substrate interface intimately affects perovskite crystallization, interface defects, and residual strain, which play a key role in fabricating high-quality perovskite films as well. Additionally, it is known that the buildup of deep-level trap states causes undesired non-radiative losses to occur at the interfaces with bottom contact layers, resulting in reduced device power outputs. [20,21] However, compared with the indepth study on the top interface, exploring the degradation process of the buried side of perovskite film from the morphology and photo-electronics aspects is relatively complicated and scanty owing to non-exposed features. [22,23] Recent studies illustrate the formation of a large number of 3D voids at the imbedded interface of perovskites and hole transport layer in p-i-n-structured solar cells. [24,25] These unfavorable voids are attributed to the inadequate evaporation of the entrapped nonvolatile solvent additives, such as dimethyl sulfoxide (DMSO), resulting in defect densities ascending of roughly two orders of magnitude compared with the center of the perovskite film. [25,26] Under illumination testing, perovskite solar cells start to deteriorate at the interfacial regions between perovskites and charge transport layers. [23] Yang et al. established the microstructure-property relations for uncovering the basic Given that it is closely related to perovskite crystallization and interfacial trap densities, buried interfacial engineering is crucial for creating effective and stable perovskite solar cells. Compared with the in-depth studies on the defect at the top perovskite interface, exploring the defect of the buried side of perovskite film is relatively complicated and scanty owing to the non-exposed feature. Herein, the degradation process is probed from the buried side of perovskite films with continuous illumination and its effects on morphology and photoelectronic characteris...

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“… 42 In our case, it was possible to identify those shoulders only in the case of the pristine and FM-NH 2 -treated films at an energy equal to 137.8 and 142.6 eV ( Figure S18c ). 43 , 44 However, in the cause of neutral molecule, the area of the Pb 0 -related peaks decreased by 32% regarding the pristine film, suggesting a passivating effect conferred by FM-NH 2 due to both the lone pairs on the nitrogen atom and the electron cloud over the molecule. The main changes are seen upon salt treatment, in which the intensity of Pb 0 signals is highly suppressed, meaning that these molecules retard the formation of metallic lead.…”

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confidence: 99%

Improving the Stability and Efficiency of Perovskite Solar Cells by a Bidentate Anilinium Salt

Scalon

Szostak

Araújo

et al. 2022

JACS Au

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We report improvement in the perovskite solar cell efficiency and stability after passivation with an organic molecule decorated with two anilinium cations. We compare this salt with its neutral analog and found that the change in the electron density distribution upon protonation and the presence of the halide anion are key to explaining the better passivation ability of the salt. In addition, we show that the counteranion has a significant impact on the performance of the device.

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Molecular interactions and functionalities of an organic additive in a perovskite semiconducting device: a case study towards high performance solar cells

Abstract: A chiral aromatic amino acid, (S)-3-Amino-4-phenylbutyric acid hydrochloride (s-APACl), was employed as an additive to the active layer in a p-i-n organic-inorganic halide perovskite solar cell. This additive led to...

Cited by 19 publications

References 77 publications

Rearranging the Phase Distribution of Quasi-2D Perovskite for Efficient and Narrow Emission Perovskite Light-Emitting Diodes

Rearranging the Phase Distribution of Quasi-2D Perovskite for Efficient and Narrow Emission Perovskite Light-Emitting Diodes

Bridging the Buried Interface with Piperazine Dihydriodide Layer for High Performance Inverted Solar Cells

Improving the Stability and Efficiency of Perovskite Solar Cells by a Bidentate Anilinium Salt

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