Significance of Average Domain Purity and Mixed Domains on the Photovoltaic Performance of High-Efficiency Solution-Processed Small-Molecule BHJ Solar Cells

AbstractThe high efficiency all-small-molecule organic solar cells (OSCs) normally require optimized morphology in their bulk heterojunction active layers. Herein, a small-molecule donor is designed and synthesized, and single-crystal structural analyses reveal its explicit molecular planarity and compact intermolecular packing. A promising narrow bandgap small-molecule with absorption edge of more than 930 nm along with our home-designed small molecule is selected as electron acceptors. To the best of our knowledge, the binary all-small-molecule OSCs achieve the highest efficiency of 14.34% by optimizing their hierarchical morphologies, in which the donor or acceptor rich domains with size up to ca. 70 nm, and the donor crystals of tens of nanometers, together with the donor-acceptor blending, are proved coexisting in the hierarchical large domain. All-small-molecule photovoltaic system shows its promising for high performance OSCs, and our study is likely to lead to insights in relations between bulk heterojunction structure and photovoltaic performance.

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Large active layer thickness toleration of high-efficiency small molecule solar cells

Journal of Materials Chemistry A ◽

10.1039/c5ta06627a ◽

2015 ◽

Vol 3 (44) ◽

pp. 22274-22279 ◽

Cited By ~ 13

Author(s):

Qian Zhang ◽

Bin Kan ◽

Xiangjian Wan ◽

Hua Zhang ◽

Feng Liu ◽

...

Keyword(s):

Solar Cells ◽

Layer Thickness ◽

Active Layer ◽

Small Molecule ◽

High Efficiency ◽

Power Conversion ◽

Photovoltaic Performance ◽

Thickness Dependence ◽

Active Layer Thickness ◽

Conversion Efficiencies

The thickness dependence of the photovoltaic performance for devices based on the small molecule DR3TSBDT:PC71BM was systematically investigated and the power conversion efficiencies are found to be relatively insensitive to the thickness.

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Temperature and light dependent diode current in high-efficiency solution-processed small-molecule solar cells

Organic Electronics ◽

10.1016/j.orgel.2014.06.010 ◽

2014 ◽

Vol 15 (9) ◽

pp. 2141-2147 ◽

Cited By ~ 7

Author(s):

V.V. Brus ◽

A.K.K. Kyaw ◽

P.D. Maryanchuk ◽

J. Zhang

Keyword(s):

Solar Cells ◽

Small Molecule ◽

High Efficiency ◽

Solution Processed ◽

Diode Current

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Quantifying interface states and bulk defects in high-efficiency solution-processed small-molecule solar cells by impedance and capacitance characteristics

Progress in Photovoltaics Research and Applications ◽

10.1002/pip.2586 ◽

2015 ◽

Vol 23 (11) ◽

pp. 1526-1535 ◽

Cited By ~ 25

Author(s):

Viktor V. Brus ◽

Aung Ko Ko Kyaw ◽

Pavlo D. Maryanchuk ◽

Jie Zhang

Keyword(s):

Solar Cells ◽

Small Molecule ◽

High Efficiency ◽

Interface States ◽

Solution Processed ◽

Capacitance Characteristics

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Influence of thermal and solvent annealing on the morphology and photovoltaic performance of solution processed, D–A–D type small molecule-based bulk heterojunction solar cells

RSC Advances ◽

10.1039/c5ra16812k ◽

2015 ◽

Vol 5 (113) ◽

pp. 93579-93590 ◽

Cited By ~ 10

Author(s):

C. H. Pavan Kumar ◽

K. Ganesh ◽

T. Suresh ◽

Abhishek Sharma ◽

K. Bhanuprakash ◽

...

Keyword(s):

Solar Cells ◽

Small Molecules ◽

Thermal Annealing ◽

Small Molecule ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

Solution Processed ◽

Solvent Annealing ◽

Heterojunction Solar Cells ◽

Bhj Device

Four new small molecules CSDPP9–CSDPP12 were obtained with appended electron donating units in the molecular terminals of a DPP core. On solvent and thermal annealing, for the CSDPP11:PC71BM blend, the BHJ device displayed a PCE of 5.47%.

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