Dynamic Luminescent Biosensors Based on Peptides for Oxygen Determination

Souza, Geovany Albino de; Martins, Tatiana Duque; Colmati, Flávio

doi:10.5772/intechopen.84143

Cited by 1 publication

(2 citation statements)

References 37 publications

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“…[61] This shows that it is possible for an excited perovskite crystallite to transfer both-electrons and holes-to a water molecule via a redox process. Previous results by Nickel [67] H 2 O, N 2 , and Ar on CsMAFA layers. NHE stands for normal hydrogen electrode.…”

Section: Analysis Of Plq Mechanismsmentioning

confidence: 78%

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Unraveling Reversible Quenching Processes of O₂, N₂, Ar, and H₂O in Metal Halide Perovskites at Moderate Photon Flux Densities

Nandayapa

Hirselandt

Boeffel

et al. 2020

Advanced Optical Materials

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However, to push the efficiency of this material class further, it is important to understand nonradiative recombination pathways upon photoexcitation under inert conditions as well as in the presence of atmospheric gases. Photoluminescence (PL) quantum efficiency, along with time resolved photoluminescence, provides easy-to-access key parameters that assess the quality of perovskite materials. Such techniques have been adopted by a vast number of groups to study the physical properties of MHP materials of different composition. [5][6][7] Yet, the effect that H 2 O, O 2 , and other gases have on the MHP PL has mostly been investigated under high power illumination with photon flux densities surpassing 10 20 photons s −1 m −2 , i.e., the equivalent of 100 suns and more. [5,6,8] Most of these studies focus on the degradation mechanisms of the material and the long-term stability of devices under diverse environmental conditions. However, the immediate and reversible PL quenching (PLQ) in MHP by different atmospheric molecules, at discrete pressure points and at low excitation densities of 1-10 suns, have not yet been looked at systematically. Given the fact that solar cells mostly operate at such moderate excitation density conditions, it is therefore obligatory to study the ongoing photophysical processes in more detail within this low excitation regime.In this report, we present a systematic study on the nature of second-order PLQ effects of O 2 , N 2 , Ar, and H 2 O on the so-called triple cation perovskite, or CsMAFA, containing cations of cesium, methylammonium (MA), and formamidinium (FA) as well as a mixture of bromide and iodide as anions. CsMAFA was chosen as a model material due to its superior film formation and stability, as opposed to the more common methylammonium lead triiodide (MAPbI 3 ). [9,10] We, however, note that all findings presented here also hold true in MAPbI 3 under low excitation densities. [11] By examining the PL emission and PL lifetimes, second-order quenching processes induced by the tested gas molecules, namely O 2 , N 2 , and Ar, as well as for H 2 O, are investigated quantitatively. The Stern-Volmer (SV) analysis is then applied to PL emission and lifetime measurements at different partial pressures for each gas to identify the nature of the quenching process and the underlaying diffusion kinetics. Metal halide perovskites (MHP), as used in photovoltaic (PV) applications,show a rich photophysics in inert and ambient atmosphere. The presence of atmospheric molecules leads to processes that enhance as well as reduce their photoluminescence (PL) emission. Various phenomena are previously described for a wide variety of gas molecules and different classes of MHP, with a particular interest on the long-term stability for PV applications. However, reversible PL quenching (PLQ) processes, which may be regarded equally important for the performance of PV and other optoelectronic applications, are neglected in other studies. This holds true for O 2 and H 2 O, but especially for low-reacti...

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Section: Analysis Of Plq Mechanismsmentioning

confidence: 78%

“…Figure 3. Quenching mechanism diagrams of O 2 ,[67] H 2 O, N 2 , and Ar on CsMAFA layers. NHE stands for normal hydrogen electrode [61].…”

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confidence: 99%

Unraveling Reversible Quenching Processes of O₂, N₂, Ar, and H₂O in Metal Halide Perovskites at Moderate Photon Flux Densities

Nandayapa

Hirselandt

Boeffel

et al. 2020

Advanced Optical Materials

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Dynamic Luminescent Biosensors Based on Peptides for Oxygen Determination

Cited by 1 publication

References 37 publications

Unraveling Reversible Quenching Processes of O₂, N₂, Ar, and H₂O in Metal Halide Perovskites at Moderate Photon Flux Densities

Unraveling Reversible Quenching Processes of O₂, N₂, Ar, and H₂O in Metal Halide Perovskites at Moderate Photon Flux Densities

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Dynamic Luminescent Biosensors Based on Peptides for Oxygen Determination

Cited by 1 publication

References 37 publications

Unraveling Reversible Quenching Processes of O2, N2, Ar, and H2O in Metal Halide Perovskites at Moderate Photon Flux Densities

Unraveling Reversible Quenching Processes of O2, N2, Ar, and H2O in Metal Halide Perovskites at Moderate Photon Flux Densities

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Unraveling Reversible Quenching Processes of O₂, N₂, Ar, and H₂O in Metal Halide Perovskites at Moderate Photon Flux Densities

Unraveling Reversible Quenching Processes of O₂, N₂, Ar, and H₂O in Metal Halide Perovskites at Moderate Photon Flux Densities