scholarly journals Engineered exciton diffusion length enhances device efficiency in small molecule photovoltaics

2018 ◽  
Vol 6 (20) ◽  
pp. 9445-9450 ◽  
Author(s):  
Muhammad T. Sajjad ◽  
Oskar Blaszczyk ◽  
Lethy Krishnan Jagadamma ◽  
Thomas J. Roland ◽  
Mithun Chowdhury ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Small Molecule ◽  
Diffusion Length ◽  
Bulk Heterojunction ◽  
Domain Size ◽  
Device Performance ◽  
Solvent Vapor ◽  
Exciton Diffusion Length ◽  
Vapor Annealing ◽  
Solvent Vapor Annealing

A post processing method of solvent vapor annealing (SVA) enhances the diffusion length (LD) and domain size in small molecule organic semiconductors which leads to an enhancement in device performance in bulk heterojunction organic photovoltaics.

scholarly journals Reduced bimolecular recombination in blade-coated, high-efficiency, small-molecule solar cells

2017 ◽  
Vol 5 (15) ◽  
pp. 6893-6904 ◽  
Author(s):  
Sebastian Engmann ◽  
Hyun Wook Ro ◽  
Andrew A. Herzing ◽  
Dean M. DeLongchamp ◽  
Chad R. Snyder ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
High Efficiency ◽  
Bulk Heterojunction ◽  
Annealing Process ◽  
Device Performance ◽  
Solvent Vapor ◽  
Vapor Annealing ◽  
Bimolecular Recombination ◽  
Solvent Vapor Annealing

We report the performance and morphology of blade-coated bulk heterojunction devices based on the small molecule donor p-DTS(FBTTh2)2 treated with a postdeposition solvent vapor annealing process that improves the device performance and significantly reduces bimolecular recombination.

Phenothiazine-based small-molecule organic solar cells with power conversion efficiency over 7% and open circuit voltage of about 1.0 V using solvent vapor annealing

2018 ◽  
Vol 20 (9) ◽  
pp. 6321-6329 ◽  
Author(s):  
Yogajivan Rout ◽  
Rajneesh Misra ◽  
Rahul Singhal ◽  
Subhayan Biswas ◽  
Ganesh D. Sharma
Keyword(s):  
Solar Cells ◽  
Small Molecules ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Open Circuit ◽  
Solvent Vapor ◽  
Heterojunction Solar Cells ◽  
Vapor Annealing ◽  
Solvent Vapor Annealing

We have used two unsymmetrical small molecules with a D–A–D–π–D configuration as small molecule donors, along with PC71BM as an acceptor, for solution processed bulk heterojunction solar cells.

Side chain engineering in DTBDT-based small molecules for efficient organic photovoltaics

Nanoscale ◽  
2019 ◽  
Vol 11 (29) ◽  
pp. 13845-13852 ◽  
Author(s):  
Jisu Hong ◽  
Ji Young Choi ◽  
Kyunghun Kim ◽  
Nam-Suk Lee ◽  
Jiqiang Li ◽  
...  
Keyword(s):  
Small Molecules ◽  
Small Molecule ◽  
Organic Photovoltaics ◽  
Side Chain ◽  
Solvent Vapor ◽  
Vapor Annealing ◽  
Solvent Vapor Annealing

A new small-molecule donor with a DTBDT core exhibits apposite blend morphologies and a maximum PCE of 9.18% by side chain engineering and solvent vapor annealing.

scholarly journals Excited state dynamics and exciton diffusion in triphenylamine/dicyanovinyl push–pull small molecule for organic optoelectronics

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Benedito A. L. Raul ◽  
Yuriy N. Luponosov ◽  
Wenyan Yang ◽  
Nikolay M. Surin ◽  
Olivier Douhéret ◽  
...  
Keyword(s):  
Excited State ◽  
Small Molecule ◽  
Potential Energy Surfaces ◽  
Density Functional ◽  
Diffusion Length ◽  
Bulk Heterojunction ◽  
Radiative Relaxation ◽  
Research Attention ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

