Crystal growth, defect passivation and strain release via In-situ Self-polymerization strategy enables efficient and stable perovskite solar cells

Qiu, Fazheng; Sun, Jiayi; Qi, Junjie

doi:10.1016/j.cej.2021.132869

Cited by 35 publications

(30 citation statements)

References 59 publications

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“…[22][23][24][25] The additive molecules containing CO have been widely demonstrated to control perovskite crystal growth and passivate film defects through the coordination interaction between the electron donor atom and undercoordinated Pb 2+ . [26][27][28] Notably, the strong coordination between additive molecules and uncoordinated Pb 2+ not only passivates defects, but also serves as anchor to strengthen the bonding force between grains, thereby further improving the stability of films. [19,29] Therefore, if multi-active-site ligand molecules could coordinate with different grains, it would exhibit a greater defect passivation potential.…”

Section: Introductionmentioning

confidence: 99%

Grain Boundary Chemical Anchoring via Bidirectional Active Site Additive Enables Efficient and Stable Perovskite Solar Cells

Wang

Bai

et al. 2022

Adv Materials Inter

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Since the first demonstration on all-solidstate perovskite solar cells (PSCs) with a power conversion efficiency (PCE) of 9.7%, [3] the PCE of the organometal halidebased PSCs has skyrocketed from initial 3.8% [4] to presently certified 25.7%, [5] which makes the PSCs a promising candidate for the next-generation solar cells. It is well known that efficient and stable PSCs require high quality perovskite films. However, a large number of defects exist on the surface and grain boundaries (GBs) of perovskite films prepared by solution method, which acting as nonradiative recombination sites, causing a significant reduction in photogenerated carrier lifetimes and concomitant drop of open-circuit voltage (V OC ). [6][7][8] In addition, the defects at GBs would make the penetration of water and oxygen easier, which facilitates the degradation of perovskites films. [9,10] To further enhance the device performance, it is highly expected to minimize the trap-assisted nonradiative recombination via reducing defects in perovskite films. [11] Currently, additive engineering is one of the effective methods commonly used for defect passivation in perovskite films. [12][13][14] Lewis acid molecules, [15,16] Lewis base molecules, [17][18][19] and organic/inorganic salts [20,21] have been introduced as additive toThe nonradiative recombination induced by trap states at the surface and grain boundaries impedes the further increase of power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). Consequently, it is highly desirable to minimize the trap-assisted nonradiative recombination in perovskite films. Here, an effective additive engineering strategy is reported where N-succinimidyl 6-maleimidohexanoate (denoted as NSMH) with multiple active sites and hydrophobic alkyl chains were incorporated for fully eliminating undercoordinated Pb 2+ traps in perovskite films. It is revealed that improved crystallinity and reduced defect density are achieved, which is ascribed to the strong coordination interaction between the carbonyl groups at both sides of NSMH molecules and Pb 2+ . As a result, the NSMH-modified device exhibits a champion PCE of 22.40% with negligible hysteresis, which is significantly higher than 20.67% of the control device. The unencapsulated modified device exhibits no degradation while the control device degrades to 82% of its initial PCE after storing for 1536 h in a relative humidity of 10-20% at room temperature in the dark.

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Section: Introductionmentioning

confidence: 99%

Grain Boundary Chemical Anchoring via Bidirectional Active Site Additive Enables Efficient and Stable Perovskite Solar Cells

Wang

Bai

et al. 2022

Adv Materials Inter

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“…[4] Due to its simple and low-energy construction technique, material cost-effectiveness, and low hysteresis properties, the inverted structure of PSC has become increasingly appealing. [5] The improvement in performance for both PSC structures is due to many studies focusing on compositional and stoichiometric, [6] crystallization process optimizations, [7] selective charge transport layer development, [8] and mainly due to bulk and interface passivation engineering of the perovskite films. [9] The fundamental hurdle impeding the commercialization of PSCs is the instability problem, which is exacerbated by the existence of traps, defects, and tiny crystal grains, primarily near the grain boundaries of the active layer.…”

Section: Introductionmentioning

confidence: 99%

Single‐step post‐production treatment of lead acetate precursor‐based perovskite using alkylamine salts for reduced grain‐boundary related film defects

et al. 2022

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Powered by the worldwide efforts of research groups experienced in dyesensitized, and thin-film solar cells, perovskite solar cells (PSCs) reached a power conversion efficiency of 25.7% within 10 years. However, the presence of defects and trap density within the active layer's grain boundaries commonly operates as non-radiative recombination centers. Hence, intensive efforts have been reported to passivate the inevitable bulk and interface defects of the active layer using additives or post-treatment processing to enhance the efficiency and stability of PSCs. Herein, a facile post-treatment strategy based on wet processing methylammonium lead triiodide, MAPbI 3 (prepared from lead acetate and methylammonium iodide precursors) films with organic amine salts (FABr and FAI) is demonstrated. As a result, high-quality films of mixed perovskites (FA x MA 1-x PbI 3-x Br x and FA x MA 1-x PbI 3 ) were obtained. The surface treatment has efficiently passivate the defects in the host film, suppressing the non-radiative carrier recombination. Compared to the control device, the increased open-circuit voltage (from 0.5 V to 1 V) and fill factor (FF) values of the optimized device based on FA x MA 1-x PbI 3 showed a PCE of 16.13%. And our findings revealed that post-treatment is possible on wet perovskite film aged for a few minutes prior to its post-treatment, which saved the energy used for pre-annealing. K E Y W O R D Salkyl amine salts, inverted perovskite solar cells, perovskite film crystallinity, post-treatment passivation, power conversion efficiency, Wet MAPbI 3 filmThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The stretching vibrations of the CO bonds of l -TrpBr also shift from 1729 to 1740 cm –1 because the interaction between the lone-pair electron of CO groups and Pb 2+ ions weakened the hydrogen bonding of the CO groups . The shifts of the stretching vibration of PbBr 2 and CO bonds indicate the interaction between the CO groups and uncoordinated Pb 2+ ions in the film. − In Figure g, we show a schematic diagram of the rearrangement of the phase distribution and the passivation of the defects in a quasi-2D perovskite film with the addition of l -TrpBr. For the precursor without l -TrpBr, S-MBA + will aggregate and preferentially coordinate with [PbBr 6 ] 4– during film formation .…”

mentioning

confidence: 97%

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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Crystal growth, defect passivation and strain release via In-situ Self-polymerization strategy enables efficient and stable perovskite solar cells

Cited by 35 publications

References 59 publications

Grain Boundary Chemical Anchoring via Bidirectional Active Site Additive Enables Efficient and Stable Perovskite Solar Cells

Grain Boundary Chemical Anchoring via Bidirectional Active Site Additive Enables Efficient and Stable Perovskite Solar Cells

Single‐step post‐production treatment of lead acetate precursor‐based perovskite using alkylamine salts for reduced grain‐boundary related film defects

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

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