Bulk heterojunction solar cells based on a low band gap soluble bisazopyrrole and the corresponding BF2-azopyrrole complex

Mikroyannidis, John A.; Kabanakis, A. N.; Tsagkournos, D.V.; Balraju, P.; Sharma, Ganesh D.

doi:10.1039/c0jm00122h

Cited by 17 publications

(12 citation statements)

References 43 publications

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“…Pyrrolyl azo dye 91 showed an optical band gap of 1.54 eV and HOMO and LUMO energy levels of −5.2 and −3.6 eV, respectively. Complexation of 91 with BF 3 ⋅Et 2 O formed BF 2 ‐azopyrrole complex 92 , which showed a broader absorption spectrum and a lower band gap of 1.49 eV compared to 91 143 BF 2 ‐complex 92 was reported to be stable only in nonpolar solvents.…”

Section: Bulk‐heterojunction Solar Cells Made Of Small Molecules Bmentioning

confidence: 96%

Small Molecule Organic Semiconductors on the Move: Promises for Future Solar Energy Technology

2012

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This article is written from an organic chemist's point of view and provides an up-to-date review about organic solar cells based on small molecules or oligomers as absorbers and in detail deals with devices that incorporate planar-heterojunctions (PHJ) and bulk heterojunctions (BHJ) between a donor (p-type semiconductor) and an acceptor (n-type semiconductor) material. The article pays particular attention to the design and development of molecular materials and their performance in corresponding devices. In recent years, a substantial amount of both, academic and industrial research, has been directed towards organic solar cells, in an effort to develop new materials and to improve their tunability, processability, power conversion efficiency, and stability. On the eve of commercialization of organic solar cells, this review provides an overview over efficiencies attained with small molecules/oligomers in OSCs and reflects materials and device concepts developed over the last decade. Approaches to enhancing the efficiency of organic solar cells are analyzed.

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Section: Bulk‐heterojunction Solar Cells Made Of Small Molecules Bmentioning

confidence: 96%

Small Molecule Organic Semiconductors on the Move: Promises for Future Solar Energy Technology

2012

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“…Various structures, from 1D to 3D, have been generated by a-carbonyl-functionalized pyrrole compounds through hydrogen bonds [7][8][9][10][11][12][13]. Over the past decade, azopyrrole dyes have been attracting much attention because of their rapidly increasing role in the design of advanced materials and devices [14][15][16][17][18][19][20][21][22][23]. On the other hand, the self-assembly of azopyrrole through the hydrogen bonds between pyrrole NH and azo nitrogen atom drew our attention.…”

Section: Introductionmentioning

confidence: 99%

Solvents effects on the self-assemblies of 5,5′-bis(3-hydroxyphenyldiazo)-dipyrromethane

Yin

Wang

et al. 2013

Journal of Molecular Structure

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“…18 The work function of PEDOT:PSS is known to be 5.20 eV. 32 Based on the known work functions and band gaps for the other materials used in our QLED devices, the band structures of the QLEDs can be diagrammed as shown in Fig. 3.…”

Section: View Article Onlinementioning

confidence: 99%

Quantum dot light-emitting diodes using a graphene oxide/PEDOT:PSS bilayer as hole injection layer

Song

Shen

et al. 2017

RSC Adv.

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Quantum dot (QD) light-emitting diode (QLED) displays are highly promising optoelectronic devices, but several critical issues remain to be solved. The hole-electron charge balance is particularly important but hole-injection is more difficult than electron-injection in QLEDs; as a result, good hole injection ability is required. Here, we introduce a graphene oxide (GO) layer between the anode electrode and a typical hole injection layer of poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) to improve the hole injection ability of a QLED device. The device with the GO/PEDOT:PSS bilayer hole injection layer exhibits a three-fold increase in brightness and external quantum efficiency as well as doubled current efficiency compared to a counterpart device using a single PEDOT:PSS layer. In addition, the turn-on voltage is improved from 8.35 V to 5.35 V. The dramatic improvements in the optoelectronic performance are attributed to the stepwise energy band structure in the hole injection bilayers; the work function of the GO layer is measured to be 4.98 eV, which reduces the interfacial barrier energy between the anode and PEDOT:PSS layer.

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Bulk heterojunction solar cells based on a low band gap soluble bisazopyrrole and the corresponding BF2-azopyrrole complex

Cited by 17 publications

References 43 publications

Small Molecule Organic Semiconductors on the Move: Promises for Future Solar Energy Technology

Small Molecule Organic Semiconductors on the Move: Promises for Future Solar Energy Technology

Solvents effects on the self-assemblies of 5,5′-bis(3-hydroxyphenyldiazo)-dipyrromethane

Quantum dot light-emitting diodes using a graphene oxide/PEDOT:PSS bilayer as hole injection layer

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