Morphology, molecular stacking, dynamics and device performance correlations of vacuum-deposited small-molecule organic solar cells

2014 ◽  
Vol 16 (19) ◽  
pp. 8852-8864 ◽  
Author(s):  
Chang-Wen Chen ◽  
Zheng-Yu Huang ◽  
Yi-Min Lin ◽  
Wei-Ching Huang ◽  
Yi-Hong Chen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Device Performance ◽  
Molecular Stacking

The “all carbon” organic solar cells based on the homocyclic molecule DBP as a donor and C60as an acceptor were comprehensively characterized.

scholarly journals Crystallites ofα-Sexithiophene in Bilayer Small Molecule Organic Solar Cells Double Efficiency

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Michal Radziwon ◽  
André Luis Fernandes Cauduro ◽  
Morten Madsen ◽  
Horst-Günter Rubahn
Keyword(s):  
Solar Cells ◽  
Research And Development ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Device Performance ◽  
Performance Parameters ◽  
Efficiency Increase ◽  
Conversion Efficiencies

Recent efforts in research and development of small molecule based organic solar cells have led to power conversion efficiencies exceeding 10%. Understanding the incorporated interfaces in these devices is an utterly important parameter for their improvement. Here we investigate the influence ofα-sexithiophene (α-6T) nanostructures on the performance parameters ofα-6T/C60inverted bilayer solar cells. Byin situcontrolled growth, crystallineα-6T nanostructures are formed in the devices and a correlation between the morphology of the structures and the device performance is presented. Under certain, well-defined circumstances, we observe an efficiency increase of around 100% when implementing crystalline nanostructures.

Cathode interlayer-free organic solar cells with enhanced device performance upon alcohol treatment

2019 ◽  
Vol 7 (26) ◽  
pp. 7947-7952 ◽  
Author(s):  
Xuebin Chen ◽  
Bei Zhu ◽  
Bin Kan ◽  
Ke Gao ◽  
Xiaobin Peng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Alcohol Treatment ◽  
Device Performance ◽  
Device Structure ◽  
Solvent Treatment ◽  
Cathode Interlayer

Solvent treatment was used to simplify the device structure and enhance the device performance of porphyrin-based small molecule solar cells.

scholarly journals Small-Molecule Donor/Polymer Acceptor Type Organic Solar Cells: Effect of Terminal Groups of Small-Molecule Donors

2019 ◽  
Vol 01 (01) ◽  
pp. 088-094 ◽  
Author(s):  
Junhui Miao ◽  
Bin Meng ◽  
Jun Liu ◽  
Lixiang Wang
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Photovoltaic Performance ◽  
Terminal Group ◽  
Device Performance ◽  
The Core ◽  
Polymer Acceptor ◽  
The One

Small-molecule donor/polymer acceptor type (MD/PA-type) organic solar cells (OSCs) have the great advantage of superior thermal stability. However, very few small molecular donors can match polymer acceptors, leading to low power conversion efficiency (PCE) of MD/PA-type OSCs. In this work, we studied the effect of terminal groups of small molecular donors on the optoelectronic properties and OSC device performance of MD/PA-type OSCs. We select a benzodithiophene unit bearing carbazolyl substituents as the core, terthiophene as the bridging unit, and electron-withdrawing methyl 2-cyanoacetate, 3-ethylrhodanine, and 2H-indene-1,3-dione as the terminal groups to develop three small-molecule donors. With the increase of the electron-withdrawing capability of the terminal groups, the small molecular donors exhibit redshifted absorption spectra and downshifted LUMO levels. Among the three small-molecule donors, the one with 3-ethylrhodanine terminal group exhibits the best photovoltaic performance with the PCE of 8.0% in MD/PA-type OSCs. This work provides important guidelines for the design of small-molecule donors for MD/PA-type OSC applications.

scholarly journals Design of All-Small-Molecule Organic Solar Cells Approaching 14% Efficiency via Isometric Terminal Alkyl Chain Engineering

