Incorporation of γ-aminobutyric acid and cesium cations to formamidinium lead halide perovskites for highly efficient solar cells

Hu, Yanqiang; Shan, Yansu; Yu, Zhaolei; Sui, Haojie; Qiu, Ting; Zhang, Shufang; Ruan, Wei; Xu, Qinfeng; Jiao, Mengmeng; Wang, Dehua; Wu, Yunyi; Yang, Chuan‐Lu; Xu, Feng

doi:10.1016/j.jechem.2021.05.025

Cited by 20 publications

(14 citation statements)

References 28 publications

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“…To prove the superiority of this work in the preparation of large-scale solar modules, we prepared large-scale device modules on 5 cm Â 5 cm ITO substrate with an aperture area of 22.56 cm 2 for the first time (Figure 5a and S12, Supporting Information). [30,46] Figure 5b shows the best J-V curve and corresponding photovoltaic parameters of the module base on the DPO-modified SnO 2 substrate. A champion efficiency of 15.69% was achieved with a V oc of 7.51 V, a J sc of 3.02, and an FF of 69.18%.…”

Section: Resultsmentioning

confidence: 99%

Modification of SnO₂ with Phosphorus‐Containing Lewis Acid for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis

Jia

et al. 2021

Solar RRL

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Expeditious charge transfer at the interfaces between photoactive and charge transport layers is critical in perovskite solar cells (PSCs). Defects on the surface of charge transport layers usually lead to the degradation of carrier mobility, resulting in low power conversion efficiency (PCE) and serious hysteresis. Herein, phosphorus‐containing Lewis acids are applied to modify the SnO2/perovskite interface and neutralize redundant OH− on the SnO2 surface. The interaction between the Lewis acids and SnO2 significantly accelerate the electron transfer and greatly reduce the energy barrier at the SnO2/perovskite interface, boosting the PCE of the PSCs. By modifying the SnO2/pervoskite interface with diphenylphosphine oxide, the PCE of a small area device was increased from 18.94% to 22.14%, along with negligible hysteresis and improved stability. Moreover, the 5 × 5 cm2 solar modules with an aperture area of 22.56 cm2 achieved a best efficiency of 15.69%.

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Section: Resultsmentioning

confidence: 99%

Modification of SnO₂ with Phosphorus‐Containing Lewis Acid for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis

Jia

et al. 2021

Solar RRL

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“…[4,5] Composition engineering is the most used to fabricate α-FAPbI 3 perovskite. By partially replacing formamidinium (FA)/Iodine (I) with ions, such as methylammonium (MA), [6] cesium (Cs), [7] rubidium (Rb), [8] or/and bromine (Br), [9] a stable mixed-cations or mixed-halides FA-based perovskite film can be obtained. Numerous studies have shown that the Br element plays an important role in suppressing δ-FAPbI 3 , but at the cost of a large blue shift of the absorption edge.…”

Section: Doi: 101002/smtd202200933mentioning

confidence: 99%

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI₃ Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

et al. 2022

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Transition of δ‐phase formamidinium lead triiodide (δ‐FAPbI3) to pure α‐phase FAPbI3 (α‐FAPbI3) typically requires high processing temperature (150 °C), which often results in unavoidable residual stress. Besides, using methylammonium chloride (MACl) as additive in fabrication will cause MA residue in the film, compromising the compositional purity. Here, a stress‐released and compositional‐pure α‐FAPbI3 thin‐film is fabricated using 3‐chloropropylammonium chloride (Cl‐PACl) by two‐step annealing. The 2D template of n = 2 can preferentially form in perovskite with the introduction of Cl‐PACl at a temperature as low as 80 °C. Such a 2D template can guide the free components to form ordered α‐FAPbI3 and promote the transition of the formed δ‐FAPbI3 to α‐FAPbI3 by reducing the phase transition energy. As a result, the obtained perovskite films via low‐temperature phase‐transition have a high degree of crystal orientation and reduced residual stress. More importantly, most of the Cl‐PACl is volatilized during the subsequent high‐temperature annealing process accompanied by the disintegration of the 2D templates. The residual trace of Cl‐PA+ is mainly concentrated at the grain boundary near the perovskite surface layer, stabilizing α‐FAPbI3 and passivating defects. Perovskite solar cell based on pure α‐FAPbI3 achieves a power conversion efficiency of 23.03% with excellent phase stability and photo‐stability.

