Effect of Thiophene Spacer Position in Carbazole‐Based Dye‐Sensitized Solar Cells on Photophysical, Electrochemical and Photovoltaic Properties

Samae, Ruslan; Surawatanawong, Panida; Eiamprasert, Utt; Pramjit, Songyos; Saengdee, Laksana; Tangboriboonrat, Pramuan; Kiatisevi, Supavadee

doi:10.1002/ejoc.201600353

Cited by 16 publications

(4 citation statements)

References 72 publications

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“…Carbazole-based homoleptic or heteroleptic iridium(III) complexes were also reported in the construction of different OLEDs [10][11][12][13]. In OPVs, carbazole derivatives are frequently used as small molecule p-type (electron-donating) materials or electron-accepting (n-type) materials with a variety of donor-acceptor combinations [14,15]. In sensor studies, carbazole derivatives are used as fluorophores.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of novel multifunctional carbazole-based molecules and their thermal, electrochemical and optical properties

Altınölçek

Battal

Tavaslı

et al. 2020

Beilstein J. Org. Chem.

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Two novel carbazole-based compounds 7a and 7b were synthesised as potential candidates for application in organic electronics. The materials were fully characterised by NMR spectroscopy, mass spectrometry, FTIR, thermogravimetric analysis, differential scanning calorimetry, cyclic voltammetry, and absorption and emission spectroscopy. Compounds 7a and 7b, both of which were amorphous solids, were stable up to 291 °C and 307 °C, respectively. Compounds 7a and 7b show three distinctive absorption bands: high and mid energy bands due to locally excited (LE) transitions and low energy bands due to intramolecular charge transfer (ICT) transitions. In dichloromethane solutions compounds 7a and 7b gave emission maxima at 561 nm and 482 nm with quantum efficiencies of 5.4% and 97.4% ± 10%, respectively. At positive potential, compounds 7a and 7b gave two different oxidation peaks, respectively: quasi-reversible at 0.55 V and 0.71 V, and reversible at 0.84 V and 0.99 V. At negative potentials, compounds 7a and 7b only exhibited an irreversible reduction peak at −1.86 V and −1.93 V, respectively.

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Section: Introductionmentioning

confidence: 99%

Synthesis of novel multifunctional carbazole-based molecules and their thermal, electrochemical and optical properties

Altınölçek

Battal

Tavaslı

et al. 2020

Beilstein J. Org. Chem.

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“…Table S14: Cartesian coordinates of O7. References [52][53][54][55][56][57][58][59][60][61][62][63] are cited in the supplementary materials.…”

Section: Supplementary Materialsmentioning

confidence: 99%

A Theoretical Evaluation of the Efficiencies of Metal-Free 1,3,4-Oxadiazole Dye-Sensitized Solar Cells: Insights from Electron–Hole Separation Distance Analysis

2022

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Herein, some novel metal-free 1,3,4-oxadiazole compounds O1–O7 were evaluated for their photovoltaic properties using density functional theory (DFT) and time-dependent density functional theory (TD-DFT) calculations to determine if they can serve as metal-free organic dyes in the use of dye-sensitized solar cells (DSSCs). To understand the trends in the relative efficiencies of the investigated compounds as dyes in DSSCs, their electron contributions, hole contributions, and electron–hole overlaps for each respective atom and fragment within the molecule were analyzed with a particular focus on the electron densities on the anchoring segments. As transition density matrices (TDM) provide details about the departure of each electron from its corresponding hole during excitations, which results in charge transfer (CT), the charge separation distance (Δr) between the electron and its corresponding hole was studied, in addition to the degree of electron–hole overlap (Λ). The latter, single-point excitation energy of each electron, the percentage electron contribution to the anchoring segments of each compound, the incident-photon-conversion-efficiency (IPCE), charge recombination, light harvesting efficiency (LHE), electron injection (Φinj), and charge collection efficiency (ncollect) were then compared to Δr to determine whether the expected relationships hold. Moreover, parameters such as diffusion constant (Dπ) and electron lifetime (t), amongst others, were also used to describe electron excitation processes. Since IPCE is the key parameter in determining the efficiency, O3 was found to be the best dye due to its highest value.

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“…Carbazole-based homoleptic or heteroleptic iridium(III) complexes were also reported in the construction of different OLEDs [10][11][12][13]. In OPVs, carbazole derivatives are frequently used as small molecule p-type (electron donating) materials or electron accepting (n-type) materials with a variety of donor-acceptor combinations [14,15]. In sensor studies, carbazole derivatives are used as fluorophores.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of novel multifunctional carbazole based molecules and their thermal, electrochemical and optical properties

Altınölçek¹,

Battal²,

Tavaslı³

et al. 2020

Preprint

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Two novel carbazole-based compounds 7a and 7b were synthesised as potential candidates for application in organic electronics. The materials were fully characterised by NMR spectroscopy, mass spectrometry, FT-IR, thermogravimetric analysis, differential scanning calorimetry, cyclic voltammetry, and absorption and emission spectroscopy. Compounds 7a and 7b, both of which were amorphous solids, were stable up to 291oC and 307oC, respectively. Compounds 7a and 7b show three distinctive absorption bands: high and mid energy bands due to locally excited (LE) transitions and low energy bands due to intramolecular charge transfer (ICT) transitions. In dichloromethane solutions compounds 7a and 7b gave emission maxima at 561 nm and 482 nm with quantum efficiencies of 5.4% and 97.4% ± 10%, respectively. At positive potential, compounds 7a and 7b gave two different oxidation peaks, respectively: quasi-reversible at 0.55 V and 0.71 V, and reversible at 0.84 V and 0.99 V. At negative potentials, compounds 7a and 7b only exhibited an irreversible reduction peak at -1.86 V and -1.93 V, respectively.

show abstract

Effect of Thiophene Spacer Position in Carbazole‐Based Dye‐Sensitized Solar Cells on Photophysical, Electrochemical and Photovoltaic Properties

Cited by 16 publications

References 72 publications

Synthesis of novel multifunctional carbazole-based molecules and their thermal, electrochemical and optical properties

Synthesis of novel multifunctional carbazole-based molecules and their thermal, electrochemical and optical properties

A Theoretical Evaluation of the Efficiencies of Metal-Free 1,3,4-Oxadiazole Dye-Sensitized Solar Cells: Insights from Electron–Hole Separation Distance Analysis

Synthesis of novel multifunctional carbazole based molecules and their thermal, electrochemical and optical properties

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