Charge Carrier Dynamics in Perovskite Solar Cells

Khan, Mohd Taukeer; Almohammedi, Abdullah; Kazim, Samrana; Ahmad, Shahzada

doi:10.1002/9783527825790.ch12

Cited by 4 publications

(4 citation statements)

References 158 publications

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“…To determine the conductivity (σ) of the thin films, the linear portion of the J–V characteristics was utilized in eq J = σ E = σ V / d which provides conductivity values of 2.3 × 10 –6 and 6.8 × 10 –6 S cm –1 for triad 1 and triad 2 , respectively, in the range of organic semiconductors. The concentration of the free carriers was determined using eq by substituting the obtained values of conductivities and mobilities, n c = σ / e μ and were found to be 1.81 × 10 16 and 1.53 × 10 17 cm –3 for triad 1 and triad 2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Dithienopyrrolobenzothiadiazole and Naphthalimide-Based Donor–Acceptor Triads for Charge Transport and Photocatalytic Synthesis of Benzimidazoles

Tripathi,

Sridevi,

Singh

et al. 2024

ACS Appl. Opt. Mater.

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Herein, acceptor–donor–acceptor π-conjugated small molecules, namely, triad 1 and triad 2, consisting of dithienopyrrolobenzothiadiazole and 1,8-naphthalimide, both with and without a thiophene spacer, were synthesized. Their absorption characteristics, redox properties, charge carrier mobilities, and their potential for metal-free photocatalytic transformations were investigated. Triad 1 and triad 2 showed wide absorption spectra in the range of 300–600 nm in solutions and 350–700 nm in thin films, along with narrow electrochemical bandgaps of 2.05 and 1.83 eV, respectively. Futhermore, the charge carrier mobilities of both triads were assessed through space-charge limited current measurements. The calculated hole mobilities for triad 1 and triad 2 were 1.26 × 10–3 and 8.38 × 10–4 cm2/V s, respectively, while the electron mobilities for triad 1 and triad 2 were 6.73 × 10–4 and 4.18 × 10–4 cm2/V s, respectively. Moreover, triad 1 and triad 2 exhibited efficient photocatalytic behavior toward selective metal-free condensation cyclization reactions of o-phenylenediamine/1,2-diamino-4,5-difluorobenzene and aromatic aldehydes with wide substrate scope under blue LED light to give a variety of pharmaceutically relevant benzimidazole derivatives.

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Section: Resultsmentioning

confidence: 99%

Dithienopyrrolobenzothiadiazole and Naphthalimide-Based Donor–Acceptor Triads for Charge Transport and Photocatalytic Synthesis of Benzimidazoles

Tripathi,

Sridevi,

Singh

et al. 2024

ACS Appl. Opt. Mater.

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“…The high PCE can have different reasons, and in particular charge carrier mobility and electron-hole recombination life time are related to the details in the electronic structure of the materials 34,60 . Charge-carrier dynamics in hybrid perovskite materials has been thoroughly investigated [61][62][63][64] . Our study relates to the spatial overlap in the valence band which is an im-portant electronic parameter for hole transport.…”

Section: Resultsmentioning

confidence: 99%

“…34,60 Charge-carrier dynamics in hybrid perovskite materials has been thoroughly investigated. [61][62][63][64] Our study relates to the spatial overlap in the valence band which is an important electronic parameter for hole transport. The very top of the valence band consists of I 6p states hybridized with lead but with negligible bromide contribution.…”

Section: Resultsmentioning

confidence: 99%

Spatial microheterogeneity in the valence band of mixed halide hybrid perovskite materials

et al. 2022

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“…The decay spectra exhibit two regions: a fast decay at short time and a second, slower, decay at higher time. The decay at shorter lifetime corresponds to radiative decay and the decay at longer time corresponds to non-radiative recombination [46]. The decay spectrum was fitted with a biexponential decay function [9,47]: I(t) = A 0 + A 1 e −t/τ 1 + A 2 e −t/τ 2 , where A 0 is constant, A 1 and A 2 are relative amplitude corresponding to the radiative and nonradiative decay, respectively, and τ 1 and τ 2 are lifetimes corresponding to the radiative and non-radiative recombination process, respectively.…”

Section: Discussionmentioning

confidence: 99%

Preparation of Laterally Chloro-Substituted Schiff Base Ester Liquid Crystals: Mesomorphic and Optical Properties

et al. 2023

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A new class of Schiff base/ester compounds: ICln, 4-((2′-chlorophenylimino)methyl)phenyl-4″-alkoxy benzoates, were synthesized and their mesophase characteristics and thermal behavior were evaluated. Differential scanning calorimetry (DSC) was used to study mesophase transitions, and polarized optical microscopy was carried out to identify the phases (POM). The results show that all compounds are monomorphic, and enantiotropic nematic (N) phases were seen at all side chains. It was found that lateral Cl atoms in the terminal benzene ring influence both conformation and mesomorphic properties. Comparisons between the present investigated lateral Cl derivatives and their laterally neat, as well as their isomeric, compounds have been briefly discussed. Results revealed that the insertion of lateral Cl substituent in the molecular structure impacts the type and stability of the formed mesophases. The exchanges of the ester-connecting moiety improve their thermal nematic stability than their previously prepared structurally isomeric derivatives. These compounds exhibit a broad absorption in the UV-Visible region, including a peak in UV region and a tail around 550 nm, and there were observed to be absorption tail increases and energy band gap decreases with the increase of the alkoxy side chain length. The photoluminescence (PL) intensity was noted to be quenched for the bulky alkoxy group ascribed to non-radiative recombination through the defect states. Moreover, time resolved fluorescence decay spectra reveal that both the radiative and non-radiative recombination lifetime increases with the increase of alkoxy side chain length.

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Charge Carrier Dynamics in Perovskite Solar Cells

Cited by 4 publications

References 158 publications

Dithienopyrrolobenzothiadiazole and Naphthalimide-Based Donor–Acceptor Triads for Charge Transport and Photocatalytic Synthesis of Benzimidazoles

Dithienopyrrolobenzothiadiazole and Naphthalimide-Based Donor–Acceptor Triads for Charge Transport and Photocatalytic Synthesis of Benzimidazoles

Spatial microheterogeneity in the valence band of mixed halide hybrid perovskite materials

Preparation of Laterally Chloro-Substituted Schiff Base Ester Liquid Crystals: Mesomorphic and Optical Properties

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