Correlating Structure and Function in Organic Electronics: From Single Molecule Transport to Singlet Fission

Low, Jonathan Z.; Sanders, Samuel N.; Campos, Luis M.

doi:10.1021/cm502366x

Cited by 52 publications

(53 citation statements)

References 122 publications

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“…An alternative approach to ensure SF efficiency is not lost with unfavorable morphology is to employ an iSF material, in which case SF does not depend sensitively on intermolecular packing but instead is an innate property of the molecule. While the utility of such an approach was recognized and candidate structures were theorized and synthesized, it was not until 2015 that efficient systems were reported . These early efforts towards iSF materials, both theoretical and experimental, have been reviewed elsewhere .…”

Section: Recent Progress In Intramolecular Singlet Fissionmentioning

confidence: 99%

Singlet Fission: Progress and Prospects in Solar Cells

et al. 2016

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The third generation of photovoltaic technology aims to reduce the fabrication cost and improve the power conversion efficiency (PCE) of solar cells. Singlet fission (SF), an efficient multiple exciton generation (MEG) process in organic semiconductors, is one promising way to surpass the Shockley-Queisser limit of conventional single-junction solar cells. Traditionally, this MEG process has been observed as an intermolecular process in organic materials. The implementation of intermolecular SF in photovoltaic devices has achieved an external quantum efficiency of over 100% and demonstrated significant promise for boosting the PCE of third generation solar cells. More recently, efficient intramolecular SF has been reported. Intramolecular SF materials are modular and have the potential to overcome certain design constraints that intermolecular SF materials possess, which may allow for more facile integration into devices.

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Section: Recent Progress In Intramolecular Singlet Fissionmentioning

confidence: 99%

Singlet Fission: Progress and Prospects in Solar Cells

et al. 2016

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“…Many of these syntheses rely on metal-catalyzed cross-coupling protocols such as the Suzuki and Sonogashira reactions, althoughi nnovatives ynthe-ses based on, for example, Diels-Alder cycloadditions [53] have recently appeared. Beyond pentacene, av ariety of other carbon-rich oligomeric chromophores have been explored for iSF and contribute to unraveling the underlying mechanism, these reports are outside the scope of this Minireview,a nd for current examples, see references [54][55][56][57][58][59][60][61][62][63][64][65][66][67].…”

Section: Introductionmentioning

confidence: 99%

Pentacene Dimers as a Critical Tool for the Investigation of Intramolecular Singlet Fission

Hetzer

Guldi

Tykwinski

2018

Chemistry A European J

132

176

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Singlet fission (SF) involves the spontaneous splitting of a photoexcited singlet state into a pair of triplets, and it holds great promise toward the realization of more efficient solar cells. Although the process of SF has been known since the 1960s, debate regarding the underlying mechanism continues to this day, especially for molecular materials. A number of different chromophores have been synthesized and studied in order to better understand the process of SF. These previous reports have established that pentacene and its derivatives are especially well-suited for the study of SF, since the energetic requirement E(S )≥2E(T ) is fulfilled rendering the process exothermic and unidirectional. Dimeric pentacene derivatives, in which individual pentacene chromophores are tethered by a "spacer", have emerged as the system of choice toward exploring the mechanism of intramolecular singlet fission (iSF). The dimeric structure, and in particular the spacer, allows for controlling and tuning the distance, geometric relationship, and electronic coupling between the two pentacene moieties. This Minireview describes recent advances using pentacene dimers for the investigation of iSF.

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“…4,5 Furthermore, the study of iSF chromophores in solution can reveal valuable information for understanding and optimizing the SF process through structure-property relationships. 4,[6][7][8][9][10][11][12][13] Recent breakthroughs in material design and mechanistic understanding of SF have come from molecular dimers of pentacene, 6,7,9,[11][12][13] in addition to heterodimers of oligoacenes. 8,14 One important finding is that triplet pairs generated in pentacene dimers exhibit spin correlations that persist for >10 ns.…”

Section: Introductionmentioning

confidence: 99%

Singlet Fission in Polypentacene

Sanders

Kumarasamy

Pun

et al. 2016

Chem

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Singlet fission (SF), the conversion of a singlet exciton into two triplet excitons, has the potential to enhance single-junction photovoltaic efficiencies. Many groups have recently reported SF in molecular dimers. Here, Campos and colleagues report SF in a pentacene polymer. They also examine a series of well-defined oligomers to understand the changes in photophysics moving from the constrained dimer system to the extended pentacene polymer.

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Correlating Structure and Function in Organic Electronics: From Single Molecule Transport to Singlet Fission

Cited by 52 publications

References 122 publications

Singlet Fission: Progress and Prospects in Solar Cells

Singlet Fission: Progress and Prospects in Solar Cells

Pentacene Dimers as a Critical Tool for the Investigation of Intramolecular Singlet Fission

Singlet Fission in Polypentacene

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