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 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.

Crystal-structure of active layers of small molecule organic photovoltaics before and after solvent vapor annealing

2020 ◽  
Vol 235 (1-2) ◽  
pp. 15-28
Author(s):  
Marvin Berlinghof ◽  
Stefan Langner ◽  
Christina Harreiß ◽  
Ella Mara Schmidt ◽  
Rita Siris ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Small Molecule ◽  
Organic Photovoltaics ◽  
Acid Methyl Ester ◽  
Fiber Texture ◽  
Solvent Vapor ◽  
X Ray ◽  
Vapor Annealing ◽  
Solvent Vapor Annealing ◽  
Solvent Vapors

AbstractIt is demonstrated by a detailed structural analysis that the crystallinity and the efficiency of small molecule based organic photovoltaics can be tuned by solvent vapor annealing (SVA). Blends made of the small molecule donor 2,2′-[(3,3′″,3″″,4′-tetraoctyl[2,2′:5′,2″:5″,2′″:5′″,2″″-quinquethiophene]-5,5″″-diyl)bis[(Z)-methylidyne(3-ethyl-4-oxo-5,2-thiazolidinediylidene)]]bis-propanedinitrile (DRCN5T) and the acceptor [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) were annealed using solvent vapors with either a high solubility for the donor (tetrahydrofuran), the acceptor (carbon disulfide) or both (chloroform). The samples were analyzed by grazing-incidence wide-angle X-ray scattering (GIWAXS), electron diffraction, X-ray pole figures, and time-of-flight secondary ion mass spectrometry (ToF-SIMS). A phase separation of DRCN5T and PC71BM is induced by SVA leading to a crystallization of DRCN5T and the formation of a DRCN5T enriched layer. The DRCN5T crystallites possess the two dimensional oblique crystal system with the lattice parameters a = 19.2 Å, c = 27.1 Å, and β = 111.1° for the chloroform case. No major differences in the crystal structure for the other solvent vapors were observed. However, the solvent choice strongly influences the size of the DRCN5T enriched layer. Missing periodicity in the [010]-direction leads to the extinction of all Bragg reflections with k ≠ 0. The annealed samples are randomly orientated with respect to the normal of the substrate (fiber texture).

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.

Effects of solvent vapor annealing on organic photovoltaics with a new type of solution-processable oligothiophene-based electronic donor material

2018 ◽  
Vol 57 (8S3) ◽  
pp. 08RE09 ◽  
Author(s):  
Yuki Akiyama ◽  
Hiroaki Tachibana ◽  
Reiko Azumi ◽  
Tetsuhiko Miyadera ◽  
Masayuki Chikamatsu ◽  
...  
Keyword(s):  
Organic Photovoltaics ◽  
Solvent Vapor ◽  
Donor Material ◽  
Vapor Annealing ◽  
New Type ◽  
Solvent Vapor Annealing ◽  
Solution Processable

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%.

Origin of Reduced Open-Circuit Voltage in Highly Efficient Small-Molecule-Based Solar Cells upon Solvent Vapor Annealing

2018 ◽  
Vol 10 (9) ◽  
pp. 8141-8147 ◽  
Author(s):  
Wanyuan Deng ◽  
Ke Gao ◽  
Jun Yan ◽  
Quanbin Liang ◽  
Yuan Xie ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Solvent Vapor ◽  
Highly Efficient ◽  
Vapor Annealing ◽  
Solvent Vapor Annealing

Preparation of Single Crystals of Small Molecule Organic Semiconductor via Solvent Vapor Annealing

2015 ◽  
Vol 73 (1) ◽  
pp. 23
Author(s):  
Junhui Wu ◽  
Yi Yuan ◽  
Mingyuan Gao ◽  
Zhe Wang ◽  
Lei Jiang
Keyword(s):  
Single Crystals ◽  
Small Molecule ◽  
Organic Semiconductor ◽  
Solvent Vapor ◽  
Vapor Annealing ◽  
Solvent Vapor Annealing

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.

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