Molecular Engineering of Copolymers with Donor−Acceptor Structure for Bulk Heterojunction Photovoltaic Cells Toward High Photovoltaic Performance

2011 ◽  
Vol 115 (5) ◽  
pp. 2386-2397 ◽  
Author(s):  
Yaowen Li ◽  
Bin Xu ◽  
Hui Li ◽  
Weidong Cheng ◽  
Lili Xue ◽  
...  
Keyword(s):  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Photovoltaic Cells ◽  
Molecular Engineering ◽  
Donor Acceptor

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

2019 ◽  
Vol 10 (1) ◽  
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.

scholarly journals 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 ◽  
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.

scholarly journals Universal and versatile morphology engineering via hot fluorous solvent soaking for organic bulk heterojunction

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Tong Shan ◽  
Yi Zhang ◽  
Yan Wang ◽  
Ziyi Xie ◽  
Qingyun Wei ◽  
...  
Keyword(s):  
Small Molecule ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Solution Temperature ◽  
Temperature Dependent ◽  
Consumer Market ◽  
Upper Critical Solution Temperature ◽  
Donor Acceptor ◽  
Fluorous Solvent

Abstract After explosive growth of efficiency in organic solar cells (OSCs), achieving ideal morphology of bulk heterojunction remains crucial and challenging for advancing OSCs into consumer market. Herein, by utilizing the amphiphobic nature and temperature-dependent miscibility of fluorous solvent, hot fluorous solvent soaking method is developed to optimize the morphology with various donor/acceptor combinations including polymer/small-molecule, all-polymer and all-small-molecule systems. By immersing blend film into hot fluorous solvent which is utilized as liquid medium with better thermal conductivity, the molecular reorganization is accelerated. Furthermore, fluorous solvent can be miscible with the residue of chloroform and chloronaphthalene above upper critical solution temperature. This mixed solvent diffuses around inside the active layer and selectively promotes molecular reorganization, leading to optimized morphology. Compared to widely-used thermal annealing, this approach processed under mild conditions achieves superior photovoltaic performance, indicating the practicality and universality for morphological optimization in OSCs as well as other optoelectronic devices.

Highly efficient hybrid solar cells with tunable dipole at the donor–acceptor interface

Nanoscale ◽  
2014 ◽  
Vol 6 (18) ◽  
pp. 10545-10550 ◽  
Author(s):  
Weifei Fu ◽  
Ling Wang ◽  
Jun Ling ◽  
Hanying Li ◽  
Minmin Shi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Hybrid Solar Cells ◽  
Exciton Dissociation ◽  
Dissociation Process ◽  
Molecular Dipole ◽  
Highly Efficient ◽  
Donor Acceptor

Effects of molecular dipole at the polymer–nanocrystal interface on the energy level alignment, the exciton dissociation process, and consequently the photovoltaic performance of bulk heterojunction hybrid solar cells are systemically studied.

Donor–acceptor conjugated polymers based on two-dimensional thiophene derivatives for bulk heterojunction solar cells

2017 ◽  
Vol 8 (2) ◽  
pp. 421-430 ◽  
Author(s):  
Xin Dong ◽  
Hongkun Tian ◽  
Zhiyuan Xie ◽  
Yanhou Geng ◽  
Fosong Wang
Keyword(s):  
Solar Cells ◽  
Conjugated Polymers ◽  
Bulk Heterojunction ◽  
Photovoltaic Performance ◽  
Two Dimensional ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Π Stacking ◽  
Donor Acceptor ◽  
Thiophene Derivatives

D–A conjugated polymers based on accessible 2D conjugated (E)-1,2-bis(5-alkyl-[2,3′-bithiophen]-2′-yl)ethene units possess low bandgaps, shorter π–π stacking distances, higher mobility and higher photovoltaic performance.

scholarly journals Pseudo-Planar Organic Heterojunctions by Sequential Printing of Quasi-Miscible Inks

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 586
Author(s):  
Ana-Gianina Gereanu ◽  
Camillo Sartorio ◽  
Aurelio Bonasera ◽  
Giuliana Giuliano ◽  
Sebastiano Cataldo ◽  
...  
Keyword(s):  
Inkjet Printing ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Acid Methyl Ester ◽  
Bond Number ◽  
Molecular Organization ◽  
Low Viscosity ◽  
Donor Acceptor ◽  
Interfacial Mixing ◽  
Planar Heterojunction

This work deals with the interfacial mixing mechanism of picoliter (pL)-scale droplets produced by sequential inkjet printing of organic-based inks onto ITO/PET surfaces at a moderately high Weber number (~101). Differently from solution dispensing processes at a high Bond number such as spin coating, the deposition by inkjet printing is strictly controlled by droplet velocity, ink viscosity, and surface tension. In particular, this study considers the interfacial mixing of droplets containing the most investigated donor/acceptor couple for organic solar cells, i.e., poly(3-hexylthiophene) (P3HT) and (6,6)-phenyl-C61-butyric acid methyl ester (PCBM), showing how low-viscosity and low-surface energy inks can be leveraged for the fabrication of an interface suitable for a pseudo-planar heterojunction (pseudo-PHJ) organic solar cell (OSC) that is a convenient alternative to a bulk heterojunction (BHJ) OSC. The resulting thin-film morphology and molecular organization at the P3HT/PCBM interface are investigated, highlighting the roles of dissolution-driven molecular recirculation. This report represents a first step toward the sequential inkjet printing fabrication of pseudo-PHJ OSCs at low consumption of solvents/chemicals.

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