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2505
Author(s):  
Haiyan Chen ◽  
Hua Tang ◽  
Dingqin Hu ◽  
Yiqun Xiao ◽  
Jiehao Fu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Performance ◽  
Alkyl Chain ◽  
Photovoltaic Performance ◽  
Engineering Process ◽  
Transport Channel ◽  
Fine Tune ◽  
Molecular Stacking

Morphology is crucial to determining the photovoltaic performance of organic solar cells (OSCs). However, manipulating morphology involving only small-molecule donors and acceptors is extremely challenging. Herein, a simple terminal alkyl chain engineering process is introduced to fine-tune the morphology towards high-performance all-small-molecule (ASM) OSCs. We successfully chose a chlorinated two-dimension benzo[1,2-b:4,5-b′]dithiophene (BDT) central unit and two isomeric alkyl cyanoacetate as the end-capped moieties to conveniently synthesize two isomeric small-molecule donors, namely, BT-RO-Cl and BT-REH-Cl, each bearing linear n-octyl (O) as the terminal alkyl chain and another branched 2-ethylhexyl (EH) as the terminal alkyl chain. The terminal alkyl chain engineering process provided BT-RO-Cl with 13.35% efficiency and BT-REH-Cl with 13.90% efficiency ASM OSCs, both with Y6 as the electron acceptor. The successful performance resulted from uniform phase separation and the favorable combination of face-on and edge-on molecular stacking of blended small-molecule donors and acceptors, which formed a fluent 3D transport channel and thus delivered high and balanced carrier mobilities. These findings demonstrate that alkyl chain engineering can finely control the morphology of ASM OSCs, and provides an alternative for the optimal design of small-molecule materials towards high-performance ASM OSCs.

Effects of alkyl chains on intermolecular packing and device performance in small molecule based organic solar cells

2017 ◽  
Vol 141 ◽  
pp. 262-268 ◽  
Author(s):  
Yamin Zhang ◽  
Miaomiao Li ◽  
Huanran Feng ◽  
Wang Ni ◽  
Hongtao Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Device Performance ◽  
Alkyl Chains

Toward high performance indacenodithiophene-based small-molecule organic solar cells: investigation of the effect of fused aromatic bridges on the device performance

2016 ◽  
Vol 4 (6) ◽  
pp. 2252-2262 ◽  
Author(s):  
Jin-Liang Wang ◽  
Fei Xiao ◽  
Jun Yan ◽  
Kai-Kai Liu ◽  
Zheng-Feng Chang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecules ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Performance ◽  
Device Performance ◽  
Photovoltaic Properties

Here we report the synthesis of a pair of D1–A-bridge–D2-bridge–A–D1 type small molecules, which have different π-conjugated bridges and investigated the effects on their photovoltaic properties.

The Effect of Donor Molecular Structure on Power Conversion Efficiency of Small-Molecule-Based Organic Solar Cells

2019 ◽  
Vol 16 (3) ◽  
pp. 236-243 ◽  
Author(s):  
Hui Zhang ◽  
Yibing Ma ◽  
Youyi Sun ◽  
Jialei Liu ◽  
Yaqing Liu ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Molecular Design ◽  
Power Conversion ◽  
The Relationship

In this review, small-molecule donors for application in organic solar cells reported in the last three years are highlighted. Especially, the effect of donor molecular structure on power conversion efficiency of organic solar cells is reported in detail. Furthermore, the mechanism is proposed and discussed for explaining the relationship between structure and power conversion efficiency. These results and discussions draw some rules for rational donor molecular design, which is very important for further improving the power conversion efficiency of organic solar cells based on the small-molecule donor.

Fullerene/Non-fullerene Alloy for High-Performance All-Small-Molecule Organic Solar Cells

2021 ◽  
Vol 13 (5) ◽  
pp. 6461-6469
Author(s):  
María Privado ◽  
Fernando G. Guijarro ◽  
Pilar de la Cruz ◽  
Rahul Singhal ◽  
Fernando Langa ◽  
...  
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
High Performance
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