Effects of energy-level offset between a donor and acceptor on the photovoltaic performance of non-fullerene organic solar cells

2019 ◽  
Vol 7 (32) ◽  
pp. 18889-18897 ◽  
Author(s):  
Chenyi Yang ◽  
Jianqi Zhang ◽  
Ningning Liang ◽  
Huifeng Yao ◽  
Zhixiang Wei ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Organic Solar Cells ◽  
Photovoltaic Performance ◽  
Donor And Acceptor

This work discussed the effect of energy-level offset on photovoltaic performance of PBDB-TF-based non-fullerene OSCs and established a correlation between them.

New Anthracene‐Fused Nonfullerene Acceptors for High‐Efficiency Organic Solar Cells: Energy Level Modulations Enabling Match of Donor and Acceptor

2019 ◽  
Vol 9 (12) ◽  
pp. 1803541 ◽  
Author(s):  
Huanran Feng ◽  
Yuan‐Qiu‐Qiang Yi ◽  
Xin Ke ◽  
Jing Yan ◽  
Yamin Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Organic Solar Cells ◽  
High Efficiency ◽  
Donor And Acceptor

Influence of polymer side chains on the photovoltaic performance of non-fullerene organic solar cells

2017 ◽  
Vol 5 (4) ◽  
pp. 937-942 ◽  
Author(s):  
Xue Gong ◽  
Guangwu Li ◽  
Shiyu Feng ◽  
Liangliang Wu ◽  
Yahui Liu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Organic Solar Cells ◽  
Photovoltaic Performance ◽  
Great Influence ◽  
Molecular Packing ◽  
Side Chains ◽  
Blend Morphology

The side chains of polymers had a great influence on their molecular packing, energy level, blend morphology and photovoltaic performance. The PCEs of 7.28% and 1.55% were obtained for alkoxy and alkylthio-substituted polymer based non-fullerene solar cells, respectively.

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

2010 ◽  
Vol 663-665 ◽  
pp. 823-827 ◽  
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.

scholarly journals Single-Component Organic Solar Cells with Competitive Performance

2021 ◽  
Vol 03 (02) ◽  
pp. 228-244
Author(s):  
Yakun He ◽  
Ning Li ◽  
Christoph J. Brabec
Keyword(s):  
Solar Cells ◽  
Organic Semiconductors ◽  
Organic Solar Cells ◽  
High Efficiency ◽  
Photovoltaic Performance ◽  
Polymeric Materials ◽  
Single Component ◽  
Molecular Architecture ◽  
Chemical Structures ◽  
Donor And Acceptor

Organic semiconductors with chemically linked donor and acceptor units can realize charge carrier generation, dissociation and transport within one molecular architecture. These covalently bonded chemical structures enable single-component organic solar cells (SCOSCs) most recently to start showing specific advantages over binary or multi-component bulk heterojunction concepts due to simplified device fabrication and a dramatically improved microstructure stability. The organic semiconductors used in SCOSCs can be divided into polymeric materials, that is, double-cable polymers, di-block copolymers as well as donor–acceptor small molecules. The nature of donor and acceptor segments, the length and flexibility of the connecting linker and the resultant nanophase separation morphology are the levers which allow optimizing the photovoltaic performance of SCOSCs. While remaining at 1–2% for over a decade, efficiencies of SCOSCs have recently witnessed significant improvement to over 6% for several materials systems and to a record efficiency of 8.4%. In this mini-review, we summarize the recent progress in developing SCOSCs towards high efficiency and stability, and analyze the potential directions for pushing SCOSCs to the next efficiency milestone.

scholarly journals The Effects of Molecular Packing Behavior of Small-Molecule Acceptors in Ternary Organic Solar Cells

2021 ◽  
Vol 11 (2) ◽  
pp. 755
Author(s):  
Eunhee Lim
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Ternary System ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Orbital Energy ◽  
Working Mechanism ◽  
Energy Level Structure ◽  
The Third ◽  
Molecular Backbone

