Photoluminescence Quenching in Carbon Nanotube‐Polymer/Fullerene Films: Carbon Nanotubes as Exciton Dissociation Centres in Organic Photovoltaics

Nismy, N. Aamina; Jayawardena, K. D. G. Imalka; Adikaari, A. A. D. T.; Silva, S. Ravi P.

doi:10.1002/adma.201101549

Cited by 80 publications

(71 citation statements)

References 34 publications

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“…In the field of organic photovoltaics (OPV), carbon nanotubes (CNTs) have been identified as promising candidates for excitonic antennas and concentrators 12 , broadband energy harvesters 13 , additional exciton dissociation sites in triple heterojunctions 14 and as high mobility charge extraction paths. 15 Over the past few years, much effort has been expanded on producing a material system that can act as an efficient hole extraction layer for OPVs as a substitute for…”

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confidence: 99%

Hybrid Carbon Nanotube Networks as Efficient Hole Extraction Layers for Organic Photovoltaics

et al. 2012

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Transparent, highly percolated networks of regio-regular poly(3-hexylthiophene) (rr-P3HT) wrapped semiconducting single walled carbon nanotubes (s-SWNT) are deposited and the charge transfer processes of these nanohybrids are studied using spectroscopic and electrical measurements. The data discloses hole doping of s-SWNTs by the polymer, challenging the prevalent electron doping hypothesis. Through controlled fabrication, high to low-density

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confidence: 99%

Hybrid Carbon Nanotube Networks as Efficient Hole Extraction Layers for Organic Photovoltaics

et al. 2012

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“…However, it is also noted here that the J sc observed for the P3HT:ZnO PVs are lower compared to bulk heterojunction devices with small molecule acceptors. [28] This observation suggests that recombination of dissociated charges is still considerable even under the optimum humidity level.…”

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confidence: 75%

Control of nanocrystal surface defects for efficient charge extraction in polymer-ZnO photovoltaic systems

Han

Adikaari

Jayawardena

et al. 2012

Journal of Applied Physics

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Solution processable photovoltaic devices based on an organic donor (D) and organic/inorganic acceptor (A) offers promise for development of low cost, light weight flexible energy sources. [1][2] The performance of such devices (which have recently exceeded power conversion efficiencies of 7% [3] ) is based on (1) the generation of bound electron-hole pairs (excitons) upon photoexcitation, (2) the dissociation of these excitons generated within the exciton diffusion length from the D-A interface (3) transportation of the free holes and electrons and (4) extraction of these charges at the anode and cathode respectively. While organic semiconductors are commonly used as the donor, [1][2] fullerene derivatives [4][5] , n-type conjugated polymers [6] or inorganic nanostructures [7][8] have been employed as acceptors. The potential advantage in the use of inorganic systems compared to the more widely used organic materials includes a high dielectric constant which facilitates effective exciton dissociation by reducing Coulombic interaction between the electron and the hole in an exciton as well as high carrier mobility. [7] Among the inorganic materials systems widely studied, ZnO with its wide (bulk) band gap of ~3.4 eV, [9] high electron mobility [10] combined with the capability to form nanocrystallites at low temperatures through the use of metallorganic precursors [11] 2 allows it to be incorporated into organic donors that are known only to withstand low temperature annealing processes. [12] Initial investigations on hybrid organic/inorganic photovoltaic systems focused on the addition of quantum dots, nanorods, multipods and nanoparticles into the organic donor. [13] However, difficulty in identification of a suitable solvent for accommodating both the organic and inorganic components as well as the lack of a bicontinous network upon spin casting the hybrid mixture led to poor device efficiencies. [14][15][16] In order to overcome the above technical difficulties, Beek et al [17] proposed the use of diethyl zinc (DEZ), a molecular precursor that is readily soluble in organic media and converts to ZnO upon exposure to moisture at temperatures compatible with organic photovoltaic device fabrication. Since then, the use of DEZ has led to several reports on ZnO incorporated organic-inorganic hybrid photovoltaics. [7,[18][19][20] In addition to the above mentioned advantages, the non-formation of ZnO at room temperature compared to other zinc containing metallorganic precursors [21] as well as the possibility of forming a bicontinous network [7] makes the use of DEZ an attractive route towards forming hybrid organic/inorganic photovoltaic cells. In addition to changing the nature through which the acceptor phase is incorporated, recent investigations have also focused on the use of modified organic donors for inorganic acceptor (Table S1). However as of present, efficiencies comparable to hybrid systems prepared using rr-P3HT and DEZ basedZnO is yet to be achieved.Despite the advantages noted above, as well as the ...

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“…Their long-term dispersion and orientation should be improved, such as thiophene oligomer, pyrene and porphyrin derivatives, polyaniline, and poly (4-vinylpyridine) (PVP) [1,[6][7][8]13]. Single-walled carbon nanotubes (SWCNTs) bonded covalently by naphthalimide resulting in the considerable change in absorption and photoluminescence spectra.…”

Section: Introductionmentioning

confidence: 99%

“…For example, CNTs can be well cut out and modified with functional organic materials which be used for light emitting diodes [3], field effect transistors [4], photovoltaic devices [5], supercapacitors, sensors, solar cells, and displays [6][7][8].As electroninjection conjugate materials, the oxadiazole-based molecules can balance charge injections and increase photo-electron quantum efficiency due to their high electron affinity, thus applying to electronic and optical devices [9,10]. However, these materials easily crystallize and chap so that their fabricated films influence charge injections in devices [11,12].…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence and electronic interaction of multi-walled carbon nanotubes conjugated with oxadiazole materials

Yu¹,

Yang²,

Su³

et al. 2014

Mater Electron Eng

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Fabricating dense film of the oxadiazole-based photoelectron materials is usually limited by its low crystallization, which will influence charge injection in the devices. In this paper, multiwalled carbon nanotubes (MWCNTs) are functionalized by 2-(4-aminophenyl)-5-naphthyl-1,3,4-oxadiazole (APND) to form the MWCNTs-APND conjugate. The formation of MWCNTs-APND dense films may be attributed to attraction between coplanar APND, flexible and linear MWCNTs, and π-stacking between APND and MWCNTs. The APND and MWCNTs-APND were characterized by Fourier transform infrared spectrum, proton nuclear magnetic resonance spectrum, scanning electron microscopy, X-ray diffraction, ultraviolet-visible (UV-Vis) absorption spectrum, and photoluminescence spectrum, and nonlinear electrical measurements. The results indicate UV-Vis absorption of MWCNTs-APND in N, N-dimethylformamide solution is broadened and red-shifted. Its photoluminescence spectrum shows a narrower band than that of APND. The MWCNTs-APND dense films have the same perfect nonlinear electrical properties as those of MWCNTs ones, which is suitable for the potential applications of optoelectronic devices.

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Photoluminescence Quenching in Carbon Nanotube‐Polymer/Fullerene Films: Carbon Nanotubes as Exciton Dissociation Centres in Organic Photovoltaics

Cited by 80 publications

References 34 publications

Hybrid Carbon Nanotube Networks as Efficient Hole Extraction Layers for Organic Photovoltaics

Hybrid Carbon Nanotube Networks as Efficient Hole Extraction Layers for Organic Photovoltaics

Control of nanocrystal surface defects for efficient charge extraction in polymer-ZnO photovoltaic systems

Photoluminescence and electronic interaction of multi-walled carbon nanotubes conjugated with oxadiazole materials

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