Effects of IPA treatment on the photovoltaic performance of bulk heterojunction organic solar cells

The introduction of the IDIC/ITIC families of non-fullerene acceptors has boosted the photovoltaic performances of bulk-heterojunction organic solar cells. The fine tuning of the photophysical, morphological and processability properties with the aim of reaching higher and higher photocurrent efficiencies has prompted uninterrupted worldwide research on these peculiar families of organic compounds. The main strategies for the modification of IDIC/ITIC compounds, described in several contributions published in the past few years, can be summarized and classified into core modification strategies and end-capping group modification strategies. In this review, we analyze the more recent advances in this field (last two years), and we focus our attention on the molecular design proposed to increase photovoltaic performance with the aim of rationalizing the general properties of these families of non-fullerene acceptors.

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All-small-molecule organic solar cells with over 14% efficiency by optimizing hierarchical morphologies

Nature Communications ◽

10.1038/s41467-019-13292-1 ◽

2019 ◽

Vol 10 (1) ◽

Cited By ~ 73

Author(s):

Ruimin Zhou ◽

Zhaoyan Jiang ◽

Chen Yang ◽

Jianwei Yu ◽

Jirui Feng ◽

...

Keyword(s):

Solar Cells ◽

Small Molecule ◽

Organic Solar Cells ◽

High Performance ◽

High Efficiency ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

Photovoltaic System ◽

Active Layers ◽

Donor Acceptor

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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Combined influence of Urbach’s tail width energy and mobility of charge carriers on the photovoltaic performance of bulk heterojunction organic solar cells

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-019-00868-2 ◽

2019 ◽

Vol 30 (11) ◽

pp. 10064-10072 ◽

Cited By ~ 2

Author(s):

Hooman Mehdizadeh-Rad ◽

Jai Singh

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

Charge Carriers ◽

Mobility Of Charge Carriers

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Enhancing organic photovoltaic performance with 3D-transport dual nonfullerene acceptors

Journal of Materials Chemistry A ◽

10.1039/d1ta09106a ◽

2022 ◽

Author(s):

Shuixing Dai ◽

Mengyang Li ◽

Jingming Xin ◽

Guanyu Lu ◽

Peiyao Xue ◽

...

Keyword(s):

Solar Cells ◽

Charge Transport ◽

Organic Solar Cells ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

Organic Photovoltaic ◽

Sequential Process

We used dual nonfullerene acceptors Y6:FINIC with 3D charge transport features and polymer donor PM6 to fabricate sequential-process heterojunction (SHJ) and bulk heterojunction (BHJ) organic solar cells (OSCs). FINIC has...

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Nanomorphology of Bulk Heterojunction Organic Solar Cells in 2D and 3D Correlated to Photovoltaic Performance

Macromolecules ◽

10.1021/ma802457v ◽

2009 ◽

Vol 42 (13) ◽

pp. 4646-4650 ◽

Cited By ~ 38

Author(s):

Sophie Barrau ◽

Viktor Andersson ◽

Fengling Zhang ◽

Sergej Masich ◽

Johan Bijleveld ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

2D And 3D

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Interface Tuning between Two Connecting Bulk Heterojunctions in Small Molecule Bilayer Ternary Solar Cells

Materials ◽

10.3390/ma13214833 ◽

2020 ◽

Vol 13 (21) ◽

pp. 4833

Author(s):

Qi Jiang ◽

Yingjie Xing

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Interfacial Layer ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

Organic Photovoltaic ◽

Metal Phthalocyanine ◽

Bulk Heterojunctions ◽

Organic Photovoltaic Device ◽

Ternary Bulk Heterojunction

Bilayer ternary solar cells are a kind of novel organic photovoltaic device with a triple-component active layer but are different from the ternary bulk heterojunction (BHJ) blend. Two binary BHJs with a common acceptor (or donor) are deposited sequentially in this kind of device. Here, we study the fabrication and optimization of bilayer ternary solar cells using metal phthalocyanine donors and fullerene acceptor. The device power conversion efficiency (PCE) shows a significant dependence on the interface between the two binary BHJs. The interface formed by stacking two BHJs directly demonstrates severe restrictions on the device efficiency. We find that the photovoltaic performance of bilayer ternary cells can be improved by inserting a C60 molecular monolayer between the two binary BHJs. The effect of the C60 interfacial layer on charge transport is analyzed based on their transport characteristics under negative bias. A relationship between the C60 interfacial layer and recombination under illumination is discussed. This work reveals a particular influence due to the interface facing three materials in organic solar cells.

