Elimination of charge accumulation by a self-assembled cocrystal interlayer for efficient and stable perovskite solar cells

Wang, Xueying; Zhong, Yang; Luo, Xiao; Sheng, Wangping; Yang, Jia; Tan, Licheng; Chen, Yiwang

doi:10.1039/d3ee03550f

Cited by 10 publications

(3 citation statements)

References 61 publications

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“…Moreover, we observed a higher carrier mobility and lower trap-filled limited voltage when the FcP 2 molecule was introduced into the Spiro-OMeTAD (Figure S12). The improved interfacial carrier extraction would slow down the charge accumulation at the electron transport layer, which is beneficial for more balanced carrier transport in the device . To confirm this hypothesis, an electron-only device was fabricated and exhibited a similar trend, where the V TFL values of the FcP 2 -treated and control devices were 0.164 and 0.307 V, respectively.…”

Section: Resultsmentioning

confidence: 87%

“…The improved interfacial carrier extraction would slow down the charge accumulation at the electron transport layer, which is beneficial for more balanced carrier transport in the device. 23 To confirm this hypothesis, an electron-only device was fabricated and exhibited a similar trend, where the V TFL values of the FcP 2 -treated and control devices were 0.164 and 0.307 V, respectively. Correspondingly, the FcP 2 -treated device displays a lower defect density (3.41 × 10 17 cm −3 ) and slightly greater carrier mobility (9.64 × 10 −3 cm 2 V −1 s −1 ) than the control device (6.37 × 10 17 cm −3 and 8.30 × 10 −3 cm 2 V −1 s −1 ) (Figure 5a).…”

Section: Resultsmentioning

confidence: 88%

“…Polycrystalline lead halide perovskite thin films prepared through solution processing, due to their low formation energy and disordered crystallinity, easily form a plethora of defects at their bulk, grain boundaries, and interfaces. , These defects normally lead to severe nonradiative recombination, thereby causing device degradation. , To address these critical issues, passivating strategies involving the incorporation of functional molecules or alkali metals through covalent or ionic bonding with defects have been extensively explored to improve photovoltaic performance. , Quite recently, the unbalanced charge extraction between the perovskite active layer and the transport layers has been demonstrated to be a key factor hindering further improvements. − In a typical sandwich-like device structure, carrier extraction and transport between the perovskite active layer, electron transport layer (CTL), and hole transport layer (HTL) significantly influence the performance of PSCs. , Efficient carrier extraction and transport can effectively mitigate issues stemming from charge accumulation, such as band bending, J–V hysteresis, and open-circuit voltage ( V oc ) losses, thereby avoiding unnecessary carrier losses at the perovskite/CTL interface. In addition, the surface of the perovskite, as the terminal end of solution-grown perovskite films, is laden with dangling bonds , and vacancy defects, resulting in severe defect-assisted nonradiative recombination and accumulation of space charge at the interface .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stabilizing Lead Halide Perovskites via an Organometallic Chemical Bridge for Efficient and Stable Photovoltaics

Guo,

Wang,

Min

et al. 2024

ACS Nano

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Defects around the surface and grain boundaries of perovskite films normally cause severe nonradiative recombination and imbalanced charge carrier transport, further limiting both the efficiency and stability of perovskite solar cells (PSCs). To tackle this critical issue, we propose a chemical bridge strategy to reconstruct the interface using organometallic molecules. The commercially available molecule bis-(diphenylphosphino)ferrocene (FcP 2 ), with a unique bridge molecular structure, anchors and chelates Pb atoms by forming strong Pb−P bonds and further passivates both surfaces and grain boundaries. Detailed characterization revealed that bridge molecule FcP 2 reconstruction can effectively suppress nonradiative recombination, and the electron delocalization properties of the ferrocene core can further achieve more balanced interfacial carrier transport. The resultant N-i-P PSC device outputs close to 25% efficiency together with one of the best reported operational stabilities, maintaining over 95% of the initial efficiency after 1000 h of continuous operation at the maximum power point under 1-sun illumination.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stabilizing Lead Halide Perovskites via an Organometallic Chemical Bridge for Efficient and Stable Photovoltaics

Guo,

Wang,

Min

et al. 2024

ACS Nano

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Building Scalable Buried Interface for High‐Performance Perovskite Photovoltaic Devices

Yang,

Qin,

Chen

et al. 2024

Adv Funct Materials

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The quality of the buried interface plays a key role in achieving high‐performance perovskite solar cells (PSCs). However, it is challenging to guarantee its quality on a larger area, which is pivotal for the commercialization of PSCs. Here, a facile strategy is developed to modify the SnO2/perovskite buried interface by incorporating L‐Aspartic acid monosodium salt (ASP‐Na) into SnO2 colloidal dispersion. ASP‐Na with multidentate ligands can coordinate with Sn to form stable dispersion, inhibiting the agglomeration of nanoparticles at the buried interface. In addition, the coordination between ASP‐Na and SnO2 nanoparticles in turn promotes the uniform distribution of ASP‐Na, which facilitates the uniform and effective passivation of the buried defects. Consequently, the ASP‐Na treatment improves the device efficiency from 23.44% to 25.47% (certified 25.02%) with an aperture area of 0.0797 cm2 without hysteresis and enhances the operation stability. The perovskite mini‐module achieves an efficiency of 20.11% with an aperture area of 18.30 cm2, demonstrating the potential of the strategy for scalability.

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Enhancing Durability of Organic–Inorganic Hybrid Perovskite Solar Cells in High‐Temperature Environments: Exploring Thermal Stability, Molecular Structures, and AI Applications

Su,

Ahn,

Yang

2024

Adv Funct Materials

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The commercialization of perovskite solar cells (PSCs), as an emerging industry, still faces competition from other renewable energy technologies in the market. It is essential to ensure that PSCs are durable and stable in high‐temperature environments in order to meet the varied market demands of hot regions or seasons. The influence of high temperatures on the PSCs is complex, encompassing factors such as lattice strain, crystal phase changes, the creation of defects, and ion movement. Furthermore, it intensifies lattice vibrations and phonon scattering, which in turn impacts the migration rate of charge carriers. This review focuses on the durability of organic–inorganic hybrid PSCs under high temperatures. It begins by analyzing the impact of external temperature variations on the internal energy dynamics of PSCs. Subsequently, it outlines the various mechanisms provided by different functional molecules, applied to interface stabilization, grain boundary passivation, crystal growth control, electrode protection, and the development of new hole transport layers, to enhance the thermal stability of PSCs. Additionally, machine learning (ML) is discussed for predicting crystal structure stability, PSCs operational stability, and material screening, with a focus on the potential of deep learning and explainable artifical intelligence (AI) techniques in the commercialization of PSCs.

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Elimination of charge accumulation by a self-assembled cocrystal interlayer for efficient and stable perovskite solar cells

Abstract: A SAM-CL has been introduced in n–i–p perovskite solar cells to optimize interfacial energy level arrangement and eliminate interfacial charge accumulation. The large pyrene rings and F atoms of SAM-CL inhibit severe ion migration and moisture erosion, thus improving device stability.

Cited by 10 publications

References 61 publications

Stabilizing Lead Halide Perovskites via an Organometallic Chemical Bridge for Efficient and Stable Photovoltaics

Stabilizing Lead Halide Perovskites via an Organometallic Chemical Bridge for Efficient and Stable Photovoltaics

Building Scalable Buried Interface for High‐Performance Perovskite Photovoltaic Devices

Enhancing Durability of Organic–Inorganic Hybrid Perovskite Solar Cells in High‐Temperature Environments: Exploring Thermal Stability, Molecular Structures, and AI Applications

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