BaY2F8 doped with Er3+: An upconverter material for photovoltaic application

Boccolini, Alessandro; Faoro, R.; Favilla, E.; Veronesi, S.; Tonelli, M.

doi:10.1063/1.4817171

Cited by 29 publications

(22 citation statements)

References 20 publications

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“…Unfortunately, the normalized figures‐of‐merit also depend on the irradiance, because the slope of the UCQY decreases with the irradiance. This behavior was discussed in several articles, both for the normalized UCQY and for ζ . In general, higher normalized figures‐of‐merit are found for less intense excitation.…”

Section: Definitions and Figures‐of‐meritmentioning

confidence: 75%

“…This relation is known as the energy gap law. A large variety of different host materials with appropriately low phonon energies to suppress nonradiative losses have been proposed to be suitable host materials for Ln 3+ and the upconversion mechanisms have been discussed . The most frequently investigated upconversion materials are from the sodium rare‐earth tetrafluoride (NaREF 4 ) family, in most cases in the hexagonal crystal structure ( β ‐phase), the rare‐earth oxide (RE 2 O 3 ) or oxysulfide (RE 2 O 2 S) and Ln 3+ ‐doped glasses or glass ceramics .…”

Section: Upconverter Materialsmentioning

confidence: 99%

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Upconversion for Photovoltaics – a Review of Materials, Devices and Concepts for Performance Enhancement

Goldschmidt

Fischer

2015

Advanced Optical Materials

413

266

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Upconversion of low‐energy photons into high‐energy photons increases the efficiency of photovoltaic devices by converting photons with energies below the absorption threshold of the solar cell into photons that can be utilized. In this review, an overview is provided of quantitative studies of the upconversion quantum yield of upconverter materials, and of the achieved efficiency enhancements in upconverting solar cell devices. Different materials and devices are compared based on well‐defined figures‐of‐merit and the challenges to their accurate measurement are discussed. Internal upconversion quantum yields above 13% have been reported both for Er3+‐based materials as well as for organic upconverters, using irradiance values below 0.4 W cm−2. On the upconverting solar cell device level, relative enhancements of the solar cells' short‐circuit currents by up to 0.55% have been achieved. These values document progress by orders of magnitude achieved in the last years. However, they also show that the field of upconversion needs further development to become a relevant technology option in photovoltaics. Different options regarding how upconversion performance can be increased further in the future are outlined.

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Section: Definitions and Figures‐of‐meritmentioning

confidence: 75%

Section: Upconverter Materialsmentioning

confidence: 99%

Upconversion for Photovoltaics – a Review of Materials, Devices and Concepts for Performance Enhancement

Goldschmidt

Fischer

2015

Advanced Optical Materials

413

266

View full text Add to dashboard Cite

show abstract

“…235 The first demonstration of such PV systems with incorporated UC materials was made by Güdel et al in 2005 with an amorphous Si solar cell. 238,239 Similar to the Si-based solar cells, the incorporation of UC phosphor into TiO 2 -based dye sensitized solar cells (DSSCs) as well as polymer based cells also demonstrated enhanced NIR response. In a proof-of-concept demonstration, a highest EQE of 2.5 AE 0.2% was obtained under the excitation by a laser diode at 1523 nm.…”

Section: Utilization Of Nir Light In Solar Cells By Ucmentioning

confidence: 99%

Recent advances in energy transfer in bulk and nanoscale luminescent materials: from spectroscopy to applications

2015

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Transfer of energy occurs endlessly in our universe by means of radiation. Compared to energy transfer (ET) in free space, in solid state materials the transfer of energy occurs in a rather confined manner, which is usually mediated by real or virtual particles, including not only photons, but also electrons, phonons, and excitons. In the present review, we discuss the recent advances in optical ET by resonance mediated with photons in solid materials as well as their nanoscale counterparts, with focus on the photoluminescence behavior pertaining to ET between optically active centers, such as rare earth (RE) ions. This review begins with a brief discussion on the classification of optical ET together with an overview of the theoretical formulations and experimental method for the examination of ET. We will then present a comprehensive discussion on the ET in practical systems in which normal photoluminescence, upconversion and quantum cutting resulted from ET involving metal ions, QDs, organic species, 2D materials and plasmonic nanostructures. Diverse ET systems are therefore simply categorized into cases of ion-ion interactions and non-ion interactions. Special attention has been paid to the progress in the manipulation of spatially confined ET in nanostructured systems including core-shell structures, as well as the ET in multiple exciton generation found in QDs and organic molecules, which behave quite similarly to resonance ET between metal ion centers. Afterwards, we will discuss the broad spectrum of applications of ET in the aforementioned systems, including solid state lighting, solar energy utilization, bio-imaging and diagnosis, and sensing. In the closing part, along with a short summary, we discuss further research focus regarding the problems and possible future directions of optical ET in solids.

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“…The overlap can be quite large in RE ions due to their atomic-like spectra. Recently, a self-absorption loss mechanism has been reported in erbium (Er 3 )-doped barium yttrium fluoride (BaY 2 F 8 ) where it has been minimized by experimentally optimizing the thickness of the sample [13]. Moreover, an optical model describing how the self-absorption affects PLQY measurements in a DC luminescent material has been demonstrated in [11].…”

mentioning

confidence: 99%

Self-absorption in upconverter luminescent layers: impact on quantum yield measurements and on designing optimized photovoltaic devices

Boccolini¹,

Marqués-Hueso²,

Richards³

2014

Opt. Lett.

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This Letter details a theoretical investigation of self-absorption within an upconverter (UC) material, consisting of trivalent erbium (Er3+)-doped hexagonal sodium yttrium fluoride (β-NaYF4) and its implications on two experimental situations: the case of a quantum yield measurement, and on the effective performance in a UC-enhanced photovoltaic (PV) device. The study demonstrates that an optimization of the thickness is essential in order to reduce the effect of self-absorption and maximize the possible additional photocurrent that could be harvested. It also has been found that the external photoluminescence quantum yield (ePLQY) measured through an integrating sphere may result in an underestimation with respect to the performance that the UC material could achieve in a UC-PV device. Finally, it has been found the optimal thickness and the molar concentration of Er3+ ions are inversely proportional, suggesting that an optimal number (1.3-2.9·10(17)) of Er3+ ions should be contained within the UC layer.

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BaY2F8 doped with Er3+: An upconverter material for photovoltaic application

Cited by 29 publications

References 20 publications

Upconversion for Photovoltaics – a Review of Materials, Devices and Concepts for Performance Enhancement

Upconversion for Photovoltaics – a Review of Materials, Devices and Concepts for Performance Enhancement

Recent advances in energy transfer in bulk and nanoscale luminescent materials: from spectroscopy to applications

Self-absorption in upconverter luminescent layers: impact on quantum yield measurements and on designing optimized photovoltaic devices

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