Searching for stability at lower dimensions: current trends and future prospects of layered perovskite solar cells

Gangadharan, Deepak Thrithamarassery; Ma, Dongling

doi:10.1039/c9ee01591d

Cited by 150 publications

(106 citation statements)

References 205 publications

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“…To tackle this problem, one of the proposed solutions is to use 2D perovskites such as those of the Ruddlesden-Popper family to increase the stability with respect to moisture. 6,7 Mixing compositions of 2D/3D LHPs has been shown to increase the stability while maintaining a good performance. 8,9 These lower dimensionality perovskites are obtained by introducing larger cations into the precursor mix.…”

Section: Introductionmentioning

confidence: 99%

Exciton and Carrier Dynamics in Two-Dimensional Perovskites

Burgos‐Caminal

Socie

Bouduban

et al. 2020

J. Phys. Chem. Lett.

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2D perovskites has become a major topic in the field of perovskite optoelectronics. Here, we aim to unravel the ultrafast dynamics governing the evolution of charge carriers and excitons. We use a combination of ultrabroadband time-resolved THz spectroscopy (TRTS) and fluorescence upconversion spectroscopy to observe and model this evolution. We find that sequential carrier cooling and exciton formation best explain the observed dynamics, where exciton-exciton interactions play an important role in the form of Auger heating and biexciton formation. In fact, we can show that the presence of a longer-lived population of carriers is due to these processes and not to a Mott transition. Therefore, in these materials, excitons still dominate at laser spectroscopy excitation densities. We use kinetic modeling to compare the phenethylammonium and butylammonium organic cations while investigating the stability of the resulting films. In addition, we demonstrate the capability of using ultrabroadband TRTS to study excitons in large binding energy semiconductors through spectral analysis at room temperature.

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Section: Introductionmentioning

confidence: 99%

Exciton and Carrier Dynamics in Two-Dimensional Perovskites

Burgos‐Caminal

Socie

Bouduban

et al. 2020

J. Phys. Chem. Lett.

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“…Organic–inorganic hybrid perovskite solar cells (PVSCs) have been regarded as a promising candidate for next‐generation photovoltaics (PVs) due to their various unique properties, including high absorption coefficients, large charge carrier mobilities, long electron/hole diffusion lengths, facile solution processability, and low fabrication cost . However, the volatile nature of organic cations such as methylammonium (MA + ), formamidinium (FA + ), and so on in these perovskites causes some stability issues under the light, photo, and thermal stresses . Alternatively, inorganic cations such as Cs + ions have been reported that can potentially replace organic cations to address these stability issues .…”

Section: Best and Average (Reverse Scan) Pv Parameters Measured In Rementioning

confidence: 99%

Interfacial Modification through a Multifunctional Molecule for Inorganic Perovskite Solar Cells with over 18% Efficiency

Liu

Zhang

et al. 2020

Solar RRL

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A highly effective interface engineering approach uses a multifunctional molecule, 5‐amino‐2,4,6‐triiodoisophthalic acid (ATPA), to anchor on TiO2 and CsPbI3 simultaneously by reacting with dangling hydroxyl groups on TiO2 surfaces and passivating the defects of CsPbI3 films. In addition, the introduction of ATPA results in cascade energy‐level alignment between the perovskite and TiO2 electron‐transporting layer (ETL) to improve the electron extraction property. Based on the ATPA‐modified TiO2 substrates, optimized CsPbI3 perovskite solar cells (PVSCs) deliver the highest power conversion efficiency (PCE) of over 18% with suppressed hysteresis. Moreover, the unencapsulated TiO2/ATPA‐based devices exhibit much better long‐term stability and photostability than the only TiO2‐based devices.

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“…Another concept is the use of bulkier hydrophobic organic cations to replace the hygroscopic MA and FA organic ions. Due to tolerance factors, the use of a large bulkier organic cation results in the transformation of the 3D perovskites into the 2D layered perovskite structure, which is environmentally more stable [60,61]. Although more efforts to enhance device efficiency are required [62], the adoption of 2D/3D hybrid structures or 2D interlayers is promising routes to explore the advantages of both types of perovskites.…”

Section: D Pscsmentioning

confidence: 99%

Multi-component engineering to enable long-term operational stability of perovskite solar cells

Xie

Lira‐Cantú

2020

J. Phys. Energy

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With a record efficiency above 25%, the main hurdle for the commercialization of perovskite solar cells (PSCs) is their long-term operational stability. Although different strategies have been applied, the stability of PSCs is still far below the 25 year requirement demonstrated by commercial photovoltaic technologies. To advance in the former, a lab-scale stability analysis should resemble real testing conditions, and this is only possible through the interaction of several stress factors. Here, we briefly introduce the reader to the general degradation mechanisms observed on PSCs and the state-of-the-art strategies applied to realize long-term stable devices. Finally, we highlight the imperative need to engineer multiple components of the PSCs simultaneously and propose a rational design of PSC's constituents to obtain long-term operational solar cells. This perspective article will benefit the progression of PSCs as a reliable photovoltaic technology.

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Searching for stability at lower dimensions: current trends and future prospects of layered perovskite solar cells

Abstract: Two-dimensional perovskites are an attractive alternative to 3D perovskites for solar cell application as they directly address a critical issue of stability of 3D perovskite solar cells, while achieving similarly high power conversion efficiencies.

Cited by 150 publications

References 205 publications

Exciton and Carrier Dynamics in Two-Dimensional Perovskites

Exciton and Carrier Dynamics in Two-Dimensional Perovskites

Interfacial Modification through a Multifunctional Molecule for Inorganic Perovskite Solar Cells with over 18% Efficiency

Multi-component engineering to enable long-term operational stability of perovskite solar cells

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