Photo-excitation intensity dependent electron and hole injections from lead iodide perovskite to nanocrystalline TiO<sub>2</sub> and spiro-OMeTAD

Makuta, Satoshi; Liu, Maning; Endo, Masaru; Nishimura, Hidetaka; Wakamiya, Atsushi; Tachibana, Yasuhiro

doi:10.1039/c5cc06518f

Cited by 69 publications

(105 citation statements)

References 21 publications

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“…From the previous study [21,24], the film thickness is estimated to be 300 nm. The spectral shape with a shoulder around 750 nm is in agreement with the previous report [18]. Fig.…”

Section: Characterizationsupporting

confidence: 82%

“…The cell structure employed for this study is shown in Scheme 1. As reported previously [18], a mesoporous TiO 2 film acts as an electron acceptor following light absorption by the perovskite layer, and also extends charge separation lifetimes. …”

Section: Introductionmentioning

confidence: 79%

“…We have recently reported the influence of excitation intensity on electron and hole injection dynamics in a mesoporous TiO 2 supported CH 3 NH 3 PbI 3 perovskite film with a spiro-OMeTAD layer [18]. We have identified both injection efficiencies lowers with the increase of the light intensity, and thus concluded that a mesoporous TiO 2 / CH 3 NH 3 PbI 3 perovskite / spiroOMeTAD based solar cells are not suitable to be applied for concentrator PVs.…”

Section: Introductionmentioning

confidence: 99%

“…We speculate that the loss (20~35%) may originate from insufficient charge separation reaction or charge carrier transport. We have recently reported the influence of excitation light intensity on electron and hole injection efficiencies in a mp-TiO 2 /MAPbI 3 /OMeTAD film [18], and have clarified that the high efficiency of the solar cell is essentially achieved by the faster hole injection dynamics. Following this study, although the hole injection efficiency is excitation intensity dependent, we have confirmed the charge Reverse separation efficiency of >98% with the incident light intensity of up to 2 sun.…”

Section: Characterization Of a Perovskite Solar Cellmentioning

confidence: 99%

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Light Intensity Dependence of Performance of Lead Halide Perovskite Solar Cells

Liu

Endo

Shimazaki

et al. 2017

J. Photopol. Sci. Technol.

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Performance of nanoporous TiO 2 based lead iodide perovskite solar cells was investigated under a series of light intensity up to 1.2 sun. The short circuit photocurrent increases linearly with the intensity increase, while the fill factor slightly decreases with the intensity increase. The analysis of logarithmic light intensity dependence of the open circuit voltage revealed a slope of 1.09 kT/q, indicating ideal function of the present solar cells with only bimolecular charge recombination and negligible leakage current. This analysis further suggests that the solar cell performance is improved by simply increasing incident light intensity up to 1.2 sun.

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“…From the previous study [21,24], the film thickness is estimated to be 300 nm. The spectral shape with a shoulder around 750 nm is in agreement with the previous report [18]. Fig.…”

Section: Characterizationsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Characterization Of a Perovskite Solar Cellmentioning

confidence: 99%

See 2 more Smart Citations

Light Intensity Dependence of Performance of Lead Halide Perovskite Solar Cells

Liu

Endo

Shimazaki

et al. 2017

J. Photopol. Sci. Technol.

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“…10 ns). 33,34 However, the 2000 and 3000 rpm samples showed a shorter lifetime¸1 than the sample without PS nanopores, which was different from the trend of the quenching efficiency observed in the steady-state PL measurement. We attribute this to the radiative recombination induced by the porous structure.…”

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confidence: 45%

Investigation of Carrier Dynamics in Templated Perovskite Films with Different Densities of Nanopores