AbstractTriphenylamine-based small push–pull molecules have recently attracted substantial research attention due to their unique optoelectronic properties. Here, we investigate the excited state de-excitation dynamics and exciton diffusion in TPA-T-DCV-Ph-F small molecule, having simple chemical structure with asymmetrical architecture and end-capped with electron-withdrawing p-fluorodicyanovinyl group. The excited state lifetime in diluted solutions (0.04 ns in toluene and 0.4 ns in chloroform) are found to be surprisingly shorter compared to the solid state (3 ns in PMMA matrix). Time-dependent density functional theory indicates that this behavior originates from non-radiative relaxation of the excited state through a conical intersection between the ground and singlet excited state potential energy surfaces. Exciton diffusion length of ~ 16 nm in solution processed films was retrieved by employing time-resolved photoluminescence volume quenching measurements with Monte Carlo simulations. As means of investigating the device performance of TPA-T-DCV-Ph-F, we manufactured solution and vacuum processed bulk heterojunction solar cells that yielded efficiencies of ~ 1.5% and ~ 3.7%, respectively. Our findings demonstrate that the short lifetime in solutions does not hinder per se long exciton diffusion length in films thereby granting applications of TPA-T-DCV-Ph-F and similar push–pull molecules in vacuum and solution processable devices.

Understanding the effect of solvent vapor annealing on solution-processed A–D–A oligothiophene bulk-heterojunction solar cells: the role of alkyl side chains

2016 ◽  
Vol 4 (7) ◽  
pp. 2571-2580 ◽  
Author(s):  
Cordula D. Wessendorf ◽  
Ana Perez-Rodriguez ◽  
Jonas Hanisch ◽  
Andreas P. Arndt ◽  
Ibrahim Ata ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Solvent Vapor ◽  
Heterojunction Solar Cells ◽  
Effect Of Solvent ◽  
Vapor Annealing ◽  
Alkyl Side Chains ◽  
Solvent Vapor Annealing

Solvent vapor annealing (SVA) can strongly influence the morphology of oligomer:fullerene based organic solar cells.

scholarly journals Numerical Analysis of Optical Absorption Effect in Nonhalogen Solution-Processed, Inverted Small Molecule Solar Cell

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 113
Author(s):  
Ming-Yi Lin ◽  
Chun-Yu Lee
Keyword(s):  
Small Molecule ◽  
Power Conversion ◽  
Organic Photovoltaic ◽  
Absorption Effect ◽  
Solution Processed ◽  
Solvent Vapor ◽  
Vapor Annealing ◽  
Solvent Vapor Annealing ◽  
Halogen Free ◽  
Photovoltaic Solar Cells

Inverted solution-processed SMPV1:PC71BM small molecule organic photovoltaic solar cells (SM-OPVs) were fabricated. The power conversion efficiency (PCE) of halogen-free SM-OPVs reached around 5.07%. The absorption spectra at different device thicknesses were simulated by software Fluxim SETFOS 5.0, and compared with the experimental results. To further enhance the performance of halogen-free SM-OPVs, the interface between the active layer and the electrode of the optimized device was treated with the solvent vapor annealing (SVA) process, improving the PCE of the inverted halogen-free SM-OPV to 7.21%.

scholarly journals Improving the efficiencies of small molecule solar cells by solvent vapor annealing to enhance J-aggregation

2019 ◽  
Vol 7 (31) ◽  
pp. 9618-9624 ◽  
Author(s):  
Liangang Xiao ◽  
Zhengdong Li ◽  
Qin Hu ◽  
Yawei Liu ◽  
Wenkai Zhong ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecules ◽  
Small Molecule ◽  
Film Morphology ◽  
Solvent Vapor ◽  
Vapor Annealing ◽  
Solvent Vapor Annealing

The enhanced J-aggregation increases the crystallinity of the small molecules and forms a favorable film morphology with a fiber-like structure.

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