2016
DOI: 10.1021/acs.jpcb.5b10565
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Effects of Crystal Morphology on Singlet Exciton Fission in Diketopyrrolopyrrole Thin Films

Abstract: Singlet exciton fission (SF) is a promising strategy for increasing photovoltaic efficiency, but in order for SF to be useful in solar cells, it should take place in a chromophore that is air-stable, highly absorptive, solution processable, and inexpensive. Unlike many SF chromophores, diketopyrrolopyrrole (DPP) conforms to these criteria, and here we investigate SF in DPP for the first time. SF yields in thin films of DPP derivatives, which are widely used in organic electronics and photovoltaics, are shown t… Show more

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Cited by 140 publications
(266 citation statements)
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References 50 publications
(83 reference statements)
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“…The SF rate depends on the free energy of the process and the electronic coupling matrix elements between the chromophores for the particular states involved in this process23. Several families of molecular building blocks have been identified that fulfil the energetic requirements for efficient SF, including polyacenes456789, diphenylisobenzofurans10, carotenoids1112, rylenes13 and other chromophores14, although the scope of SF molecules still remains rather limited, as discussed in reviews by Smith and Michl23.…”
mentioning
confidence: 99%
“…The SF rate depends on the free energy of the process and the electronic coupling matrix elements between the chromophores for the particular states involved in this process23. Several families of molecular building blocks have been identified that fulfil the energetic requirements for efficient SF, including polyacenes456789, diphenylisobenzofurans10, carotenoids1112, rylenes13 and other chromophores14, although the scope of SF molecules still remains rather limited, as discussed in reviews by Smith and Michl23.…”
mentioning
confidence: 99%
“…[3] Although the mechanism of SF is not yet fully understood and is still the subject of intense research, it is generally accepted that the single excitation converts to a triplet pair state ( 1 TT), either coherently or incoherently, which later separates into two independent triplets (2 × T 1 ). [6] For SF the energy of the singlet state (E(S 1 )) should be greater than or equal to twice the energy of the triplet state (E(T 1 )), i.e., E(S 1 ) ≥ 2E(T 1 ). [4] The design of a chromophore capable of supporting SF requires optimization of both energetics and intermolecular electronic coupling, so there are only a limited number of reported SF systems.…”
mentioning
confidence: 99%
“…In this study, we investigate the use of hexa-peri-hexabenzocoronene (HBC) as a self-organizing core to promote singlet fission in amorphous films. [6] These properties make DPP derivatives good candidates for OPVs. Soluble HBC derivatives show strong self-association in solution and discotic columnar structures with ordered morphology in films.…”
mentioning
confidence: 99%
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“…Several singlet fission materials have been reported, such as 1,3-diphenylisobenzofuran, 3,4 zeaxanthin, 5 diketopyrrolopyrrole, 6,7 poly(3-dodecylthienylenevinylene), 8 and donor/ acceptor-type polymers with thiophene-1,1-dioxide repeat units. 9 However, as long as the singlet fission materials are limited to the materials used in actual OPV devices, only polycyclic aromatic compounds based on tetracene, pentacene, hexacene, or perylene structure have been reported, 2,1012 except our recent report on oligothienoquinoid compounds.…”
mentioning
confidence: 99%