Tailoring the Interface in FAPbI<sub>3</sub> Planar Perovskite Solar Cells by Imidazole‐Graphene‐Quantum‐Dots

Zuo-ning, Gao; Wang, Yong; Liu, Hui; Sun, Jiayun; Kim, Jin-Wook; Li, Yan; Xu, Baomin; Choy, Wallace C. H.

doi:10.1002/adfm.202101438

Cited by 60 publications

(54 citation statements)

References 31 publications

(33 reference statements)

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“…Moreover, a better energy level alignment between ETL and perovskite can be obtained. [51] Overall, carbon materials and derivatives can enhance the conductivity very well to improve charge transfer. Likewise, it can passivate interface defects and regulate energy level alignment, and the formation of perovskite films.…”

Section: Carbon-based Inorganic Materialsmentioning

confidence: 99%

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Zuo-ning

Wang

Choy

2022

Advanced Energy Materials

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145

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Q limit but the opencircuit voltage (V oc ) and fill factor (FF) are still far below the theoretical values. As we know, both V oc and FF relate to charge carrier dynamics including extraction and transport. Therefore, carrier managements including reducing non-radiative carrier recombination (bulk and interface), series or shunt resistance, and improving carrier extraction and transport are critical to further enhance the power conversion efficiency (PCE) of PSCs. In addition to high efficiency, the stability issues in perovskite must be solved before commercialization.From the standpoint of architecture of PSCs, the PSCs are essentially a heterojunction device with a multilayer construction, which consists of perovskite light absorption layer, carrier transport layer (CTL), and electrodes. [25,30] As a result, the rational design and modification of heterojunction interfaces have become key strategies to harness the full potential of PSCs. [31][32][33][34][35] A lack of in-depth understanding of the heterojunction interfaces and appropriate interface designs, specifically the buried interfaces under polycrystalline perovskite films, is impeding further advancements in perovskite photovoltaic performance and stability. [36][37][38][39][40][41][42] To date, many researches mainly focus on the top surfaces of perovskite. [43][44][45][46][47] However, due to the accumulation of deep-level trap states, it is known that unfavorable non-radiative recombination losses that impede device power outputs exist at the interfaces with bottom contact layers. [41,48] Consequently, it is urgently needed to compromise between these detrimental effects and beneficial effects.However, investigating these issues is more difficult compared with that on the top surfaces of perovskite. There are two kinds of techniques to study the buried interface, which are the in-situ and ex-situ methods. For in-situ method, the sum frequency generation (SFG) vibrational spectroscopy which is a nonlinear interface sensitive spectroscopy is applied to study/ analyze the molecular structure information at the buried interface. [49,50] In addition, the photoluminescence spectroscopy (PL) excited from the glass side can characterize carrier dynamics behavior of buried interface. [51] For ex-situ strategy, the buried interface will expose with a peeling-off method. Then the common characterization methods can be used to analyze exposed the buried surface of perovskite layer, such as PL, scanning electron microscope (SEM), atomic force microscopy (AFM), and Fourier transform infrared spectroscopy (FTIR). [52,53] It is still challenging to find ways to access the buried interfaces to achieve device efficiency limits. [54] Organic-inorganic hybrid perovskite solar cells (PSCs) are promising thirdgeneration solar cells. They exhibit high power conversion efficiency (PCE) and, in theory, can be manufactured with less energy than several more established photovoltaic technologies, particularly solution-processed PSCs. Various materials have been widely utiliz...

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Section: Carbon-based Inorganic Materialsmentioning

confidence: 99%

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Zuo-ning

Wang

Choy

2022

Advanced Energy Materials

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145

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“…For example, Gao et al demonstrated that imidazole bromide‐functionalized graphene quantum dots (I‐GQD) could adjust the lower interface between the ETL and the FAPbI 3 perovskite layer. [ 120 ] On the one hand, I‐GQDs eliminated the surface defects of SnO 2 ETL, achieved better energy‐level alignment between ETL and perovskite to enhance carrier transfer, and inhibited interface charge recombination to reduce voltage loss. On the other hand, the multifunctional groups on the surface of I‐GQDs helped the growth of the FAPbI 3 perovskite film, leading to larger grain size, lower trap density, and longer carrier lifetime, but without remarkable change of the perovskite bandgap ( Figure ).…”

