Accurate determination of the onset wavelength (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg"><mml:msub><mml:mi>λ</mml:mi><mml:mrow><mml:mi mathvariant="normal">onset</mml:mi></mml:mrow></mml:msub></mml:math>) in optical spectroscopy

Wallace, Austin M.; Curiac, Christine; Delcamp, Jared H.; Fortenberry, Ryan C.

doi:10.1016/j.jqsrt.2021.107544

Cited by 44 publications

(16 citation statements)

References 25 publications

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“…[b] Photoluminescence quantum yields were obtained using quinine sulfate as a reference. [c] The formula: 1240 (eV/nm)/ λ onset (nm), [13] gave the triplet states (T 1 ) energy, with λ onset being the high‐energy onset of the emission spectra [13b] …”

Section: Resultsmentioning

confidence: 99%

Ruthenium (II) Complexes Bearing Heteroleptic Terpyridine Ligands: Synthesis, Photophysics and Solar Energy Conversion

et al. 2021

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Heteroleptic ruthenium (II) complexes featuring donor functionalized phenyl‐terpyridine (ph‐tpy) and a monocarboxylic‐(ph‐tpy)/(tpy) are synthesized and characterized. Reactions of ruthenium (II) precursors at 80 °C favored heteroleptic complexes formation over the homoleptic side products. Visible light excitation of these complexes resulted in the metal‐to‐ligand charge transfer (MLCT) transitions. The inter‐planar torsional angle between the atoms of donor functionalized phenyl ring and the central pyridine (py) of the tpy core strongly influences visible light absorption and photovoltaic properties. The lower inter‐ring py‐ph torsion in the acceptor end of the MLCT structures and its increase in the oxidized doublets could prevent the back electron transfer. The ruthenium atom and the acceptor functionalized tpy host the triplet‐MLCT spin density. Ambient temperature excited‐state decay followed the energy gap law and occurred in the order of a few nanoseconds. Herein, we evaluate the photosensitizing ability of these complexes via a combined experimental and computational approach.

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Section: Resultsmentioning

confidence: 99%

Ruthenium (II) Complexes Bearing Heteroleptic Terpyridine Ligands: Synthesis, Photophysics and Solar Energy Conversion

et al. 2021

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“…The absorption onset wavelength ( λ onset ) is obtained as 770, 545, and 484 nm for PTB7‐Th, PC 71 BM, and NAI‐FN‐NAI (BO), respectively, by extending the linear part of the UV–vis spectrum as shown in Figure 2a. [ 43,44 ]…”

Section: Resultsmentioning

confidence: 99%

“…The absorption onset wavelength (λ onset ) is obtained as 770, 545, and 484 nm for PTB7-Th, PC 71 BM, and NAI-FN-NAI (BO), respectively, by extending the linear part of the UV-vis spectrum as shown in Figure 2a. [43,44] The absorption spectra of binary and ternary active layer for different blend ratios of the fullerene and NFAs are shown in Figure 2b. The absorption peak of the control device (binary: PTB7-Th:PC 71 BM) is found at 707 nm whereas it is red-shifted to 719 nm with slightly improved absorbance when 20% NF (of PC 71 BM) is added to the ternary active layer.…”

Section: Optical Analysismentioning

confidence: 99%

Non‐Fullerene Acceptor‐Based Nanomorphology Enhancement for Efficient Ternary Organic Solar Cells

Khanam

Srivastava

Trang

et al. 2022

Physica Status Solidi (a)

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Recently, the ternary active‐layer‐based organic solar cells have shown remarkable increment in the power conversion efficiency (PCE) by utilizing the synergistic effect of complementary absorption, band alignment, and nano‐scale morphology enhancement. Non‐fullerene acceptors (NFAs) are an important class of functional materials for the improved performance of ternary organic solar cells due to their role in improvising the light absorption and the morphology of the active layer. Here, the non‐fullerene (NF) molecule, NAI‐FN‐NAI (BO), is used as the third component in the bulk heterojunction of PTB7‐Th: PC71BM to fabricate the ternary organic solar cell. The magical number of the composition, i.e., 20% by weight of the NF in the ternary active layer resulted in the PCE of 8.1% devices, which is almost 35% higher efficiency than PTB7‐Th: PC71BM binary devices having the PCE of 6%. The enhanced efficiency is observed even though the lessened effect of complementary absorption and band alignment factors of the NF. Such an improved efficiency is attributed in ternary devices to the nano‐scale morphology enhancement. It could pave the way to realize the best possible bulk heterojunction blend to attain high PCE close to inorganic counterparts.

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“…[16] They showed similar emission spectra with emission maxima (l em ) at � 490 nm. Estimated from absorption onsets, both of them have an optical band gap of 2.6 eV, [17] suitable for efficiently blocking the electrons photogenerated from perovskite material (Figure S1a, Table S1). The IP of an � 15 nm-thick undoped HTM film spin-coated on indium tin oxide (ITO) substrates was determined using photoelectron yield spectroscopy (PYS) [18] (Figure 4c, Figure S1b, and Table S1).…”

Section: Resultsmentioning

confidence: 99%

Triarylamine/Bithiophene Copolymer with Enhanced Quinoidal Character as Hole‐Transporting Material for Perovskite Solar Cells

et al. 2022

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Polytriarylamine is a popular hole‐transporting materials (HTMs) despite its suboptimal conductivity and significant recombination at the interface in a solar cell setup. Having noted insufficient conjugation among the triarylamine units along the polymer backbone, we inserted a bithiophene unit between two triarylamine units through iron‐catalyzed C−H/C−H coupling of a triarylamine/thiophene monomer so that two units conjugate effectively via four quinoidal rings when the molecule functions as HTM. The obtained triarylamine/bithiophene copolymer (TABT) used as HTM showed a high‐performance in methylammonium lead iodide perovskite (MAPbI3) solar cells. Mesityl substituted TABT forms a uniform film, shows high hole‐carrier mobility, and has an ionization potential (IP=5.40 eV) matching that of MAPbI3. We fabricated a solar cell device with a power conversion efficiency of 21.3 % and an open‐circuit voltage of 1.15 V, which exceeds the performance of devices using reference standard such as poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine (PTAA) and Spiro‐OMeTAD.

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Accurate determination of the onset wavelength (λonset) in optical spectroscopy

Cited by 44 publications

References 25 publications

Ruthenium (II) Complexes Bearing Heteroleptic Terpyridine Ligands: Synthesis, Photophysics and Solar Energy Conversion

Ruthenium (II) Complexes Bearing Heteroleptic Terpyridine Ligands: Synthesis, Photophysics and Solar Energy Conversion

Non‐Fullerene Acceptor‐Based Nanomorphology Enhancement for Efficient Ternary Organic Solar Cells

Triarylamine/Bithiophene Copolymer with Enhanced Quinoidal Character as Hole‐Transporting Material for Perovskite Solar Cells

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