Modulating MAPbI3 perovskite solar cells by amide molecules: Crystallographic regulation and surface passivation

Xie, Jin; Zhou, Ziren; Qiao, Hongwei; Chen, Mengjiong; Wang, Lijie; Yang, Shuang; Hou, Yu; Yang, Hua Gui

doi:10.1016/j.jechem.2020.07.050

Cited by 32 publications

(24 citation statements)

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“…However, organic cations, such as methylammonium (MA + ) and formamidinium (FA + ), lead to poor stability of hybrid perovskite materials under heat and light exposure. [ 7,8 ] To overcome these issues, solar cells using all‐inorganic CsPb X 3 ( X = Cl, Br and I) have been developed, and their PCE can reach 20.37% in the case of CsPbI 3 films. [ 9 ] Unfortunately, CsPbI 3 suffers from serious phase instability and degrades easily from the black α‐phase to the nonperovskite δ‐phase at room temperature or under ambient atmospheric conditions.…”

Section: Introductionmentioning

confidence: 99%

“…However, organic cations, such as methylammonium (MA + ) and formamidinium (FA + ), lead to poor stability of hybrid perovskite materials under heat and light exposure. [7,8] passivated the perovskite surfaces in parallel, and reduced the nonradiative energy losses at the top interfaces. The modulated device delivered an open-circuit voltage (V OC ) of 1.37 V and a record PCE of 17.51%, compared to 1.21 V and 14.31%, respectively, of the pristine device.…”

Section: Introductionmentioning

confidence: 99%

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Stoichiometric Dissolution of Defective CsPbI₂Br Surfaces for Inorganic Solar Cells with 17.5% Efficiency

Liu

Lian

Zhou

et al. 2022

Advanced Energy Materials

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The existence of a defective area composed of nanocrystals and amorphous phases on a perovskite film inevitably causes nonradiative charge recombination and structural degradation in perovskite photovoltaics. In this study, a stoichiometric etching strategy for the top surface of a defective cesium lead halide perovskite is developed by using ionic liquids. The dissolution of the original defective area substantially exposes the underlying perovskite, which is a high‐quality surface with retained stoichiometry and lattice continuity. The ionic liquid molecules are adsorbed on the perovskite surface via Coulombic interactions and passivate the undercoordinated surface lead centers. Such a structural modulation considerably reduces the trap density of the perovskite devices and enables a record power conversion efficiency of 17.51% and an open‐circuit voltage of 1.37 V of the CsPbI2Br cell with a perovskite bandgap of 1.88 eV. This work provides a novel technical route to improve the efficiency and environmental resilience of perovskite‐based optoelectronic devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stoichiometric Dissolution of Defective CsPbI₂Br Surfaces for Inorganic Solar Cells with 17.5% Efficiency

Liu

Lian

Zhou

et al. 2022

Advanced Energy Materials

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“… 36 Recently, Yang et al showed that the grain size improved with homogeneous distribution at the grain boundaries using the acetamide molecule in the CH 3 NH 3 PbI 3 structure. 37 Han et al passivated the trap states at the mp-TiO 2 /perovskite interface and within the perovskite by adding amide derivatives such as formamide, acetamide, and urea to the CH 3 NH 3 PbI 3 structure. 38 To improve the photovoltaic conversion efficiency (PCE) of PSCs, it is necessary to optimize the crystallization processes of perovskite films.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Optimization of Charge Transport Properties in a Triple-Cation Perovskite Layer and Triple-Cation Perovskite/Spiro-OMeTAD Interface by Dual Passivation

