Boron Subphthalocyanine Chloride as an Electron Acceptor for High‐Voltage Fullerene‐Free Organic Photovoltaics

Beaumont, Nicola L.; Cho, Sang Wan; Sullivan, Paul; Newby, D.; Smith, Kevin; Jones, T. S.

doi:10.1002/adfm.201101782

Cited by 92 publications

(74 citation statements)

References 32 publications

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“…The most common alternative acceptors that have been utilized include perylene derivatives [ 2 ] as well as (halogenated) subphthalocyanines. [3][4][5] In the optimal case, an alternative acceptor allows for a more effi cient absorption of solar light compared to fullerenes, or a higher V oc through more optimal energy level alignment. This is because the V oc of organic solar cells scales with the interface gap energy I G , being the difference between the highest occupied molecular orbital (HOMO) energy of the donor and the lowest unoccupied molecular orbital (LUMO) energy of the acceptor.…”

Section: Introductionmentioning

confidence: 99%

Decreased Recombination Through the Use of a Non‐Fullerene Acceptor in a 6.4% Efficient Organic Planar Heterojunction Solar Cell

Verreet

Cnops

Cheyns

et al. 2014

Advanced Energy Materials

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An optimization of several aspects of planar heterojunction solar cells based on boron subnaphthalocyanine chloride (SubNc) as a donor material is presented. The use of hexachlorinated boron subphthalocyanine chloride (Cl6SubPc) as an alternative acceptor to C60 allows for the simultaneous increase of the short‐circuit current, fill factor, and open‐circuit voltage compared to cells with fullerene acceptors. This is due to the complementary absorption of Cl6SubPc versus SubNc, reduced recombination at the heterointerface, and improved energetic alignment. Furthermore, insertion of a thin diindeno[1,2,3‐cd:1′,2′,3′‐lm]perylene (DIP) layer at the anode results in a very significant 60% increase in photocurrent owing to reduced exciton quenching at the anode. The simultaneous improvement of all three solar cell parameters results in a power conversion efficiency of 6.4% for a non‐fullerene planar heterojunction cell.

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Section: Introductionmentioning

confidence: 99%

Decreased Recombination Through the Use of a Non‐Fullerene Acceptor in a 6.4% Efficient Organic Planar Heterojunction Solar Cell

Verreet

Cnops

Cheyns

et al. 2014

Advanced Energy Materials

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“…17), which is comparable to the best bilayer SubPc/C 60 cells reported in the literature 19 . Additionally, it has been shown that non-halogenated SubPc, mostly known as a donor material, can act as an electronaccepting material in bilayer OPV cells 20 . Using a tetracene donor layer to supply the required energy level offset at the DA heterojunction, a PCE of 3.1% can be obtained 21 despite the low electron mobility and low electron affinity of SubPc used as acceptor 22 .…”

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confidence: 99%

8.4% efficient fullerene-free organic solar cells exploiting long-range exciton energy transfer

et al. 2014

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In order to increase the power conversion efficiency of organic solar cells, their absorption spectrum should be broadened while maintaining efficient exciton harvesting. This requires the use of multiple complementary absorbers, usually incorporated in tandem cells or in cascaded exciton-dissociating heterojunctions. Here we present a simple three-layer architecture comprising two non-fullerene acceptors and a donor, in which an energy-relay cascade enables an efficient two-step exciton dissociation process. Excitons generated in the remote wide-bandgap acceptor are transferred by long-range Förster energy transfer to the smaller-bandgap acceptor, and subsequently dissociate at the donor interface. The photocurrent originates from all three complementary absorbing materials, resulting in a quantum efficiency above 75% between 400 and 720 nm. With an open-circuit voltage close to 1 V, this leads to a remarkable power conversion efficiency of 8.4%. These results confirm that multilayer cascade structures are a promising alternative to conventional donor-fullerene organic solar cells.

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“…Unfortunately, even with C 70 , the breadth of absorption in OSCs is unsatisfactory compared to silicon, and the substantially increased costs of C 70 make it impractical for manufacturing scale-up. Non-fullerene acceptors have also been investigated, but generally have lower efficiencies [10][11][12][13]. As a consequence, many researchers have shifted their focus toward alternative device structures that allow for more than two primary absorbers, such as the tandem solar cell approach that has granted 11-12% OSCs [14][15][16], and the more recently studied ternary OSC.…”

Section: Introductionmentioning

confidence: 99%

Vacuum deposited ternary mixture organic solar cells

Williams

Aziz

2015

Organic Electronics

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Boron Subphthalocyanine Chloride as an Electron Acceptor for High‐Voltage Fullerene‐Free Organic Photovoltaics

Cited by 92 publications

References 32 publications

Decreased Recombination Through the Use of a Non‐Fullerene Acceptor in a 6.4% Efficient Organic Planar Heterojunction Solar Cell

Decreased Recombination Through the Use of a Non‐Fullerene Acceptor in a 6.4% Efficient Organic Planar Heterojunction Solar Cell

8.4% efficient fullerene-free organic solar cells exploiting long-range exciton energy transfer

Vacuum deposited ternary mixture organic solar cells

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