Herein, two diketopyrrolopyrrole (DPP)-based, small-molecule isomers, o- and p-DPP-PhCN, were introduced as acceptors in ternary organic solar cells (OSCs). The isomers have the same molecular backbone but differ in the positions of the cyanide (CN) substituents (ortho and para), which greatly affects their packing behavior. Ternary solar cells composed of poly(3-hexylthiophene) (P3HT):DPP-PhCN:phenyl-C61-butyric acid methyl ester (PCBM) were fabricated, and the effects of the different packing behaviors of the third component on the device performance and the working mechanism of the ternary cells were investigated. The addition of o-DPP-PhCN with a relatively high-lying lowest unoccupied molecular orbital energy level resulted in an increase in the open-circuit voltage (VOC) in the ternary devices, demonstrating the alloy-like structure of the two acceptors (o-DPP-PhCN and PCBM) in the ternary system. However, the p-DPP-PhCN-based ternary cells exhibited VOC values similar to that of a P3HT:PCBM binary cell, irrespective of the addition of p-DPP-PhCN, indicating a cascade energy-level structure in the ternary system and an effective charge transfer from the P3HT to the PCBM. Importantly, by increasing the addition of p-DPP-PhCN, the short-circuit current density increased substantially, resulting in pronounced shoulder peaks in the external quantum efficiency responses in the long-wavelength region, corresponding to the contribution of the photocurrent generated by the light absorption of p-DPP-PhCN. Despite sharing the same molecular backbone, the two DPP-PhCNs exhibited substantially different packing behaviors according to the position of their CN substituents, which also greatly affected the working mechanism of the ternary devices fabricated using the DPP-PhCNs as the third component.

Uphill and downhill charge generation from charge transfer to charge separated states in organic solar cells

2021 ◽  
Author(s):  
Shahidul Alam ◽  
Vojtech Nádaždy ◽  
Tomáš Váry ◽  
Christian Friebe ◽  
Rico Meitzner ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Solar Cells ◽  
Charge Transfer ◽  
Energy Level ◽  
Density Of States ◽  
Organic Solar Cells ◽  
Joint Density ◽  
Charge Generation ◽  
Donor Acceptor

Energy level alignments at the organic donor–acceptor interface cannot be predicted from cyclic voltammetry. Onsets for joint density of states and charge generation, reveal cases of energy uphill and – newly observed – downhill charge generation.

Energy level alignment in polymer organic solar cells at donor-acceptor planar junction formed by electrospray vacuum deposition

2014 ◽  
Vol 104 (16) ◽  
pp. 163303 ◽  
Author(s):  
Ji-Hoon Kim ◽  
Jong-Am Hong ◽  
Dae-Gyeon Kwon ◽  
Jaewon Seo ◽  
Yongsup Park
Keyword(s):  
Solar Cells ◽  
Energy Level ◽  
Organic Solar Cells ◽  
Vacuum Deposition ◽  
Energy Level Alignment ◽  
Donor Acceptor ◽  
Planar Junction

scholarly journals Organic Solar Cells: Water Ingress in Encapsulated Inverted Organic Solar Cells: Correlating Infrared Imaging and Photovoltaic Performance (Adv. Energy Mater. 20/2015)

2015 ◽  
Vol 5 (20) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jens Adams ◽  
Michael Salvador ◽  
Luca Lucera ◽  
Stefan Langner ◽  
George D. Spyropoulos ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Infrared Imaging ◽  
Photovoltaic Performance ◽  
Water Ingress ◽  
Energy Mater

Low Band-Gap Materials for Solar Cells

2021 ◽  
pp. 176-235
Keyword(s):  
Solar Cells ◽  
Band Gap ◽  
Organic Solar Cells ◽  
Charge Separation ◽  
Chemical Properties ◽  
Low Energy ◽  
Practical Applications ◽  
Film Forming ◽  
Donor And Acceptor ◽  
Induced Charge

Organic solar cells (OSCs) are discussed at length in terms of its performance leading to the generation of electricity. The key materials required for OSCs are the small organic molecules having donor and acceptor with suitable light absorption and electro-chemical properties of low energy band gap. Various structural scaffolds are highlighted with their structural design leading to film forming in an orderly manner and this morphology of film having a pivotal role in photo-induced charge separation, migration and collection at an electrode. Present day research informs that OSCs involving non fullerene based donors and acceptors are functioning with high photo conversion efficiency [PCE] of >17% and are promising candidates for practical applications.

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