Bilayer 2D-3D Perovskite Heterostructures for Efficient and Stable Solar Cells

Chen, Peng; He, Dongxu; Huang, Xia; Zhang, Chengxi; Wang, Lianzhou

doi:10.1021/acsnano.3c09176

Cited by 11 publications

(1 citation statement)

References 82 publications

(230 reference statements)

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“…Despite these attractive features, 2D/3D heterojunctions often involve a trade-off between efficiency and stability due to the nonnegligible intrinsic quantum well confinement effect of 2D perovskite. , Generally, the formula of 2D perovskite structures is R 2 A n– 1 B n X 3 n +1 ( n ≥ 1), where R represents large organic ammonium cations and n refers to the dimensionality of the 2D perovskite . In recent advancements, various organic ligands have been used to form 2D/3D perovskite.…”

Section: Introductionmentioning

confidence: 99%

Modulating Dimensionality of 2D Perovskite Layers for Efficient and Stable 2D/3D Perovskite Photodetectors

Lai,

Liu,

Zhou

et al. 2024

ACS Appl. Mater. Interfaces

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perovskites have been widely adopted for improving the performance and stability of three-dimensional (3D) metal halide perovskite devices. However, rational manipulation of the phase composition of 2D perovskites for suitable energy level alignment in 2D/3D perovskite photodetectors (PDs) has been rarely explored. Herein, we precisely controlled the dimensionality of the 2D perovskite on CsPbI 2 Br films by tuning the polarity of the n-butylammonium iodide (BAI)-based solvents. In comparison to the pure n = 1 2D perovskite (ACN-BAI) formed by acetonitrile treatment, a mixture of n = 1 and n = 2 phases (IPA-BAI) generated by isopropanol (IPA) treatment guaranteed more robust defect passivation and favorable energy level alignment at the perovskite/hole transport layer interface. Consequently, the IPA-BAI PD exhibited a responsivity of 0.41 A W −1 , a detectivity of 1.01 × 10 13 Jones, and a linear dynamic range of 120 dB. Furthermore, the mixedphase 2D layer effectively shielded the 3D perovskite from moisture. The IPA-BAI device retained 76% of its initial responsivity after 500 h of nonencapsulated storage at 10% relative humidity. This research provides valuable insights into the dimensional modulation of 2D perovskites for further enhancing the performance of 2D/3D perovskite PDs.

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Section: Introductionmentioning

confidence: 99%

Modulating Dimensionality of 2D Perovskite Layers for Efficient and Stable 2D/3D Perovskite Photodetectors

Lai,

Liu,

Zhou

et al. 2024

ACS Appl. Mater. Interfaces

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In Situ Exploration of Dipole Field Effects on Weak Hysteresis in 3D/2D Perovskites

Chen,

Wu,

Pathak

et al. 2024

Adv Elect Materials

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This research delves into the effects of 2D layers on the functionality of 3D perovskite using lock‐in amplifier‐based in situ surface photovoltage (SPV) and its phase spectroscopy, with an emphasis on elucidating the connection between the tuning of dipole moments and the photocurrent hysteresis. Conventionally, the SPV of a perovskite/hole transport layer is observed to diminish as positive bias escalates. However, this trend is reversed in the case of 3D perovskite samples, where an augmentation in SPV is noted under positive bias. Notably, 3D/2D perovskite structures initially show a decrease, then an increase in SPV as bias intensifies, a phenomenon more pronounced with larger dipole moments in 2D. However, there is no linear relationship between the dipole moment and the hysteresis factor. Furthermore, using in situ light‐chopping‐frequency‐modulated SPV and Kelvin Probe Force Microscopy, it is revealed that the dipole fields of 2D layers can hinder ion migration. This leads to efficient hole transfer and minimal photocurrent hysteresis in 3D/2D perovskites, providing strong evidence for the underlying cause of hysteresis. Additionally, these findings suggest intricate interplays among the external electric field, interface dipole moments, and surface photovoltaics, offering significant insights into perovskite optoelectronics.

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20.1 % Certified Efficiency of Planar Hole Transport Layer‐Free Carbon‐Based Perovskite Solar Cells by Spacer Cation Chain Length Engineering of 2D Perovskites

Tang,

Lin,

Yan

et al. 2024

Angewandte Chemie

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The planar triple‐layer hole transport layer (HTL)‐free carbon‐based perovskite solar cells (C‐PSCs) have outstanding advantages of low cost and high stability, but are limited by low efficiency. The formation of a 3D/2D heterojunction has been widely proven to enhance device performance. However, the 2D perovskite possesses multiple critical properties associated with 3D perovskite, including defect passivation, energy level, and charge transport properties, all of which can impact device performance. It is challenging to find a powerful means to achieve comprehensive regulation and trade‐off of these key properties. Herein, we propose a chain‐length engineering of alkylammonium spacer cations to achieve this goal. The results show that the 2D perovskite formed by short‐chain alkylammonium cations primarily acts to passivate defects. With the increase in cation chain length, the 2D perovskite achieves a more matched energy level with 3D perovskite, enhancing the built‐in electric field and promoting charge separation. However, the further increase in chain length impedes the charge transport due to the insulativity of organic cations. Comprehensively, the 2D perovskite formed by tetradecylammonium cations achieves the optimal balance of defect passivation, interface charge separation, and charge transport. The planar HTL‐free C‐PSCs exhibit a new record efficiency of 20.40% (certified 20.1%).

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Bilayer 2D-3D Perovskite Heterostructures for Efficient and Stable Solar Cells

Cited by 11 publications

References 82 publications

Modulating Dimensionality of 2D Perovskite Layers for Efficient and Stable 2D/3D Perovskite Photodetectors

Modulating Dimensionality of 2D Perovskite Layers for Efficient and Stable 2D/3D Perovskite Photodetectors

In Situ Exploration of Dipole Field Effects on Weak Hysteresis in 3D/2D Perovskites

20.1 % Certified Efficiency of Planar Hole Transport Layer‐Free Carbon‐Based Perovskite Solar Cells by Spacer Cation Chain Length Engineering of 2D Perovskites

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