Dynamics of molecular excitons near a semiconductor surface studied by fluorescence quenching of polycrystalline tetracene on silicon

Piland, Geoffrey B.; Burdett, Jonathan J.; Hung, T.; Chen, Po-Hsun; Lin, Chi‐Feng; Chiu, Tien‐Lung; Lee, Jiun-Haw; Bardeen, Christopher J.

doi:10.1016/j.cplett.2014.03.075

Cited by 35 publications

(43 citation statements)

References 36 publications

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“…Although these studies were for inorganic quantum dots, efforts are underway to see if the same effect can be achieved with bulk inorganic semiconductors. One study found no evidence for energy transfer from tetracene to Si 71 , but further work is needed to fully explore triplet energy transfer to bulk inorganic semiconductors and numerous challenges related to device architectures, interfaces and surface treatments will need to be overcome.…”

Section: C) Hybrid Organic/quantum Dot Devicesmentioning

confidence: 99%

Harnessing singlet exciton fission to break the Shockley–Queisser limit

2017

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Singlet exciton fission is a carrier multiplication process in organic semiconductors, which allows for the generation of two electron-hole pairs for each photon absorbed. First discovered in the late 1960s, the area has witnessed an explosion of interest within the last 5 years, with demonstrations that singlet fission can occur on sub 100fs timescales, with 200% yield and can be used to build photovoltaics with external quantum efficiencies above 100% percent. The grand challenge of the field is to use singlet fission to enhance the efficiency of conventional inorganic solar cells, such as silicon, and break the Shockley-Queisser limit on the efficiency of single junction photovoltaics. Achieving this goal will require a greatly broadened effort than at present, with collaboration between synthetic chemistry, spectroscopy, theory, material science, organic and inorganic semiconductor device physics and engineering. This review critically assesses the current state of the field, highlighting the key results and identifying the crucial challenges ahead. In doing so, we seek to open the area to new expertise and ideas, which will in turn further both fundamental science and device applications.

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Section: C) Hybrid Organic/quantum Dot Devicesmentioning

confidence: 99%

Harnessing singlet exciton fission to break the Shockley–Queisser limit

2017

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“…By contrast, the bleach at 530–545 nm persists, due to ground state depletion by triplets with a lifetime as long as ∼100 ns. 39 , 40 …”

Section: Tetracenementioning

confidence: 99%

Generating Triplets in Organic Semiconductor Tetracene upon Photoexcitation of Transition Metal Dichalcogenide ReS₂

Maiti

Poonia

Schiettecatte

et al. 2021

J. Phys. Chem. Lett.

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We studied the dynamics of transfer of photoexcited electronic states in a bilayer of the two-dimensional transition metal dichalcogenide ReS 2 and tetracene, with the aim to produce triplets in the latter. This material combination was used as the band gap of ReS 2 (1.5 eV) is slightly larger than the triplet energy of tetracene (1.25 eV). Using time-resolved optical absorption spectroscopy, transfer of photoexcited states from ReS 2 to triplet states in tetracene was found to occur within 5 ps with an efficiency near 38%. This result opens up new possibilities for heterostructure design of two-dimensional materials with suitable organics to produce long-lived triplets. Triplets are of interest as sensitizers in a wide variety of applications including optoelectronics, photovoltaics, photocatalysis, and photon upconversion.

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“…Utilizing a HF etch to remove the blocking layer and enabling direct contact between tetracene and Si (HF-Si/tetracene) does not change this behavior, as seen in Figure 2 c (red curve), which is consistent with earlier reports. 29 The photocurrent still follows the singlet exciton population, and no evidence for triplet transfer is observed.…”

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confidence: 97%

“…Piland et al did not find any evidence of triplet transfer from tetracene into Si upon direct deposition and with a LiF spacer. 29 MacQueen et al reported a small contribution of triplets to the photocurrent upon direct deposition of tetracene on a Si solar cell. 26 The reasons for inefficient triplet transfer could be related to insufficient passivation of the Si surface and the weak coupling between the triplet exciton molecular orbitals and the electronic states in Si.…”

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confidence: 99%

“…The singlet fission time was determined to be 220 ± 1 ps, which is in good agreement with reported values of ∼75–200 ps, depending on the crystallinity, grain size, and preparation conditions. 29 , 31 , 36 , 39 , 41 , 42 The faster decay of the delayed PL can be reproduced with the kinetic model by incorporating an additional triplet transfer process to Si without changing the other rate constants. The model based on these kinetic equations reproduces the data for prompt (until 1.7 ns) and delayed PL (>30 ns) well, but fails to describe the decay at intermediate times between prompt and delayed PL.…”

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confidence: 99%

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Change in Tetracene Polymorphism Facilitates Triplet Transfer in Singlet Fission-Sensitized Silicon Solar Cells

Daiber

Maiti

Ferro

et al. 2020

J. Phys. Chem. Lett.

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Singlet fission in tetracene generates two triplet excitons per absorbed photon. If these triplet excitons can be effectively transferred into silicon (Si), then additional photocurrent can be generated from photons above the bandgap of Si. This could alleviate the thermalization loss and increase the efficiency of conventional Si solar cells. Here, we show that a change in the polymorphism of tetracene deposited on Si due to air exposure facilitates triplet transfer from tetracene into Si. Magnetic field-dependent photocurrent measurements confirm that triplet excitons contribute to the photocurrent. The decay of tetracene delayed photoluminescence was used to determine a transfer efficiency of ∼36% into Si. Our study suggests that control over the morphology of tetracene during the deposition will be of great importance to boost the triplet transfer yield further.

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Dynamics of molecular excitons near a semiconductor surface studied by fluorescence quenching of polycrystalline tetracene on silicon

Cited by 35 publications

References 36 publications

Harnessing singlet exciton fission to break the Shockley–Queisser limit

Harnessing singlet exciton fission to break the Shockley–Queisser limit

Generating Triplets in Organic Semiconductor Tetracene upon Photoexcitation of Transition Metal Dichalcogenide ReS₂

Change in Tetracene Polymorphism Facilitates Triplet Transfer in Singlet Fission-Sensitized Silicon Solar Cells

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Dynamics of molecular excitons near a semiconductor surface studied by fluorescence quenching of polycrystalline tetracene on silicon

Cited by 35 publications

References 36 publications

Harnessing singlet exciton fission to break the Shockley–Queisser limit

Harnessing singlet exciton fission to break the Shockley–Queisser limit

Generating Triplets in Organic Semiconductor Tetracene upon Photoexcitation of Transition Metal Dichalcogenide ReS2

Change in Tetracene Polymorphism Facilitates Triplet Transfer in Singlet Fission-Sensitized Silicon Solar Cells

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Generating Triplets in Organic Semiconductor Tetracene upon Photoexcitation of Transition Metal Dichalcogenide ReS₂