2022
DOI: 10.1002/adfm.202205289
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Regulation of Quantum Wells Width Distribution in 2D Perovskite Films for Photovoltaic Application

Abstract: Solution-processed 2D perovskite films generally contain mixed quantum wells (QWs) with multiple well width distribution, which seriously weakens the charge transfer. To achieve regulation of the QW width, strategies to optimize the crystallization dynamics of 2D perovskite films are urgently needed. In this review, systematic summary on QW distribution and guidelines for 2D perovskite phase regulation is provided, aiming to establish a general manual for preparing efficient 2D perovskite solar cells (PSCs). T… Show more

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Cited by 48 publications
(51 citation statements)
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“…Recently, 2D perovskites have attracted numerous research attention due to their superior stability compared to their 3D counterparts. The incorporation of 2D perovskites into a 3D perovskite to form a 2D/3D heterojunction has been demonstrated to be an effective strategy in passivating defect states and improving device stability. Typically, the 2D/3D heterojunction perovskites can be divided into the 2D/3D bilayer structure and the 2D/3D bulk heterojunction (BHJ). Unfortunately, constructing 2D/3D bilayer structures in all-inorganic perovskites is extremely difficult due to the strong interaction of Cs + ions with both Pb and halide ions, rendering it difficult to be replaced by the commonly used ammonium cations. In contrast, a 2D/3D BHJ is a suitable choice, since it does not need surface modification by the electrically insulating organic group, which will deteriorate efficient carrier transfer . Besides, the 2D perovskites in the 2D/3D BHJ can passivate the defects of 3D perovskites at both the interface and bulk .…”
mentioning
confidence: 99%
“…Recently, 2D perovskites have attracted numerous research attention due to their superior stability compared to their 3D counterparts. The incorporation of 2D perovskites into a 3D perovskite to form a 2D/3D heterojunction has been demonstrated to be an effective strategy in passivating defect states and improving device stability. Typically, the 2D/3D heterojunction perovskites can be divided into the 2D/3D bilayer structure and the 2D/3D bulk heterojunction (BHJ). Unfortunately, constructing 2D/3D bilayer structures in all-inorganic perovskites is extremely difficult due to the strong interaction of Cs + ions with both Pb and halide ions, rendering it difficult to be replaced by the commonly used ammonium cations. In contrast, a 2D/3D BHJ is a suitable choice, since it does not need surface modification by the electrically insulating organic group, which will deteriorate efficient carrier transfer . Besides, the 2D perovskites in the 2D/3D BHJ can passivate the defects of 3D perovskites at both the interface and bulk .…”
mentioning
confidence: 99%
“…Quasi-two-dimensional (quasi-2D) perovskites have been extensively studied for high-performance solar cells and light-emitting diodes, due to the easily modulated film properties such as the hydrophobicity, energy band gap, energy and charge transfer, and nonradiative recombination. Especially for perovskite light-emitting diodes (PeLEDs), the external quantum efficiencies (EQEs) of the red and green quasi-2D PeLEDs are already higher than those of three-dimensional PeLEDs, exceeding 25% and 28%, respectively. However, for lighting and display applications, the efficiencies of blue PeLEDs (including deep blue, blue, and sky blue) need to be further elevated. , Generally, the inefficient blue light emission is mainly related to strong nonradiative recombination, inefficient energy transfer, and unbalanced charge transport. , Compared to the perovskites with mixed halides of bromide and chloride, which are prone to form defects due to halide segregation, pure bromide quasi-2D perovskites show a greater potential for high-efficiency blue PeLEDs. , Notably, the phase distribution of quasi-2D perovskite films can be effectively modulated to significantly improve the energy transfer and in turn suppress the energy losses of the related nonradiative recombination. , …”
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confidence: 99%
“…There are various ways of realizing QWs: etching, nanopatterning and lithography [3], atomic layer deposition [4], chemical vapour deposition [5,6], molecular beam epitaxy [7], to cite a few. QWs are very attractive because of the associated reduced dimensionality which gives rise to quantum effects that can be exploited, for example in photovoltaics [8], optoelectronics [9,10], photodiodes [11] and laser technology [5,12].…”
Section: Introductionmentioning
confidence: 99%