Enhanced external quantum efficiency in an organic photovoltaic cell via singlet fission exciton sensitizer

Reusswig, Philip D.; Congreve, Daniel N.; Thompson, Nicholas J.; Baldo, Marc A.

doi:10.1063/1.4752445

Cited by 101 publications

(91 citation statements)

References 16 publications

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“…A thin layer of poly(3-hexylthiophene) (P3HT) was used in those cells at the hole-collecting indium-tin oxide (ITO) electrode, considerably increasing the photocurrent from pentacene over devices made with ITO alone. We have investigated these device structures and find that the P3HT layer can act as an effective antenna similar to work by Reusswig et al, 11 transferring singlet excitons to the pentacene layer with 30% efficiency, and we establish the triplet exciton diffusion range in the pentacene film, noting that previous estimations of the exciton diffusion length in pentacene did not take singlet exciton fission into account. 12,13 The structure of the pentacene/C 60 donor-acceptor bilayer solar cells studied here is illustrated in Figure 1(a).…”

mentioning

confidence: 93%

“…Our fit revealed that excitons are injected from P3HT into pentacene with an absorption-to-injection efficiency of 30 6 10%. Therefore, a thin pentacene layer could be used as a fission sensitizer 11 to split excitons from another highly absorbing material, decoupling absorption from fission. Internal quantum efficiencies approaching 200% for thin pentacene layers make pentacene a promising candidate for efficient singlet fission sensitized solar cells.…”

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confidence: 99%

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Triplet diffusion in singlet exciton fission sensitized pentacene solar cells

Tabachnyk¹,

Ehrler²,

Bayliss³

et al. 2013

Applied Physics Letters

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Singlet fission sensitized photovoltaics have the potential to surpass the Shockley-Queisser limit for a single-junction structure. We investigate the dynamics of triplet excitons resulting from singlet fission in pentacene and their ionization at a C60 heterojunction. We model the generation and diffusion of excitons to predict the spectral response. We find the triplet diffusion length in polycrystalline pentacene to be 40 nm. Poly(3-hexylthiophene) between the electrode and pentacene works both to confine triplet excitons and also to transfer photogenerated singlet excitons into pentacene with 30% efficiency. The lower bound for the singlet fission quantum efficiency in pentacene is 180 ± 15%.

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confidence: 93%

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confidence: 99%

Triplet diffusion in singlet exciton fission sensitized pentacene solar cells

Tabachnyk¹,

Ehrler²,

Bayliss³

et al. 2013

Applied Physics Letters

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“…A strong external magnetic field increases the number of singlet excitons and reduces the yield of independent triplet excitons. The effect can be very large: up to 20% modulations in the fluorescence from singlet excitons are observed in acenes such as tetracene and rubrene [10].…”

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confidence: 99%

“…In thin films, fission has been previously characterized by transient [8,15] and continuous wave [10] optical probes. Both show a strong magnetic field dependence in the fluorescence.…”

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confidence: 99%

Magnetic field dependence of singlet fission in solutions of diphenyl tetracene

Thompson

Hontz

Chang

et al. 2015

Phil. Trans. R. Soc. A.

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Magnetic field effects provide a convenient and specific probe of singlet exciton fission within optoelectronic devices. Here, we demonstrate that this tool may also be applied to screen potential fission material candidates in solution. We characterize the phenomenon in diphenyl tetracene (DPT), which shows strong fluorescence modulation and the expected field dependence in its transient decay as a function of concentration. Solution measurements may also be used to test for the presence of an intermediate charge transfer state, but we observe no changes to the field dependence of DPT singlet exciton fission in toluene relative to chloroform.

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“…Indeed, several groups have reported layered organic PVs composed of two donor layers [13][14][15][16][17][18][19]. Although different mechanisms, such as double exciton dissociation at the heterojunction of a centered ambipolar donor layer with both the acceptor layer and the other donor layer, have been proposed [13,14,18], an interlayer ET sensitization mechanism has been accepted [15,16,19] [20].…”

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confidence: 99%

Cascade-type excitation energy relay in organic thin-film solar cells

Ichikawa¹,

Takekawa²,

Jeon³

et al. 2013

Organic Electronics

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We investigated small-molecule-based organic photovoltaic (PV) cells with three different electron-donating material layers, two thiophene/phenylene co-oligomers [-bis(biphenyl-4-yl)terthiophene (BP3T) and -diphenyl sexithiophene (P6T)] and copper phthalocyanine (CuPc), and one electron-accepting material layer (C 60 ). A cascade-type energy relay between the three donor layers occurred, and the incident photon-current conversion efficiency improved in the blue light region, where CuPc has very low optical absorption. An increase in P6T photoluminescence intensity in a 2 two-layer sample (BP3T/P6T) on quartz confirmed interlayer excitation transfer (ET) from BP3T and P6T. The bulk heterojunction architecture in our interlayer-ET-based organic PV cell was effective. Moreover, P6T appeared to have a relatively long exciton diffusion length of several tens of nanometers.

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Enhanced external quantum efficiency in an organic photovoltaic cell via singlet fission exciton sensitizer

Cited by 101 publications

References 16 publications

Triplet diffusion in singlet exciton fission sensitized pentacene solar cells

Triplet diffusion in singlet exciton fission sensitized pentacene solar cells

Magnetic field dependence of singlet fission in solutions of diphenyl tetracene

Cascade-type excitation energy relay in organic thin-film solar cells

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