Photon Emission and Reabsorption Processes in 
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 Single Crystals Revealed by Time-Resolved Two-Photon-E

Yamada, Takumi; Yamada, Yasuhiro; Nakaike, Yumi; Wakamiya, Atsushi; Kanemitsu, Yoshihiko

doi:10.1103/physrevapplied.7.014001

Cited by 126 publications

(160 citation statements)

References 33 publications

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“…We also derived © = 0.54 from the absorption coefficient and spontaneous emission spectrum. 22 Finally, we obtain¯P L = 0.85 from eq 9. This very high internal quantum efficiency means that perovskite semiconductors have a high potential for use in optoelectronic devices, such as solar cells, light emitting diodes, and lasers.…”

Section: Photon Recycling Effects In Halide Perovskite Single Crystalsmentioning

confidence: 99%

“…Similar time-dependent PL peak shifts were observed for MAPbBr 3 single crystals. 21,22 To clarify the origin of the difference between the PL spectra of thin films and single crystals, we compared the timeresolved PL under one-photon and two-photon excitation. One photon excitation refers to an excitation with a single photon with energy equal to or above bandgap.…”

Section: Photon Recycling Effects In Halide Perovskite Single Crystalsmentioning

confidence: 99%

“…22 The photon propagation length is defined as the mean distance that the emitted photon propagates through the crystal until reabsorption, and is calculated from optical absorption and spontaneous emission spectra. Since the mean depth of the photocarrier distribution, ¤, corresponds to the effective carrier diffusion length, we can obtain the cycle of the photon emission and reabsorption, N PR .…”

Section: Photon Recycling Effects In Halide Perovskite Single Crystalsmentioning

confidence: 99%

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Free Carrier Radiative Recombination and Photon Recycling in Lead Halide Perovskite Solar Cell Materials

Yamada

Kanemitsu

2017

Bulletin of the Chemical Society of Japan

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Organic-inorganic hybrid lead halide perovskites are currently a most attractive class of materials since they have emerged as a solar cell material that realizes both high efficiency and simple low-cost fabrication. The power conversion efficiencies of perovskite solar cells now exceed 22%, which is comparable to that of commercially available CIGS and CdTe thin film solar cells. The key to further improvement is understanding the physical origin of the high efficiency of the perovskite solar cells, and a tremendous effort to come closer to this target has been made through numerous experiments.In this review article, we discuss the optoelectronic properties of perovskite CH 3 NH 3 PbX 3 (X = I and Br) solar cell materials. Special attention is given to the free carrier recombination and photon recycling (the re-absorption of photons emitted by radiative recombination of photocarriers) processes in CH 3 NH 3 PbX 3 single crystals, because a deep understanding of these processes is crucial for improving the solar cell performance. Lead halide perovskites show unique optical properties, e.g., extremely high quantum efficiency of luminescence, small Urbach tail in the absorption spectra, and long lifetime of photocarriers, which all suggest a low density of

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Section: Photon Recycling Effects In Halide Perovskite Single Crystalsmentioning

confidence: 99%

Section: Photon Recycling Effects In Halide Perovskite Single Crystalsmentioning

confidence: 99%

Section: Photon Recycling Effects In Halide Perovskite Single Crystalsmentioning

confidence: 99%

See 1 more Smart Citation

Free Carrier Radiative Recombination and Photon Recycling in Lead Halide Perovskite Solar Cell Materials

Yamada

Kanemitsu

2017

Bulletin of the Chemical Society of Japan

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“…The significance of these processes for the optical responses has been supported by the analysis of spatially resolved PL. 98 The positive and negative effects of photon recycling on the performance of solar cells and LEDs are still to be clarified, because they make the details of the light extraction process much more complicated.…”

Section: Organic-inorganic Hybrid Perovskite: Ch 3 Nh 3 Pbimentioning

confidence: 99%

“…[96][97][98] The thin film PL spectra are complicated, because they depend on the grain size 82,99 and the two different crystal phases of the perovskite coexist at low temperatures. 85,100,101 Investigations on a high quality single crystal allows to clarify the fundamental optical properties of the halide lead perovskite.…”

Section: Organic-inorganic Hybrid Perovskite: Ch 3 Nh 3 Pbimentioning

confidence: 99%

Review—Light Emission from Thin Film Solar Cell Materials: An Emerging Infrared and Visible Light Emitter

Kanemitsu

Okano

Phuong

et al. 2017

ECS J. Solid State Sci. Technol.

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In the last decade, there have been extensive studies on fabrication and physics of thin-film solar cell materials and devices. Many high-efficiency solar cell devices have been developed, and the knowledge gained in these studies can be used advantageously to produce bright light-emitting devices. In this review, we summarize recent luminescence spectroscopic studies on new solar-cell materials and discuss their photocarrier dynamics with respect to efficient light emission. © The Author(s) This special issue focuses on fundamental researches and applications for light emitters and phosphors in the infrared and visible spectral region. Here, we would like to introduce novel approaches, applying insights from thin-film solar-cell materials to the development of new light emitting materials. Recent progress in fundamental research on solar cells is remarkable as novel materials such as perovskite thin films, quantum dots, and colloidal nanocrystals being applied to fabrication of solar cells. Huge efforts in this fundamental research area lead to conversion efficiency improvements for many types of solar cells.1 There exist global demands and attention in establishments of affordable, flexible, light-weight and high conversionefficiency devices.The prerequisite as a light absorber for high-efficiency thin-film solar cells, is a direct band-gap semiconductor with large absorption coefficient and band-gap in the near infrared and visible spectral region. 2One of the best indicators of the intrinsic material quality of a semiconductor, which in turn directly determines the carrier loss in a device, is the internal luminescence quantum efficiency. Therefore, highly luminescent semiconductors are excellent light absorber materials for solar cells [3][4][5][6][7][8] and allow for high open-circuit voltages. 2,9 Reversely, excellent solar-cell light absorber materials could be excellent lightemitting materials. In fact, the electroluminescence (EL) measurement is a well-established and widely-used technique for characterizing solar cell devices.10-17 Furthermore, time-resolved photoluminescence (PL) spectroscopy based on modern laser techniques have revealed the charge carrier flow in bulk materials as well as in devices.18-23 PL and EL spectroscopy techniques are not limited to material characterization, but are also able to characterize devices. Taking account of these close relations, utilizing insights and understandings obtained from solar cell research is strategic for developments in novel luminescent materials and devices in the near infrared and visible spectral region.In this short review, we briefly summarize luminescence properties of thin-film solar cell materials that have been recently developed as thin-film light absorbers. By further discussing the photocarrier dynamics, we are able to understand how these materials can be used optimally as light emitters in novel devices. The abundant information from solar cell research can be applied to other devices as well. A deep understanding of the carrier phy...

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Photoluminescence Properties

Yamada,

Kanemitsu

2021

Hybrid Perovskite Solar Cells

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Photon Emission and Reabsorption Processes in CH3NH3PbBr3 Single Crystals Revealed by Time-Resolved Two-Photon-E

Cited by 126 publications

References 33 publications

Free Carrier Radiative Recombination and Photon Recycling in Lead Halide Perovskite Solar Cell Materials

Free Carrier Radiative Recombination and Photon Recycling in Lead Halide Perovskite Solar Cell Materials

Review—Light Emission from Thin Film Solar Cell Materials: An Emerging Infrared and Visible Light Emitter

Photoluminescence Properties

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