Bulk Heterojunction Optoelectrical Switching Devices Fabricated Using Nonfullerene Acceptor Y6: Aggregation-Induced Emission Polymer Blend Active Layers

We show significantly reduced bimolecular recombination in a novel silole-based copolymer (KP115):fullerene blend, which allows the fabrication of polymer solar cells with relatively thick active layers. This leads to improved device efficiencies and makes roll-to-roll printing much easier. The origin of the reduced recombination, however, is not known. Our recent data suggest that published models are inadequate to explain this phenomenon.

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Scattering Techniques for Mixed Donor-Acceptor Characterization in Organic Photovoltaics

Materials Horizons ◽

10.1039/d1mh01219c ◽

2021 ◽

Author(s):

Thomas Chaney ◽

Andrew Levin ◽

Sebastian Schneider ◽

Michael F. Toney

Keyword(s):

Power Conversion Efficiency ◽

Conversion Efficiency ◽

Organic Photovoltaics ◽

Bulk Heterojunction ◽

Power Conversion ◽

Organic Photovoltaic ◽

Precise Control ◽

Active Layers ◽

Complex Morphology ◽

Donor Acceptor

Precise control of the complex morphology of organic photovoltaic bulk heterojunction (BHJ) active layers remains an important yet challenging approach for improving power conversion efficiency. Of particular interest are the...

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Impact of the Electron Acceptor Nature on the Durability and Nanomorphological Stability of Bulk Heterojunction Active Layers for Organic Solar Cells

Small ◽

10.1002/smll.202004168 ◽

2020 ◽

pp. 2004168

Author(s):

Varun Vohra ◽

Yumi Matsunaga ◽

Tomoaki Takada ◽

Ayumu Kiyokawa ◽

Luisa Barba ◽

...

Keyword(s):

Solar Cells ◽

Electron Acceptor ◽

Organic Solar Cells ◽

Bulk Heterojunction ◽

Active Layers

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Inverted polymer bulk heterojunction solar cells with ink-jet printed electron transport and active layers

Organic Electronics ◽

10.1016/j.orgel.2016.05.015 ◽

2016 ◽

Vol 35 ◽

pp. 118-127 ◽

Cited By ~ 12

Author(s):

Arjun Singh ◽

Shailendra Kumar Gupta ◽

Ashish Garg

Keyword(s):

Solar Cells ◽

Electron Transport ◽

Bulk Heterojunction ◽

Heterojunction Solar Cells ◽

Bulk Heterojunction Solar Cells ◽

Active Layers ◽

Polymer Bulk ◽

Ink Jet

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A new strategy to engineer polymer bulk heterojunction solar cells with thick active layers via self-assembly of the tertiary columnar phase

Nanoscale ◽

10.1039/c7nr03789a ◽

2017 ◽

Vol 9 (32) ◽

pp. 11511-11522 ◽

Cited By ~ 5

Author(s):

Hongfei Li ◽

Zhenhua Yang ◽

Cheng Pan ◽

Naisheng Jiang ◽

Sushil K. Satija ◽

...

Keyword(s):

Self Assembly ◽

Organic Solar Cell ◽

Bulk Heterojunction ◽

Ternary Blend ◽

Heterojunction Solar Cells ◽

Roll To Roll ◽

Active Layers ◽

Polymer Bulk ◽

New Strategy ◽

Cell Fabrication

A self-assembled ternary blend bulk heterojunction increases the optimal blend thickness, making it suitable for practical roll-to-roll organic solar cell fabrication.

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Theoretical Investigations of Polymer Based Solar Cells

MRS Proceedings ◽

10.1557/proc-822-s7.7 ◽

2004 ◽

Vol 822 ◽

Cited By ~ 1

Author(s):

Robert S. Echols ◽

Chris E. France

Keyword(s):

Solar Cells ◽

Solar Cell ◽

Band Gap ◽

Polymer Blend ◽

Bulk Heterojunction ◽

Power Conversion ◽

Normal Incidence ◽

Open Circuit ◽

Action Spectra ◽

Conversion Efficiencies

AbstractWe investigate the behavior of a polymer blend (M3EH-PPV:CN-ether-PPV) bulk heterojunction solar cell using a numeric model that self-consistently solves Poisson's equation and the charge continuity equation while incorporating electric field dependent mobilities. We obtain good quantitative agreement with present experimental data for J-V curves and photocurrent action spectra. To reproduce experimental photocurrent action spectra, our model predicts 36% exciton dissociation efficiencies in the bulk of the polymer. We also study the limiting conditions of polymer solar cell development by simulating an ideal solar cell using an AM1.5 global spectrum and assuming all absorbed photons hitting a M3EH-PPV:CN-ether-PPV polymer blend (band gap ∼2.0 eV) based solar cell at normal incidence contribute to current. If such a solar cell has 100 nm length, open circuit voltage=0.6 V and 50% fill factor, then the maximum theoretical power conversion efficiency is ηp=5.6%. A similar analysis for a M3EH-PPV:PCBM bulk heterojunction cell yields, ηp=3.5%. These results further highlight the need to develop smaller band gap materials and help explain why the best polymer based solar cells have power conversion efficiencies that remain stuck at about 3%. Our model is used to investigate the important increase in power conversion efficiencies we can expect as lower band gap polymers become available.

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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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Study of Photovoltaic Devices with Hybrid Active Layer

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.293.51 ◽

2019 ◽

Vol 293 ◽

pp. 51-64

Author(s):

Pawel Jarka ◽

Tomasz Tański ◽

Bartlomiej Hrapkowicz ◽

Barbara Hajduk ◽

Kamil Bystroń ◽

...

Keyword(s):

Optical Properties ◽

Bulk Heterojunction ◽

Photovoltaic Cells ◽

Deposition Process ◽

Thin Layers ◽

Force Microscopy ◽

Active Layers ◽

Transmission Electron ◽

Current Voltage ◽

The Individual

The aim of this work is to present the influences of composition of the material and manufacturing technology conditions of the organic photovoltaics devices (OPv) with the organic and hybrid bulk heterojunction on the active layers properties and cells performance. The layers were produced by using small molecular compounds: the metal-phthalocyanine (MePc) and perylene derivatives (PTCDA) and the titanium dioxide (TiO2) nanoparticles. Two kinds of metal phthalocyanines (NiPc, TiOPc) were used as donor material and pperylenetetracarboxylic dianhydride (PTCDA) as an acceptor. The used manufacturing technique allowed to employ thin layers of materials in a fast deposition process. Bulk heterojunction was created by simultaneously applying the MePc:PTCDA materials during the evaporation of the components mixture.The research was based on the estimate of composition of bulk heterojunction, the examination of the surface morphology of the used layers and optical properties studies of the heterojunction and its implementation to photovoltaic architecture. The produced photovoltaic cells parameters were determined on the basis of current - voltage characteristics.The researches of structure of obtained layers were conducted by using scanning electron microscope (SEM) and transmission electron microscopy (TEM). The quantitative determination of surface topography by determining RMS and Ra coefficients were performed by atomic force microscopy (AFM). In order to determine the optical properties of the films the UV-Visible spectroscope have been utilized. Current - voltage characteristics were employed to determine the basic photovoltaic parameters using a dedicated device.The paper describes the influence of the individual components sharing the bulk heterojunction on its structure, optical properties and morphology of surface. In addition it allows for linking active layers properties with the parameters of the photovoltaic cells. The obtained results suggest the possibility of developing the utilized materials and technology in the further works on photovoltaic structures.

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