Section: Optimization Of Device Structure and Interface Layersmentioning

confidence: 99%

FAPbI₃ Perovskite Solar Cells: From Film Morphology Regulation to Device Optimization

Tang

et al. 2022

Solar RRL

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Organic–inorganic hybrid perovskite solar cells (PSCs) have attracted great attentions due to their rapid increase of power conversion efficiency (PCE). Although the highest PCE of PSCs (25.7%) has been achieved via using formamidinium lead iodide (FAPbI3) with a suitable bandgap, there is still a lack of systematic analysis on FAPbI3‐based PSCs toward high stability and high efficiency. Herein, the progress in FAPbI3 films and achievements in their high‐efficiency and long‐term stability PSCs are comprehensively reviewed. First, the progress from the aspects of morphology, defect, dimension, and strain for FAPbI3 film optimization is summarized and then the development of FAPbI3 PSCs in both efficiency and stability is discussed. Then, the methods to improve the FAPbI3 film quality by morphology control, defect passivation, dimensional regulation, and strain engineering, as well as strategies to optimize the device structure and interface layers, which are critical to promote device stability and efficiency, are evaluated. Finally, the outlook and strategies for realizing commercialized FAPbI3 PSCs with high efficiency and long lifetime are discussed.

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“…Recently, QDs research aimed at developing good quality QDs for solar cell and biomedical devices and applications [24][25][26][27][28][29][30]. Each application requires unique parameters to Carbon-QDs emit photons that spans from the ultraviolet to infrared energy, at a variance of semiconductor counterpart the photoluminescence comes from different oxidation of graphene that introduced discrete energy levels [19] achieve a good detection limit, such as excitation energy, emission wavelength and yield.…”

Section: Sustainable Qds and Its Application In Solar Cellsmentioning

confidence: 99%

Biosynthesis of quantum dots and their usage in solar cells: insight from the novel researches

et al. 2021

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Quantum dots (QDs) are three-dimensional (3D) quantum confinement materials with confined size on the nanoscale. They are semiconductors, possessing a tunable energy gap in the range of visible light energy. In QDs, the 3D quantum confinements of excitons result in tunable fluorescence emission relying upon the QDs size and shape when excited by monochromatic light. Besides, the attempts to improve their outstanding optoelectronic properties, i.e. superior to those of bulk, thin-film semiconductor and organic dyes, many efforts have been conducted, in recent times, regarding sustainable QDs synthesis aiming at biocompatibility and cost reduction. Among the green synthesis routes of QDs there are two distinguished; namely inorganic QDs and carbon-based QDs. The first route is made of low-bandgap metal chalcogenide either extracted from a living being, e.g. earthworm, or capped with an organic ligand. While, the second route is made of carbon-core and passivating the surface with different functional groups, namely carboxyl, hydroxyl, in addition to amine. These functional groups are derived from coke or organic carbon reservoir, i.e. fruits and their juice, animal, vegetable, spice and waste paper. Numerous fundamental applications of QDs, such as biomedicine, sensing, catalysis, and solar cells, exploit the characteristic fluorescence emission of QDs, quantum yields and their modulation upon interaction with the external environment. In this review, two prototype QDs examples are used to highlight the route to sustainable QDs synthesis and solar cells implementation and some perspectives.

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Tailoring the Interface in FAPbI₃ Planar Perovskite Solar Cells by Imidazole‐Graphene‐Quantum‐Dots

Cited by 60 publications

References 31 publications

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

FAPbI₃ Perovskite Solar Cells: From Film Morphology Regulation to Device Optimization

Biosynthesis of quantum dots and their usage in solar cells: insight from the novel researches

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Tailoring the Interface in FAPbI3 Planar Perovskite Solar Cells by Imidazole‐Graphene‐Quantum‐Dots

Cited by 60 publications

References 31 publications

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

FAPbI3 Perovskite Solar Cells: From Film Morphology Regulation to Device Optimization

Biosynthesis of quantum dots and their usage in solar cells: insight from the novel researches

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Tailoring the Interface in FAPbI₃ Planar Perovskite Solar Cells by Imidazole‐Graphene‐Quantum‐Dots

FAPbI₃ Perovskite Solar Cells: From Film Morphology Regulation to Device Optimization