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Thiophene- and Carbazole-Substituted N-Methyl-Fulleropyrrolidine Acceptors in PffBT4T-2OD Based Solar Cells

Materials ◽

10.3390/ma13061267 ◽

2020 ◽

Vol 13 (6) ◽

pp. 1267 ◽

Cited By ~ 2

Author(s):

Hugo Gaspar ◽

Flávio Figueira ◽

Karol Strutyński ◽

Manuel Melle-Franco ◽

Dzmitry Ivanou ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

Systematic Investigation ◽

Force Microscopy ◽

Energetic Disorder ◽

Lowest Unoccupied Molecular Orbital ◽

Device Properties ◽

The Impact

The impact of fullerene side chain functionalization with thiophene and carbazole groups on the device properties of bulk-heterojunction polymer:fullerene solar cells is discussed through a systematic investigation of material blends consisting of the conjugated polymer poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3‴-di(2-octyldodecyl)-2,2′;5′,2″;5″,2‴-quaterthiophen-5,5‴-diyl)] (PffBT4T-2OD) as donor and C60 or C70 fulleropyrrolidines as acceptors. The photovoltaic performance clearly depended on the molecular structure of the fulleropyrrolidine substituents although no direct correlation with the surface morphology of the photoactive layer, as determined by atomic force microscopy, could be established. Although some fulleropyrrolidines possess favorable lowest unoccupied molecular orbital levels, when compared to the standard PC71BM, they originated OPV cells with inferior efficiencies than PC71BM-based reference cells. Fulleropyrrolidines based on C60 produced, in general, better devices than those based on C70, and we attribute this observation to the detrimental effect of the structural and energetic disorder that is present in the regioisomer mixtures of C70-based fullerenes, but absent in the C60-based fullerenes. These results provide new additional knowledge on the effect of the fullerene functionalization on the efficiency of organic solar cells.

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Branched Electron-Donor Core Effect in D-π-A Star-Shaped Small Molecules on Their Properties and Performance in Single-Component and Bulk-Heterojunction Organic Solar Cells

Energies ◽

10.3390/en14123596 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3596

Author(s):

Alexander N. Solodukhin ◽

Yuriy N. Luponosov ◽

Artur L. Mannanov ◽

Petr S. Savchenko ◽

Artem V. Bakirov ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

Charge Carrier Mobility ◽

Single Component ◽

Orbital Energy ◽

Donor Acceptor ◽

And Performance ◽

Acceptor Molecules

Star-shaped donor-acceptor molecules are full of promise for organic photovoltaics and electronics. However, the effect of the branching core on physicochemical properties, charge transport and photovoltaic performance of such donor-acceptor materials in single-component (SC) and bulk heterojunction (BHJ) organic solar cells has not been thoroughly addressed. This work shows the comprehensive investigation of six star-shaped donor-acceptor molecules with terminal hexyldicyanovinyl blocks linked through 2,2′-bithiophene π-conjugated bridge to different electron-donating cores such as the pristine and fused triphenylamine, tris(2-methoxyphenyl)amine, carbazole- and benzotriindole-based units. Variation of the branching core strongly impacts on such important properties as the solubility, highest occupied molecular orbital energy, optical absorption, phase behavior, molecular packing and also on the charge-carrier mobility. The performance of SC or BHJ organic solar cells are comprehensively studied and compared. The results obtained provide insight on how to predict and fine-tune photovoltaic performance as well as properties of donor-acceptor star-shaped molecules for organic solar cells.

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The Effect of Donor:Acceptor Ratio on the Generated Photocurrent of Inkjet Printed Blended Poly (3-Octylthiophene-2.5-Diyl) and (6,6)-Phenyl C71 Butyric Acid Methyl Ester Bulk Heterojunction Organic Solar Cells

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.823 ◽

2010 ◽

Vol 663-665 ◽

pp. 823-827 ◽

Cited By ~ 3

Author(s):

Vivi Fauzia ◽

Akrajas Ali Umar ◽

Muhamad Mat Salleh ◽

Muhammad Yahaya

Keyword(s):

Solar Cells ◽

Methyl Ester ◽

Butyric Acid ◽

Organic Solar Cells ◽

Bulk Heterojunction ◽

Photovoltaic Performance ◽

Acid Methyl Ester ◽

Acid Methyl ◽

Donor And Acceptor ◽

Butyric Acid Methyl Ester

Bulk heterojunction organic solar cells made of blended of the electron donor (D) and electron acceptor (A) molecules were fabricated using inkjet printing technique with three different D:A ratios i.e. 1:3, 1:1 and 3:1 (weight). Poly (3-octylthiophene-2,5-diyl) (P3OT) and (6,6)-phenyl C71 butyric acid methyl ester (PC71BM) were used as donor and acceptor respectively. The generated photocurrents and the power conversion efficiency depend on the donor: acceptor ratio, where the device D:A ratio 3:1 generated higher photocurrent. The photovoltaic performance of the devices may also affected by the microstructure and surface morphology of the active layer film.

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