scholarly journals Improving the Photostability of Small-Molecule-Based Organic Photovoltaics by Providing a Charge Percolation Pathway of Crystalline Conjugated Polymer

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2598
Author(s):  
Jihee Kim ◽  
Chang Woo Koh ◽  
Mohammad Afsar Uddin ◽  
Ka Yeon Ryu ◽  
Song-Rim Jang ◽  
...  
Keyword(s):  
Small Molecule ◽  
Organic Photovoltaics ◽  
Conjugated Polymer ◽  
Bulk Heterojunction ◽  
Hole Mobility ◽  
Chemical Structures ◽  
Active Layers ◽  
Similar Chemical ◽  
A Charge ◽  
Soaking Test

Photostability of small-molecule (SM)-based organic photovoltaics (SM-OPVs) is greatly improved by utilizing a ternary photo-active layer incorporating a small amount of a conjugated polymer (CP). Semi-crystalline poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PPDT2FBT) and amorphous poly[(2,5-bis(2-decyltetradecyloxy)phenylene)-alt-(5,6-dicyano-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)] (PPDT2CNBT) with similar chemical structures were used for preparing SM:fullerene:CP ternary photo-active layers. The power conversion efficiency (PCE) of the ternary device with PPDT2FBT (Ternary-F) was higher than those of the ternary device with PPDT2CNBT (Ternary-CN) and a binary SM-OPV device (Binary) by 15% and 17%, respectively. The photostability of the SM-OPV was considerably improved by the addition of the crystalline CP, PPDT2FBT. Ternary-F retained 76% of its initial PCE after 1500 h of light soaking, whereas Ternary-CN and Binary retained only 38% and 17% of their initial PCEs, respectively. The electrical and morphological analyses of the SM-OPV devices revealed that the addition of the semi-crystalline CP led to the formation of percolation pathways for charge transport without disturbing the optimized bulk heterojunction morphology. The CP also suppressed trap-assisted recombination and enhanced the hole mobility in Ternary-F. The percolation pathways enabled the hole mobility of Ternary-F to remain constant during the light-soaking test. The photostability of Ternary-CN did not improve because the addition of the amorphous CP inhibited the formation of ordered SM domains.

Reduced Bimolecular Recombination in Conjugated Polymer Donor/Fullerene Acceptor Bulk Heterojunction Solar Cells

2012 ◽  
Vol 65 (5) ◽  
pp. 442 ◽  
Author(s):  
Attila J. Mozer ◽  
Tracey M. Clarke
Keyword(s):  
Solar Cells ◽  
Conjugated Polymer ◽  
Bulk Heterojunction ◽  
Polymer Solar Cells ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Roll To Roll ◽  
Active Layers ◽  
Bimolecular Recombination

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.

Scattering Techniques for Mixed Donor-Acceptor Characterization in Organic Photovoltaics

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...

scholarly journals Melt-processing of small molecule organic photovoltaics via bulk heterojunction compatibilization

2018 ◽  
Vol 20 (10) ◽  
pp. 2218-2224 ◽  
Author(s):  
Aiman Rahmanudin ◽  
Liang Yao ◽  
Xavier A. Jeanbourquin ◽  
Yongpeng Liu ◽  
Arvindh Sekar ◽  
...  
Keyword(s):  
Small Molecule ◽  
Organic Photovoltaics ◽  
Bulk Heterojunction ◽  
Melt Processing ◽  
Organic Photovoltaic ◽  
Photovoltaic Devices ◽  
Organic Photovoltaic Devices

A specially-designed molecular compatibilizer enables bulk-heterojunction organic photovoltaic devices that tolerate melt processing thus reducing the need for toxic solvents.

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.

Improvement of Interfacial Contacts for New Small-Molecule Bulk-Heterojunction Organic Photovoltaics

2012 ◽  
Vol 24 (39) ◽  
pp. 5368-5373 ◽  
Author(s):  
Andres Garcia ◽  
Gregory C. Welch ◽  
Erin L. Ratcliff ◽  
David S. Ginley ◽  
Guillermo C. Bazan ◽  
...  
Keyword(s):  
Small Molecule ◽  
Organic Photovoltaics ◽  
Bulk Heterojunction

Efficient solvent-assisted external treatment for planar heterojunction small-molecule organic solar cells

2014 ◽  
Vol 2 (26) ◽  
pp. 10250-10256 ◽  
Author(s):  
Jinhyun Kim ◽  
Ilsu Heo ◽  
Dasom Park ◽  
Sang Jung Ahn ◽  
Sung-Yeon Jang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Photovoltaics ◽  
Organic Solar Cells ◽  
Active Layers ◽  
Planar Heterojunction

We developed a novel solvent-assisted treatment (SAT) technique to modify the nanomorphology of the planar heterojunction (PHJ) bilayer active layers (ZnPc/C60) of organic photovoltaics (OPVs).

scholarly journals Correction: Twisted-graphene-like perylene diimide with dangling functional chromophores as tunable small-molecule acceptors in binary-blend active layers of organic photovoltaics

2021 ◽  
Vol 9 (38) ◽  
pp. 22140-22140
Author(s):  
Yu-Che Lin ◽  
Chung-Hao Chen ◽  
Nian-Zu She ◽  
Chien-Yao Juan ◽  
Bin Chang ◽  
...  
Keyword(s):  
Small Molecule ◽  
Organic Photovoltaics ◽  
Perylene Diimide ◽  
Binary Blend ◽  
Active Layers ◽  
Twisted Graphene

Correction for ‘Twisted-graphene-like perylene diimide with dangling functional chromophores as tunable small-molecule acceptors in binary-blend active layers of organic photovoltaics’ by Yu-Che Lin et al., J. Mater. Chem. A, 2021, DOI: 10.1039/d1ta05697b.

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