Subtle Balance Between Length Scale of Phase Separation and Domain Purification in Small-Molecule Bulk-Heterojunction Blends under Solvent Vapor Treatment

2015 ◽  
Vol 27 (40) ◽  
pp. 6296-6302 ◽  
Author(s):  
Miaomiao Li ◽  
Feng Liu ◽  
Xiangjian Wan ◽  
Wang Ni ◽  
Bin Kan ◽  
...  
Keyword(s):  
Phase Separation ◽  
Small Molecule ◽  
Bulk Heterojunction ◽  
Length Scale ◽  
Solvent Vapor ◽  
Vapor Treatment

Crystallization-Induced Phase Separation in Solution-Processed Small Molecule Bulk Heterojunction Organic Solar Cells

2014 ◽  
Vol 24 (23) ◽  
pp. 3543-3550 ◽  
Author(s):  
Alexander Sharenko ◽  
Martijn Kuik ◽  
Michael F. Toney ◽  
Thuc-Quyen Nguyen
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Solution Processed

Thickness Dependent Effects of Thermal Annealing and Solvent Vapor Treatment of Poly (3-hexylthiophene) and Fullerene Bulk Heterojunction Photovoltaics

2008 ◽  
Vol 1123 ◽  
Author(s):  
Zhouying Zhao ◽  
Lynn Rice ◽  
Harry Efstathiadis ◽  
Pradeep Haldar
Keyword(s):  
Power Conversion Efficiency ◽  
Layer Thickness ◽  
Thermal Annealing ◽  
Active Layer ◽  
Conversion Efficiency ◽  
Bulk Heterojunction ◽  
Power Conversion ◽  
Active Layer Thickness ◽  
Solvent Vapor ◽  
Vapor Treatment

AbstractWe have utilized room-temperature solvent vapor treatment followed by thermal annealing to process bulk heterojunction (BHJ) photovoltaic devices based on blends of poly (3-hexylthiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) of varied active layer thickness. The morphological and photovoltaic performance characteristics of the cells subject to these treatments were found to be dependent on active layer thickness. The devices were characterized using atomic force microscopy (AFM) and opto-electrical and external quantum efficiency measurements in order to analyze the mechanism underlying the observed trend. Performance indicators including fill factor, short-circuit current and power conversion efficiency were correlated to the ordering of device active layers and morphology. The maximum power conversion efficiency achieved was 4.1 %.

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.

scholarly journals Interfacial Energetic Level Mapping and Nano-Ordering of Small Molecule/Fullerene Organic Solar Cells by Scanning Tunneling Microscopy and Spectroscopy

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 427 ◽  
Author(s):  
Irving Caballero-Quintana ◽  
Daniel Romero-Borja ◽  
José-Luis Maldonado ◽  
Juan Nicasio-Collazo ◽  
Olivia Amargós-Reyes ◽  
...  
Keyword(s):  
Solar Cells ◽  
Scanning Tunneling Microscopy ◽  
Thermal Annealing ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Solvent Vapor ◽  
Energetic Level

Using scanning tunneling microscopy (STM) and spectroscopy (STS) at the liquid/solid interface, morphology evolution process and energetic level alignment of very thin solid films (thickness: <700 pm), of the low molecular weight molecule DRCN5T and DRCN5T:[70]PCBM blend are analyzed after applying thermal annealing at different temperatures. These films exhibit a worm-like pattern without thermal annealing (amorphous shape); however, after applying thermal annealing at 120 °C, the small molecule film domains crystallize verified by X-ray diffraction: structural geometry becomes a well-defined organized array. By using STS, the energy band diagrams of the semiconductor bulk heterojunction (blended film) at the donor-acceptor interface are determined; morphology and energy characteristics can be correlated with the organic solar cells (OSC) performance. When combining thermal treatment and solvent vapor annealing processes as described in previous literature by using other techniques, OSC devices based on DRCN5T show a very acceptable power conversion efficiency of 9.0%.

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.

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.

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