et al. 2017

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Carrier dynamics in templated perovskite films with different densities of nanopores were investigated. We employed colloidal solution processing to obtain templated perovskite films with different number densities of nanopores. X-ray diffraction (XRD) and photoluminescence (PL) measurements confirmed that porous structures dominantly influence a fast carrier decay process such as carrier extraction, while PbI 2 residuals influence a slow carrier decay process.Keywords: Perovskite solar cell | Nanopore density | PbI 2 residualRecently, organo lead halide perovskite CH 3 NH 3 PbX 3 has emerged as a promising candidate for low-cost and highefficiency photovoltaic technologies. 17 Up to now, power conversion efficiency (PCE) of perovskite solar cells (PSCs) has been dramatically improved by employing planar structures, with a dense and smooth perovskite film. On the other hand, perovskite films with porous structures have stimulated great interest since some researchers obtained semi-transparent perovskite films with high optical transmittance 8,9 and periodic change of refractive index, 10,11 which are favorable to apply to various optoelectronic devices such as solar cells, light emitting diodes (LEDs), and lasers. In previous works, tremendous efforts have been devoted to obtaining devices with preferable performance. However, the fundamental carrier dynamics such as carrier extraction and radiative recombination have not been comprehensively discussed. For example, in a solar cell configuration, it was reported that the electron extraction from a perovskite layer to an electron-transporting layer (ETL) was suppressed by poor surface coverage of TiO 2 by perovskite.12 However, high PCE was exclusively aimed and the impact of surface coverage on electron extraction was not intensively investigated. For the purpose of designing optoelectronic devices with porous structures, the correlation between the number densities of nanopores and carrier dynamics needs to be systematically investigated.Herein, we employed polystyrene (PS) nanospheres, which are commonly used in templating techniques, to fabricate templated perovskite films with porous structures as illustrated in Figure 1a. The impact of porous structures on carrier extraction was investigated by photoluminescence (PL) measurement in a solar cell configuration with a TiO 2 compact layer as an ETL, where templated perovskite films with different number densities of nanopores were fabricated by changing the spinning speeds of PS colloidal solution.The fabrication process of the templated perovskite films is illustrated in Figure 1b. For the fabrication of templated perovskite, we firstly fabricated porous PbI 2 films using PS nanospheres and then perovskite (CH 3 NH 3 PbI 3 ) was formed based on a successive spin-coating/annealing (SSCA) method. 13The detailed experimental information can be found in Supporting Information.Firstly, we observed the surface morphology of PS films deposited by various spinning speeds. Figures 2a2c show the SEM images of the PS fil...

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Wide‐Bandgap Perovskite‐Inspired Materials: Defect‐Driven Challenges for High‐Performance Optoelectronics

Grandhi,

Hardy,

Krishnaiah

et al. 2023

Adv Funct Materials

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The remarkable success of lead halide perovskites (LHPs) in photovoltaics and other optoelectronics is significantly linked to their defect tolerance, although this correlation remains not fully clear. The tendency of LHPs to decompose into toxic lead‐containing compounds in the presence of humid air calls for the need of low‐toxicity LHP alternatives comprising of cations with stable oxidation states. To this aim, a plethora of low‐dimensional and wide‐bandgap perovskite‐inspired materials (PIMs) are proposed. Unfortunately, the optoelectronic performance of PIMs currently lags behind that of their LHP‐based counterparts, with a key limiting factor being the high concentration of defects in PIMs, whose rich and complex chemistry is still inadequately understood. This review discusses the defect chemistry of relevant PIMs belonging to the halide elpasolite, vacancy‐ordered double perovskite, pnictogen‐based metal halide, Ag‐Bi‐I, and metal chalcohalide families of materials. The defect‐driven optical and charge‐carrier transport properties of PIMs and their device performance within and beyond photovoltaics are especially discussed. Finally, a view on potential solutions for advancing the research on wide‐bandgap PIMs is provided. The key insights of this review will help to tackle the commercialization challenges of these emerging semiconductors with low toxicity and intrinsic air stability.

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Photo-excitation intensity dependent electron and hole injections from lead iodide perovskite to nanocrystalline TiO₂ and spiro-OMeTAD

Cited by 69 publications

References 21 publications

Light Intensity Dependence of Performance of Lead Halide Perovskite Solar Cells

Light Intensity Dependence of Performance of Lead Halide Perovskite Solar Cells

Investigation of Carrier Dynamics in Templated Perovskite Films with Different Densities of Nanopores

Wide‐Bandgap Perovskite‐Inspired Materials: Defect‐Driven Challenges for High‐Performance Optoelectronics

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Photo-excitation intensity dependent electron and hole injections from lead iodide perovskite to nanocrystalline TiO2 and spiro-OMeTAD

Cited by 69 publications

References 21 publications

Light Intensity Dependence of Performance of Lead Halide Perovskite Solar Cells

Light Intensity Dependence of Performance of Lead Halide Perovskite Solar Cells

Investigation of Carrier Dynamics in Templated Perovskite Films with Different Densities of Nanopores

Wide‐Bandgap Perovskite‐Inspired Materials: Defect‐Driven Challenges for High‐Performance Optoelectronics

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Photo-excitation intensity dependent electron and hole injections from lead iodide perovskite to nanocrystalline TiO₂ and spiro-OMeTAD