A conformally bonded molecular interface retarded iodine migration for durable perovskite solar cells

Yuan, Ligang; Zhu, Weiya; Zhang, Yiheng; Li, Yuan; Chan, Christoper Chang Sing; Qin, Minchao; Qiu, Jianhang; Zhang, Kaicheng; Huang, Jiaxing; Wang, Jiarong; Luo, Huiming; Zhang, Zheng; Chen, Ruipeng; Liang, Weixuan; Wei, Qi; Wong, Kam Sing; Lu, Xinhui; Li, Ning; Brabec, Christoph J.; Ding, Liming; Yan, Keyou

doi:10.1039/d2ee03565k

Cited by 40 publications

(26 citation statements)

References 66 publications

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“…This is due to good crystallization and robust perovskite film which mitigate the heating decomposition. [53,54] Apparently, FS greatly improved the stability of perovskite and enabled the device with excellent performance.…”

Section: Resultsmentioning

confidence: 99%

Fluorocarbon Surfactant‐Assisted Large‐Area Uniform and Water‐Resistant Perovskite Films for Efficient Photovoltaics

Wang

Jin

et al. 2023

Solar RRL

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Formamidinium (FA)‐based lead triiodide perovskites are suitable light‐absorbing materials for solar cells due to their narrow bandgap, long‐range charge diffusion length, and excellent thermal stability. However, large‐area uniformity and phase purity are still challenging issues in the two‐step solution processed perovskite films because of the incomplete spreading/reacting of the organic amine salt solution. Herein, a novel multifunctional nonionic fluorocarbon surfactant (FS) is introduced to improve the crystallization of perovskites via the strategy of reducing the surface tension of the organic amine salt solution and facilitating the adequate binding of the organic amine salts with PbI2. Moreover, the FS additives effectively reduce residual PbI2; passivate the surface and interfacial defects of perovskites. The FS modified perovskite solar cells (PSCs) exhibit a champion power conversion efficiency (PCE) of 21.72% (0.16 cm2) with an enhanced stability, and the unencapsulated device maintains about 80% of the initial PCE even after 1000 h of storage. In addition, the larger PSCs with the active area of 1.00 cm2 deliver a peak PCE of 19.19%. Eventually, FS impedes moisture intrusion and effectively mitigates the decomposition of perovskite film. This work opens the way to explore large‐area PSCs with high performance and long‐term stability.

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Section: Resultsmentioning

confidence: 99%

Fluorocarbon Surfactant‐Assisted Large‐Area Uniform and Water‐Resistant Perovskite Films for Efficient Photovoltaics

Wang

Jin

et al. 2023

Solar RRL

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“…Specifically, the semi‐devices featuring a structure of ITO/HTL/control or EDC‐derived perovskite/ETL were fabricated for TA measurements (Figure 4a). In general, the photoinduced charge transfer process usually occurred at a time scale ranging from picoseconds to nanoseconds, and the population of excited charges under different delay times can be probed by adjusting the delay time of pumping light, so that the detailed transition kinetic process from carriers‐excited state to other low‐energy states can be interpreted [49–50] . The contour plot of the TA spectra of both samples are dominated by double ground‐state bleaching (GSB) peaks appeared at ∼640 nm (corresponded to 2D perovskite characteristic signal) and ∼770 nm (corresponded to 3D perovskite characteristic signal), respectively, which agreed well with our previous study [37] .…”

Section: Resultsmentioning

confidence: 99%

Synergic Electron and Defect Compensation Minimizes Voltage Loss in Lead‐Free Perovskite Solar Cells

et al. 2023

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Sn perovskite solar cells have been regarded as one of the most promising alternatives to the Pb‐based counterparts due to their low toxicity and excellent optoelectronic properties. However, the Sn perovskites are notorious to feature heavy p‐doping characteristics and possess abundant vacancy defects, which result in under‐optimized interfacial energy level alignment and severe nonradiative recombination. Here, we reported a synergic “electron and defect compensation” strategy to simultaneously modulate the electronic structures and defect profiles of Sn perovskites via incorporating a traced amount (0.1 mol %) of heterovalent metal halide salts. Consequently, the doping level of modified Sn perovskites was altered from heavy p‐type to weak p‐type (i.e. up‐shifting the Fermi level by ∼0.12 eV) that determinately reducing the barrier of interfacial charge extraction and effectively suppressing the charge recombination loss throughout the bulk perovskite film and at relevant interfaces. Pioneeringly, the resultant device modified with electron and defect compensation realized a champion efficiency of 14.02 %, which is ∼46 % higher than that of control device (9.56 %). Notably, a record‐high photovoltage of 1.013 V was attained, corresponding to the lowest voltage deficit of 0.38 eV reported to date, and narrowing the gap with Pb‐based analogues (∼0.30 V).

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“…7(a)). 72 Owing to the remarkable material and interfacial properties, the device with L3 and an anti-reflection (AR) film achieved a PCE of 22.61% (Fig. 7(b)) and impressive long-term stability.…”

Section: Small Molecule Htmsmentioning

confidence: 99%

A review on conventional perovskite solar cells with organic dopant-free hole-transport materials: roles of chemical structures and interfacial materials in efficient devices

Li,

Zhao,

et al. 2024

J. Mater. Chem. C

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A conformally bonded molecular interface retarded iodine migration for durable perovskite solar cells

Abstract: State-of-the-art n-i-p perovskite solar cells (PSCs) suffer from stability issues due to ionic interdiffusion. Herein, by enlarging indacenodithiophene -bridge donor (D’) to combine with methoxy triphenylamine donor (D) and benzothiadiazole...

Cited by 40 publications

References 66 publications

Fluorocarbon Surfactant‐Assisted Large‐Area Uniform and Water‐Resistant Perovskite Films for Efficient Photovoltaics

Fluorocarbon Surfactant‐Assisted Large‐Area Uniform and Water‐Resistant Perovskite Films for Efficient Photovoltaics

Synergic Electron and Defect Compensation Minimizes Voltage Loss in Lead‐Free Perovskite Solar Cells

A review on conventional perovskite solar cells with organic dopant-free hole-transport materials: roles of chemical structures and interfacial materials in efficient devices

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