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“…The crystallinity of α-FAPbI 3 was enhanced, while the phase transition temperature was significantly dropped, resulting in a high PCE of 23.71%. [30] This work introduced a natural amino acid, that is, phenylalanine (shorted as Phe), into the scalable-coated FA-based perovskite films for fabricating large-scale F-PSCs and modules with areas over 300 cm 2 . We found that Phe could regulate the nucleation and crystal growth of large-area perovskite films during the scalable fabrication process.…”

Section: Introductionmentioning

confidence: 99%

“…The crystallinity of α‐FAPbI 3 was enhanced, while the phase transition temperature was significantly dropped, resulting in a high PCE of 23.71%. [ 30 ]…”

Section: Introductionmentioning

confidence: 99%

Natural Amino Acid Enables Scalable Fabrication of High‐Performance Flexible Perovskite Solar Cells and Modules with Areas over 300 cm²

Liu

Zhong

et al. 2022

Small Methods

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Upscaling large‐area formamidinium (FA)‐based perovskite solar cells (PSCs) has been considered as one of the most promising routes for the commercial applications of this rising photovoltaics technology. Here, a natural amino acid, phenylalanine (Phe), is introduced to regulate the nucleation and crystal growth process of the large‐scale coating of FA‐based perovskite films. Better film coverage and larger grain sizes are observed after adding Phe. Moreover, it is found that Phe can effectively passivate defects within perovskite films and suppress the nonradiative recombination due to the strong interaction with under‐coordinated Pb2+ ions in the perovskite films. Rigid PSCs based on the blade‐coated perovskite films containing Phe obtain a champion efficiency of 21.95%. The corresponding unencapsulated devices also exhibit excellent ambient stability, retaining 95% of their initial efficiencies after storage in the glovebox at 20 °C for 1000 h. Further, the strategy is applied to fabricate flexible PSCs and modules on polyethylene terephthalate/indium doped tin oxide substrates via slot‐die coating. Phe modified flexible devices achieve outstanding efficiencies of 20.21%, 12.1%, and 11.2% with aperture areas of 0.10, 185, and 333 cm2, respectively. The strategy here has paved a promising way for the large‐scale production of flexible PSCs.

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Incorporation of γ-aminobutyric acid and cesium cations to formamidinium lead halide perovskites for highly efficient solar cells

Cited by 20 publications

References 28 publications

Modification of SnO₂ with Phosphorus‐Containing Lewis Acid for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis

Modification of SnO₂ with Phosphorus‐Containing Lewis Acid for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI₃ Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

Natural Amino Acid Enables Scalable Fabrication of High‐Performance Flexible Perovskite Solar Cells and Modules with Areas over 300 cm²

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Incorporation of γ-aminobutyric acid and cesium cations to formamidinium lead halide perovskites for highly efficient solar cells

Cited by 20 publications

References 28 publications

Modification of SnO2 with Phosphorus‐Containing Lewis Acid for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis

Modification of SnO2 with Phosphorus‐Containing Lewis Acid for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI3 Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

Natural Amino Acid Enables Scalable Fabrication of High‐Performance Flexible Perovskite Solar Cells and Modules with Areas over 300 cm2

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Product

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Modification of SnO₂ with Phosphorus‐Containing Lewis Acid for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis

Modification of SnO₂ with Phosphorus‐Containing Lewis Acid for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI₃ Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

Natural Amino Acid Enables Scalable Fabrication of High‐Performance Flexible Perovskite Solar Cells and Modules with Areas over 300 cm²