Nanoscale spatial mapping of charge carrier dynamics in perovskite solar cells

Bahrami, Behzad; Chowdhury, Ashraful Haider; Gurung, Ashim; Mabrouk, Sally; Reza, Khan Mamun; Rahman, Sheikh Ifatur; Pathak, Rajesh; Qiao, Qiquan

doi:10.1016/j.nantod.2020.100874

Cited by 24 publications

(28 citation statements)

References 67 publications

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“…angle), which is not mentioned in most works. [92] iii) The photoelectron properties of the GBs are sensitive to the type of defect, which depends on the composition of the material and the preparation method. [93] Therefore, for the future development and application of PSCs, it is indispensable to select appropriate material analysis and characterization methods to obtain accurate crystallographic information.…”

Section: Grain Boundarymentioning

confidence: 99%

Origin, Influence, and Countermeasures of Defects in Perovskite Solar Cells

Lei

Wang

et al. 2021

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Defects are considered to be one of the most significant factors that compromise the power conversion efficiencies and long‐term stability of perovskite solar cells. Therefore, it is urgent to have a profound understanding of their formation and influence mechanism, so as to take corresponding measures to suppress or even completely eliminate their adverse effects on device performance. Herein, the possible origins of the defects in metal halide perovskite films and their impacts on the device performance are analyzed, and then various methods to reduce defect density are introduced in detail. Starting from the internal and interfacial aspects of the metal halide perovskite films, several ways to improve device performance and long‐term stability including additive engineering, surface passivation, and other physical treatments (annealing engineering), etc., are further elaborated. Finally, the further understanding of defects and the development trend of passivation strategies are prospected.

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Section: Grain Boundarymentioning

confidence: 99%

Origin, Influence, and Countermeasures of Defects in Perovskite Solar Cells

Lei

Wang

et al. 2021

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“…Our measured apparent τ t and τ r values are in good agreement with other reports on the perovskite films. [ 88–91 ]…”

Section: Resultsmentioning

confidence: 99%

“…Our measured apparent τ t and τ r values are in good agreement with other reports on the perovskite films. [88][89][90][91] Figure S6, Supporting Information, shows the comparison of efficiencies, apparent charge transport time, and carrier recombination lifetime from simulation and experimental results. PSCs with a capping layer thickness of 400 nm gave optimum efficiency in simulation, and experimental results showed optimum efficiency at a spin speed of 4000 rpm, which is equivalent to an active layer thickness of 380 nm.…”

Section: Iðtþ ¼ δQðtþmentioning

confidence: 99%

“…Our measured apparent τ t and τ r values are in good agreement with other reports on the perovskite films. [88][89][90][91] Simulation and experimental results include the efficiencies, τ t and τ r , of solar cells simulated with different capping layer coverage and solar cells fabricated with different PbI 2 concentrations, respectively. The efficiencies, τ t and τ r , of PSCs improved by increasing the coverage of the capping layer (as shown in Table S1, Supporting Information).…”

Section: Iðtþ ¼ δQðtþmentioning

confidence: 99%

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Kinetic Monte Carlo Simulation of Perovskite Solar Cells to Probe Film Coverage and Thickness

Bahrami

Mabrouk

Gurung

et al. 2021

Adv Energy and Sustain Res

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Perovskite solar cells (PSCs) have received considerable attention in recent years due to their low processing cost and high‐power conversion efficiency. However, the mechanisms of PSCs are not fully understood. A model based on a probabilistic and statistical approach needs to be developed to simulate, optimize, and predict the photovoltaic (PV) performance of PSC. Herein, the 3D model based on the kinetic Monte Carlo (KMC) approach is developed to simulate 3D morphology of perovskite‐based solar cells and predict their PV performances and charge dynamics. The developed 3D model incorporates the temporal and physical behavior of perovskites, such as charge generation, transport, and recombination. The KMC simulation results show that pin holes‐free perovskite films with a homogenous 400 nm thick perovskite capping layer achieve the highest power conversion efficiency of 20.85%. However, the shortest apparent charge transport time (τt) and the longest apparent charge carrier recombination lifetime (τr) are found for the champion device. PV performance from the fabricated device is used to validate this simulation model. This model can provide a significant conceptual advance in identifying bottlenecks and guiding novel device designs to further improve the performance of perovskite PVs.

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“…The main distinguishing characteristics of hybrid perovskites are: 1) low electron and hole effective masses [ 45 ] ; 2) high carrier mobility of both electron and holes (13–15 cm 2 V −1 s −1 ); [ 46 ] 3) long carrier lifetime (on the order of tenths of μs); [ 47 ] 4) high charge carrier diffusion length (>μm) [ 46 ] ; 5) ambipolar behavior with good charge carrier separation; 6) tunable direct bandgap (1.47–2 eV); [ 48 ] 7) large absorption coefficient (1.5 × 10 5 cm −1 ); [ 48 ] 8) high dielectric constant (60 at low frequency); [ 49,50 ] and 9) low exciton binding energy (few meV). [ 45 ]…”

Section: Organic and Perovskite‐based Solar Cellsmentioning

confidence: 99%

Toward Real Setting Applications of Organic and Perovskite Solar Cells: A Comparative Review

et al. 2021

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The development of efficient, reliable, and clean energy sources is one of the global priorities for enabling a sustainable transition toward a green society and economy. The third‐generation solar cells, such as organic solar cells (OSCs) and perovskite solar cells (PSCs), are among the most promising platforms for the generation of electrical power from sunlight for a wide range of applications. However, the widespread diffusion of emerging photovoltaics technologies is hampered by issues occurring in the translation of laboratory‐scale R&D efforts to real settings. Herein, starting from a thorough survey of latest research on OSC and PSC technologies, critical factors related to fabrication and operation of solar cells, especially in terms of materials properties/requirements and beyond metrics built on efficiency only, are analyzed. On this basis, OSCs and PSCs are compared in terms of their potential in real application scenarios, also highlighting their peculiarities in view of their future large‐scale utilization.

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Nanoscale spatial mapping of charge carrier dynamics in perovskite solar cells

Cited by 24 publications

References 67 publications

Origin, Influence, and Countermeasures of Defects in Perovskite Solar Cells

Origin, Influence, and Countermeasures of Defects in Perovskite Solar Cells

Kinetic Monte Carlo Simulation of Perovskite Solar Cells to Probe Film Coverage and Thickness

Toward Real Setting Applications of Organic and Perovskite Solar Cells: A Comparative Review

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