Solution Processed Inverted Organic Bulk Heterojunction Solar Cells Under Ambient Air-Atmosphere

Arulraj, A.; Bhuvaneshwari, S.; Senguttuvan, G.; Suri, Nikhil

doi:10.1007/s10904-017-0762-y

Cited by 23 publications

(11 citation statements)

References 42 publications

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“…The FTIR spectral characteristics of the pristine films and blends deposited on a glass substrate are shown in Figure 11. At wavenumber positions in the range of 650-1585 cm −1 , two clustered peaks can be observed which are attributed to the occurrence of C-H band symmetric and asymmetric vibrations (Arulraj et al, 2018).…”

Section: Ftir Measurementsmentioning

confidence: 96%

Comparative Investigation of Fullerene PC71BM and Non-fullerene ITIC-Th Acceptors Blended With P3HT or PBDB-T Donor Polymers for PV Applications

et al. 2021

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Fundamentally, organic solar cells (OSCs) with a bulk-heterojunction active layer are made of at least two electronically dissimilar molecules, in which photoabsorption in one (donor) generates Frenkel excitons. The formation of free charge carriers emerge after exciton dissociation at the donor:acceptor interface. In the past decade, most of the progress in enhanced device performance has been steered by the rapid development of novel donor and acceptor materials and on device engineering. Among these donor materials, regioregular poly(3-hexylthiophene) (P3HT) produced better performance despite the mismatch of its absorption coefficient with the solar emission spectrum. Comparatively the donor PBDB-T exhibits an outstanding absorption coefficient with a deeper-lying highest occupied molecular orbital (HOMO) level. Previously most of the efficient acceptors were based on fullerene molecules characterized by limited photoabsorption and stability. In contrast, the recently developed non-fullerene OSCs have a tunable absorption spectrum and exhibit improved stability. In this work, we explore the fundamental sources of the differences in the device performance for different blend compositions made of fullerene derivative (PC71BM) and non-fullerene (ITIC-Th) when paired with the polymer donors P3HT and PBDB-T. The characteristic changes of the optical properties of these blends and their roles in device performance are also investigated. We also studied charge generation where PBDB-T:PC71BM showed the highest maximum exciton generation rate (Gmax) of 3.22 × 1028 s–1 while P3HT: ITIC-Th gave the lowest (0.96 × 1028 s–1). Also noted, PC71BM based counterparts gave better charge transfer capabilities as seen from the lower PL quenching and higher charge carrier dissociation plus collection probability P(E,T) derived from a plot of Jph/Jsat ratio under short-circuit conditions against the effective voltages.

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Section: Ftir Measurementsmentioning

confidence: 96%

Comparative Investigation of Fullerene PC71BM and Non-fullerene ITIC-Th Acceptors Blended With P3HT or PBDB-T Donor Polymers for PV Applications

et al. 2021

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“…The sharp band appears in the region of 1596 cm −1 , 1389 cm −1 and broad band around 3400 cm −1 . The broad band at the region of 3400 cm −1 is due to the presence of adsorbed water molecules 24 , and the other bands observed at 1596, 1389, and 532 cm −1 corresponds to C = S stretching, N-C-N symmetric stretching and N-C-S bending vibrations respectively 25,26 . A peak with relatively weak intensity observed at 665 cm −1 corresponds to the sulphur-sulphur bond in metal sulphides 27 .…”

Section: Resultsmentioning

confidence: 98%

Direct Synthesis of cubic shaped Ag2S on Ni mesh as Binder-free Electrodes for Energy Storage Applications

Arulraj,

Ilayaraja,

Rajeshkumar

et al. 2019

Sci Rep

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A facile approach of chemical bath deposition was proposed to fabricate direct synthesis of silver sulphide (Ag 2 S) on nickel (Ni) mesh without involvement for binders for supercapacitor electrodes. The phase purity, structure, composition, morphology, microstructure of the as-fabricated Ag 2 S electrode was validated from its corresponding comprehensive characterization tools. The electrochemical characteristics of the Ag 2 S electrodes were evaluated by recording the electrochemical measurements such as cyclic voltammetry and charge/discharge profile in a three electrode configuration system. Ag 2 S employed as working electrode demonstrates notable faradaic behaviour including high reversible specific capacitance value of 179 C/g at a constant charge/discharge current density of 1 A/g with high cyclic stability which is relatively good as compared with other sulphide based materials. The experimental results ensure fabricated binder-free Ag 2 S electrodes exhibits better electrochemical performance and suitable for potential electrodes in electrochemical energy storage applications.

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“…However, the specific interaction between fluorine atoms and thiol groups is just based on the assumption without direct evidence. Then, the FTIR technique was performed to investigate the absorption behavior of polymer in chlorobenzene solution with BT additive.…”

Section: Resultsmentioning

confidence: 99%

Specific interaction between fluorine atoms and thiol groups accounting for higher domain purity and photostability in narrowband BHJ systems

Zhou

Zhang

et al. 2019

J Polym Sci B Polym Phys

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In order to explore the role of fluorine atoms on photostability as well as morphology control of active layer in the presence of 1,4‐butanedithiol (BT), the four polymers with or without fluorine atoms in the backbones including polythieno[3,4‐b]thiophene/benzodithiophene, poly[(4,8‐bis‐(2‐ethylhexyloxy)‐benzo(1,2‐b:4,5‐b9)dithiophene)‐2,6‐diyl‐alt‐(4‐(2‐ethylhexanoyl)‐thieno[3,4‐b]thiophene‐)‐2‐6‐diyl)], poly[4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b;4,5‐b′]dithiophene‐2,6‐diyl‐alt‐(4‐(2‐ethylhexyl)‐3‐fluorothieno[3,4‐b]thiophene‐)‐2‐carboxylate‐2‐6‐diyl)], and poly[4,8‐bis‐(2‐ethyl‐hexyl‐thiophene‐5‐yl)‐benzo[1,2‐b:4,5‐b0]dithiophene‐2,6‐diyl]‐alt‐[2‐(20‐ethyl‐hexanoyl)‐thieno [3,4‐b]thiophen‐4,6‐diyl] were selected for comparison. It is found that the specimens containing fluorine atoms in polymer backbones showed of higher stability after illumination for 1 h in the presence of BT additive, contributing to the higher domain purity. The specific interaction between fluorine atoms and thiol groups was demonstrated by the appearance of novel absorption peak at 2663.1 cm−1, in addition to the broadening of peak at 2556.2 cm−1 ascribing to SH stretching vibration as confirmed by Fourier transform infrared (FTIR) spectroscopy. The finding may guide the accurate use of thiols as effective solvent additive in morphology and stability optimization. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 941–951

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Solution Processed Inverted Organic Bulk Heterojunction Solar Cells Under Ambient Air-Atmosphere

Cited by 23 publications

References 42 publications

Comparative Investigation of Fullerene PC71BM and Non-fullerene ITIC-Th Acceptors Blended With P3HT or PBDB-T Donor Polymers for PV Applications

Comparative Investigation of Fullerene PC71BM and Non-fullerene ITIC-Th Acceptors Blended With P3HT or PBDB-T Donor Polymers for PV Applications

Direct Synthesis of cubic shaped Ag2S on Ni mesh as Binder-free Electrodes for Energy Storage Applications

Specific interaction between fluorine atoms and thiol groups accounting for higher domain purity and photostability in narrowband BHJ systems

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