Mixed 2D-Dion—Jacobson/3D Sn-Pb alloyed perovskites for efficient photovoltaic solar devices

Lu, Zhili; Li, Chaohui; Lai, Hongwei; Zhou, Xinming; Wang, Chunfeng; Liu, Xianhu; Guo, Fei; Pan, Caofeng

doi:10.1007/s12274-022-4894-1

Cited by 10 publications

(10 citation statements)

References 44 publications

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“…As shown in Figure E, an extra Bragg diffraction spot located at q r = 0.55 Å –1 is visible in the target sample rather than in the control sample, which corresponds to a real space distance of 11.42 Å. This value is consistent with the characteristics of the 2D perovskites based on BDADI as reported in literature, , suggesting that the deposited BDADI interlayer interacts with the perovskite precursor solution to form 2D structures. Furthermore, integrals at the (100) plane with an angular width of q r = 0.95–1.05 Å –1 are extracted from 2D GIWAXS data and displayed in Figure S3 (Supporting Information).…”

supporting

confidence: 88%

Stable Electron-Transport-Layer-Free Perovskite Solar Cells with over 22% Power Conversion Efficiency

et al. 2023

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Due to their low cost and simplified production process, electron-transportlayer-free (ETL-free) perovskite solar cells (PSCs) have attracted great attention recently. However, the performance of ETL-free PSCs is still at a disadvantage compared to cells with a conventional n-i-p structure due to the severe recombination of charge carriers at the perovskite/anode interface. Here, we report a strategy to fabricate stable ETL-free FAPbI 3 PSCs by in situ formation of a low dimensional perovskite layer between the FTO and the perovskite. This interlayer gives rise to the energy band bending and reduced defect density in the perovskite film and indirect contact and improved energy level alignment between the anode and perovskite, which facilitates charge carrier transport and collection and suppresses charge carrier recombination. As a result, ETL-free PSCs with a power conversion efficiency (PCE) exceeding 22% are achieved under ambient conditions.

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supporting

confidence: 88%

Stable Electron-Transport-Layer-Free Perovskite Solar Cells with over 22% Power Conversion Efficiency

et al. 2023

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“…Three regions representing ohmic current, trap-filling current (TFC), and space–charge-limited current (SCLC) are clearly distinguished. The inflection point ( V tr ) is extracted from the ohmic and TFC regions to obtain trap density ( N trap ) by the following formula N trap = 2 ε 0 ε normalr V tr q L 2 where ε 0 is the permittivity of vacuum, ε r is the relative dielectric constant (≈25), q is the elementary charge, and L is the thickness of the perovskite. The corresponding N trap was calculated to be 6.80 × 10 15 , 6.70 × 10 15 , 6.32 × 10 15 , and 6.39 × 10 15 cm –3 for (BDA)(MA) 4 Pb 5 I 16 PSCs without and with 0.01, 0.1, and 1.0 mg/mL PASP interlayers, respectively.…”

Section: Resultsmentioning

confidence: 99%

Defect Regulation of Efficient Dion–Jacobson Quasi-2D Perovskite Solar Cells via a Polyaspartic Acid Interlayer

Zhai,

Chen,

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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Interfacial modification is a promising strategy to fabricate highly efficient perovskite solar cells (PSCs). Nevertheless, research studies about optimization for the performance of Dion–Jacobson (DJ)-phase quasi-2D PSCs by underlying surface modification are rarely reported. The relevant influence of interfacial modification on defect regulation in the bulk and at the interface for PSCs is still unexplored. Herein, an interlayer of polyaspartic acid (PASP) was introduced at the interface of a hole transporting layer and a perovskite absorber to regulate both the film quality and interface property for BDA-based DJ quasi-2D PSCs (n = 5). The PASP interlayer suppressed the charge recombination, restricted the interfacial charge accumulation, and promoted the charge transport in devices and therefore improved the power conversion efficiency of PSCs from 15.03 to 17.34%. Moreover, through device simulation, it was concluded that the increase of open-circuit voltage (V oc) was mainly attributed to the suppression of interface defects, while the increase of short-circuit current (J sc) was ascribed to the restriction of interface defects and perovskite bulk defects. The improvement of both V oc and J sc originated from the passivation of shallow defect states. The present work provides a promising route for the fabrication of efficient quasi-2D PSCs and enriches the fundamental understanding of defect regulation on photovoltaic performance.

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“…In comparison, the control devices lost almost 75% of their initial PCE over the same time. [37] Apart from successful grain enlargement, the GBs are also treated with various small molecules, ranging from bulky porphyrin complexes to simple alkyl ammonium salts, to passivate the GB defects. For instance, porphyrin-based molecules with transition-metal centers (M: Co, Ni, Cu, or Zn) and ammonium functional groups have been successfully employed as an additive in MHPs with PCEs > 22% (Figure 2a).…”

Section: Bulk Passivationmentioning

confidence: 99%

Moisture‐Resilient Perovskite Solar Cells for Enhanced Stability

et al. 2023

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With the rapid rise in device performance of perovskite solar cells (PSCs), overcoming instabilities under outdoor operating conditions has become the most crucial obstacle towards their commercialization. Among stressors such as light, heat, voltage bias, and moisture, the latter is arguably the most critical, as it can decompose metal‐halide perovskite (MHP) photo‐active absorbers instantly through its hygroscopic components (organic cations and metal halides). In addition, most charge transport layers (CTLs) commonly employed in PSCs also degrade in the presence of water. Furthermore, photovoltaic module fabrication encompasses several steps, such as laser processing, sub‐cell interconnection, and encapsulation, during which the device layers are exposed to the ambient atmosphere. Therefore, as a first step towards long‐term stable perovskite photovoltaics, it is vital to engineer device materials towards maximizing moisture resilience, which can be accomplished by passivating the bulk of the MHP film, introducing passivation interlayers at the top contact, exploiting hydrophobic CTLs, and encapsulating finished devices with hydrophobic barrier layers, without jeopardizing device performance. In this article, we review existing strategies for enhancing the performance stability of PSCs and formulate pathways toward moisture‐resilient commercial perovskite devices.This article is protected by copyright. All rights reserved

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Mixed 2D-Dion—Jacobson/3D Sn-Pb alloyed perovskites for efficient photovoltaic solar devices

Cited by 10 publications

References 44 publications

Stable Electron-Transport-Layer-Free Perovskite Solar Cells with over 22% Power Conversion Efficiency

Stable Electron-Transport-Layer-Free Perovskite Solar Cells with over 22% Power Conversion Efficiency

Defect Regulation of Efficient Dion–Jacobson Quasi-2D Perovskite Solar Cells via a Polyaspartic Acid Interlayer

Moisture‐Resilient Perovskite Solar Cells for Enhanced Stability

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