Efficient photovoltaic energy conversion in tetracene-C60 based heterojunctions

Chu, Chih‐Wei; Shao, Yan; Shrotriya, Vishal; Yang, Yang

doi:10.1063/1.1946184

Cited by 133 publications

(109 citation statements)

References 13 publications

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“…polyacenes, [83][84][85] such as pentacene and tetracene, as well as the metal phthalocyanines (MePc), such as CuPc or ZnPc, are among the most studied donor materials. For acceptors, perylene compounds like 3,4,9,10-perylenetetracarboxylic bis-benzimidazole (PTCBI), as well as C 60 , are commonly used.…”

Section: Methodsmentioning

confidence: 99%

Solar cells utilizing small molecular weight organic semiconductors

Rand

Genoe

Heremans

et al. 2007

Progress in Photovoltaics

467

296

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In this review, we focus on the field of organic photovoltaic cells based on small molecular weight materials. In particular, we discuss the physical processes that lead to photocurrent generation in organic solar cells, as well as the various architectures employed to optimize device performance. These include the donor-acceptor heterojunction for efficient exciton dissociation, the exciton blocking layer, the mixed or bulk heterojunction, and the stacked or tandem cell. We show how the choice of materials with known energy levels and absorption spectra affect device performance, particularly the open-circuit voltage and short-circuit current density. We also discuss the typical materials and growth techniques used to fabricate devices, as well as the issue of device stability, all of which are critical for the commercialization of low-cost and high-performance organic solar cells.

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Section: Methodsmentioning

confidence: 99%

Solar cells utilizing small molecular weight organic semiconductors

Rand

Genoe

Heremans

et al. 2007

Progress in Photovoltaics

467

296

View full text Add to dashboard Cite

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“…8,9 In order to understand the fundamental electronic properties and their dynamics upon photo-excitation steady state absorption, [10][11][12] emission, 10,[13][14][15][16] photoemission, 17 and transient absorption [18][19][20][21][22][23][24][25] spectroscopy studies on both Tc crystals and Tc polycrystalline thin films have been used.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast dynamics of excitons in tetracene single crystals

Birech

Schwoerer

Schmeiler

et al. 2014

The Journal of Chemical Physics

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Articles you may be interested inUltrafast exciton dynamics in free standing 200 nm thin tetracene single crystals were studied at room temperature by femtosecond transient absorption spectroscopy in the visible spectral range. The complex spectrally overlapping transient absorption traces of single crystals were systematically deconvoluted. From this, the ultrafast dynamics of the ground, excited, and transition states were identified including singlet exciton fission into two triplet excitons. Fission is generated through both, direct fission of higher singlet states S n on a sub-picosecond timescale, and thermally activated fission of the singlet exciton S 1 on a 40 ps timescale. The high energy Davydov component of the S 1 exciton is proposed to undergo fission on a sub-picoseconds timescale. At high density of triplet excitons their mutual annihilation (triplet-triplet annihilation) occurs on a <10 ps timescale.

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“…Many of the derivatives of 4 and 5 are good candidates for OLEDs (19)(20)(21)(22). Recently, with a growing interest in solar energy and solar cells, 4 and 5 have also been made into OPV devices (23)(24)(25)(26)(27). Furthermore, 3-5 have been shown to be able to undergo singlet fission (28)(29)(30)(31)(32)(33) ( 1 M* + 1 M → 2 3 M*), which in principle can raise the efficiency limit of a solar cell to more than 40% (34,35) by converting one high-energy singlet exciton to two spatially separated lower-energy triplet excitons.…”

mentioning

confidence: 99%

Nature of ground and electronic excited states of higher acenes

Yang

Davidson

Yang

2016

Proc. Natl. Acad. Sci. U.S.A.

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174

208

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Higher acenes have drawn much attention as promising organic semiconductors with versatile electronic properties. However, the nature of their ground state and electronic excited states is still not fully clear. Their unusual chemical reactivity and instability are the main obstacles for experimental studies, and the potentially prominent diradical character, which might require a multireference description in such large systems, hinders theoretical investigations. Here, we provide a detailed answer with the particleparticle random-phase approximation calculation. The 1 A g ground states of acenes up to decacene are on the closed-shell side of the diradical continuum, whereas the ground state of undecacene and dodecacene tilts more to the open-shell side with a growing polyradical character. The ground state of all acenes has covalent nature with respect to both short and long axes. The lowest triplet state 3 B 2u is always above the singlet ground state even though the energy gap could be vanishingly small in the polyacene limit. The bright singlet excited state 1 B 2u is a zwitterionic state to the short axis. The excited 1 A g state gradually switches from a doubleexcitation state to another zwitterionic state to the short axis, but always keeps its covalent nature to the long axis. An energy crossing between the 1 B 2u and excited 1 A g states happens between hexacene and heptacene. Further energetic consideration suggests that higher acenes are likely to undergo singlet fission with a low photovoltaic efficiency; however, the efficiency might be improved if a singlet fission into multiple triplets could be achieved.higher acenes | diradical | double excitation | particle-particle random-phase approximation | charge-transfer excitation

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Efficient photovoltaic energy conversion in tetracene-C60 based heterojunctions

Cited by 133 publications

References 13 publications

Solar cells utilizing small molecular weight organic semiconductors

Solar cells utilizing small molecular weight organic semiconductors

Ultrafast dynamics of excitons in tetracene single crystals

Nature of ground and electronic excited states of higher acenes

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