et al. 2022

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Molecular engineering of additives is a highly effective method to increase the efficiency of perovskite solar cells by reducing trap states and charge carrier barriers in bulk and on the thin film surface. In particular, the elimination of undercoordinated lead species that act as the nonradiative charge recombination center or contain defects that may limit interfacial charge transfer is critical for producing a highly efficient triple-cation perovskite solar cell. Here, 2-iodoacetamide (2I-Ac), 2-bromoacetamide (2Br-Ac), and 2-chloroacetamide (2Cl-Ac) molecules, which can be coordinated with lead, have been used by adding them into a chlorobenzene antisolvent to eliminate the defects encountered in the triple-cation perovskite thin film. The passivation process has been carried out with the coordination between the oxygen anion (−) and the lead (+2) cation on the enolate molecule, which is in the resonance structure of the molecules. The Spiro-OMeTAD/triple-cation perovskite interface has been improved by surface passivation by releasing HX (X = I, Br) as a byproduct because of the separation of alpha hydrogen on the molecule. As a result, a solar cell with a negligible hysteresis operating at 19.5% efficiency has been produced by using the 2Br-Ac molecule, compared to the 17.6% efficiency of the reference cell.

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“…24 used cross‐linked grain encapsulation (CLGE) strategy to improve both device stability, defect passivation and obtain high PCE of 22.7%. Xie et al. 25 demonstrated a series of Lewis‐base amides, for morphological regulation of methylammonium lead triiodide (MAPbI3) thin films.…”

Section: Introductionmentioning

confidence: 99%

“…Wei 29 used finite difference and Gummel iteration techniques to solve PSCs model. But these methods are complicated, time‐consuming, and more expensive for such problems 19‐31 . Slami et al.…”

Section: Introductionmentioning

confidence: 99%

An accurate numerical approach for studying perovskite solar cells

et al. 2021

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Summary This work presents different numerical methods that are used for the first time in solving Perovskite solar cells (PSCs). Classical differential quadrature, sinc, and discrete singular convolution (Regularized Shannon and Delta Lagrange kernels) methods are employed for studying this problem. The governing equations are derived based on Poisson's and continuity equations. The different quadrature techniques are introduced to convert the system of nonlinear partial differential equations to nonlinear algebraic system. Then, an iterative method is used to solve this system. Convergence and efficiency of the obtained results with error ≤10−8 depend on various computational characteristics for each technique. The computed results match with previous experiment, exact, finite difference, SCAPS 1‐D simulation software, and finite element scheme. Then, the comprehensive parametric study is explored to show the effects of density states, gap energy, thickness, temperatures, lifetimes, wavelength, absorption coefficient, recombination prefactor, and recombination mechanisms whether direct or indirect on power conversion efficiency (PCE) and charge transport of solar cells with and without interface material. After all that have been studied on PSCs, it was found that the best value of PCEs was 32%. Thus, the computed results of the present schemes may be useful for improving the performance level of PSCs.

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Modulating MAPbI3 perovskite solar cells by amide molecules: Crystallographic regulation and surface passivation

Cited by 32 publications

References 50 publications

Stoichiometric Dissolution of Defective CsPbI₂Br Surfaces for Inorganic Solar Cells with 17.5% Efficiency

Stoichiometric Dissolution of Defective CsPbI₂Br Surfaces for Inorganic Solar Cells with 17.5% Efficiency

Simultaneous Optimization of Charge Transport Properties in a Triple-Cation Perovskite Layer and Triple-Cation Perovskite/Spiro-OMeTAD Interface by Dual Passivation

An accurate numerical approach for studying perovskite solar cells

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Modulating MAPbI3 perovskite solar cells by amide molecules: Crystallographic regulation and surface passivation

Cited by 32 publications

References 50 publications

Stoichiometric Dissolution of Defective CsPbI2Br Surfaces for Inorganic Solar Cells with 17.5% Efficiency

Stoichiometric Dissolution of Defective CsPbI2Br Surfaces for Inorganic Solar Cells with 17.5% Efficiency

Simultaneous Optimization of Charge Transport Properties in a Triple-Cation Perovskite Layer and Triple-Cation Perovskite/Spiro-OMeTAD Interface by Dual Passivation

An accurate numerical approach for studying perovskite solar cells

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Product

Resources

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Stoichiometric Dissolution of Defective CsPbI₂Br Surfaces for Inorganic Solar Cells with 17.5% Efficiency

Stoichiometric Dissolution of Defective CsPbI₂Br Surfaces for Inorganic Solar Cells with 17.5% Efficiency