A block copolymer enhances the efficiency of small-molecule bulk-heterojunction photovoltaics

2016 ◽  
Vol 4 (6) ◽  
pp. 2228-2235 ◽  
Author(s):  
Hsiu-Cheng Chen ◽  
Yu-Wei Su ◽  
Kung-Hwa Wei
Keyword(s):  
Block Copolymer ◽  
Active Layer ◽  
Small Molecule ◽  
Bulk Heterojunction ◽  
Device Efficiency ◽  
Bulk Heterojunction Photovoltaics

Using a PS-b-PEO block copolymer in the active layer allowed effective tuning of the small molecule active layer morphology and enhanced device efficiency.

scholarly journals Synergetic Enhancement of Device Efficiency in Poly(3-hexylthiophene-2,5-diyl)/[6,6]-phenyl C61Butyric Acid Methyl Ester Bulk Heterojunction Solar Cells by Glycerol Addition in the Active Layer

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Bobins Augustine ◽  
Tapio Fabritius
Keyword(s):  
Solar Cells ◽  
Methyl Ester ◽  
Active Layer ◽  
Bulk Heterojunction ◽  
Acid Methyl Ester ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Acid Methyl ◽  
Device Efficiency ◽  
High Boiling Point

Poly(3-hexylthiophene-2,5-diyl)(P3HT):[6,6]-phenyl-C61-butyric acid methyl ester (PC60BM) is the widely used active layer for the bulk heterojunction solar cells. Annealing is essential for P3HT:PC60BM active layer, since it facilitates the creation of better network for the transfer of the charge carriers. However, the PC60BM in the active layer can crystallize excessively during annealing treatments and disrupt the favorable morphology by forming crystallites in micrometer ranges, thus reducing device efficiency. In this paper we used glycerol as an additive in the active layer. Due to high boiling point of glycerol, it makes slow drying of the active layer possible during the annealing. It thus gives enough time to both electron donor (P3HT) and electron acceptor (PC60BM) components of the active layer to self-organize and also restrict the crystal overgrowth of PC60BM. Further, the glycerol additive makes the active layer smoother, which may also improve adhesion between the electrode and the active layer. The devices with the pristine active layer showed a power conversion efficiency (PCE) of about 2.1% and, with the addition of 30 vol% of glycerol in the active layer, the PCE value increased to 3%.

Effect of Bridging Atom Identity on the Morphological Behavior of Solution-Processed Small Molecule Bulk Heterojunction Photovoltaics

2013 ◽  
Vol 25 (9) ◽  
pp. 1688-1698 ◽  
Author(s):  
Nancy D. Eisenmenger ◽  
Gregory M. Su ◽  
Gregory C. Welch ◽  
Christopher J. Takacs ◽  
Guillermo C. Bazan ◽  
...  
Keyword(s):  
Small Molecule ◽  
Bulk Heterojunction ◽  
Solution Processed ◽  
Bulk Heterojunction Photovoltaics ◽  
Morphological Behavior

scholarly journals Morphology stabilization strategies for small-molecule bulk heterojunction photovoltaics

2017 ◽  
Vol 5 (33) ◽  
pp. 17517-17524 ◽  
Author(s):  
Aiman Rahmanudin ◽  
Xavier A. Jeanbourquin ◽  
Simon Hänni ◽  
Arvindh Sekar ◽  
Emilie Ripaud ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solar Cells ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Bulk Heterojunction Photovoltaics ◽  
Thermal Stability Of

Strategies for enhancing the thermal stability of small-molecule organic solar cells are demonstrated and compared with two molecularly engineered additives.

A novel carbazole–phenothiazine dyad small molecule as a non-fullerene electron acceptor for polymer bulk heterojunction solar cells

RSC Advances ◽  
2014 ◽  
Vol 4 (63) ◽  
pp. 33279-33285 ◽  
Author(s):  
G. D. Sharma ◽  
M. Anil Reddy ◽  
D. V. Ramana ◽  
M. Chandrasekharam
Keyword(s):  
Solar Cells ◽  
Active Layer ◽  
Small Molecule ◽  
Electron Acceptor ◽  
Organic Molecule ◽  
Bulk Heterojunction ◽  
Small Organic Molecule ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Polymer Bulk

A small organic moleculeCSORG5developed as non fullerene acceptor for BHJ solar cells. The device based on P3HT : CSORG5(1 : 1) spin coated from DIO/THF showed high PCE 2.80% compared to spin coated from THF. The PCE has been further increased to 4.16%, when the TiO2film was inserted between the active layer and Al electrode.

scholarly journals Parallel bulk heterojunction photovoltaics based on all-conjugated block copolymer additives

2016 ◽  
Vol 4 (38) ◽  
pp. 14804-14813 ◽  
Author(s):  
Jorge W. Mok ◽  
Dylan Kipp ◽  
Luis R. Hasbun ◽  
Andrei Dolocan ◽  
Joseph Strzalka ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Open Circuit Voltage ◽  
Bulk Heterojunction ◽  
Open Circuit ◽  
Bulk Heterojunction Photovoltaics ◽  
Parallel Type

All-conjugated block copolymer additives enhance open circuit voltage through formation of parallel-type bulk heterojunction photovoltaics.

Effect of thermal annealing on active layer morphology and performance for small molecule bulk heterojunction organic solar cells

2014 ◽  
Vol 2 (35) ◽  
pp. 7247-7255 ◽  
Author(s):  
Zuo Yi ◽  
Wang Ni ◽  
Qian Zhang ◽  
Miaomiao Li ◽  
Bin Kan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Thermal Annealing ◽  
Active Layer ◽  
Small Molecule ◽  
Organic Solar Cells ◽  
Bulk Heterojunction ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
And Performance ◽  
The Impact

Bulk heterojunction solar cells based on a novel small molecule (DRDTSBDTT) were systematically investigated to understand the impact of thermal annealing on Voc, Jsc and FF.

Efficiency enhancement of organic photovoltaics by introducing high-mobility curved small-molecule semiconductors as additives

2019 ◽  
Vol 7 (20) ◽  
pp. 12740-12750 ◽  
Author(s):  
Shenghua Liu ◽  
Changqing Li ◽  
Xiaomin Xu ◽  
Peng You ◽  
Naixiang Wang ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Active Layer ◽  
Small Molecule ◽  
Organic Photovoltaics ◽  
High Mobility ◽  
Hole Mobility ◽  
Significant Enhancement ◽  
Efficiency Enhancement ◽  
Highly Efficient ◽  
Device Efficiency

Highly efficient OPVs are successfully fabricated by introducing high-mobility curved organic semiconductors. The significant enhancement of the device efficiency induced by the curved molecules can be attributed to increased hole mobility in the active layer and intimate interaction between the curved molecules and PC71BM.

Soluble porphyrin donors for small molecule bulk heterojunction solar cells

2012 ◽  
Vol 22 (36) ◽  
pp. 19258 ◽  
Author(s):  
Junichi Hatano ◽  
Naoki Obata ◽  
Shigeru Yamaguchi ◽  
Takeshi Yasuda ◽  
Yutaka Matsuo
Keyword(s):  
Solar Cells ◽  
Small Molecule ◽  
Bulk Heterojunction ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells

Interfacial Energy Alignment at the ITO/Ultra-Thin Electron Selective Dielectric Layer Interface and Its Effect on the Efficiency of Bulk-Heterojunction Organic Solar Cells

2016 ◽  
Vol 16 (4) ◽  
pp. 3248-3253 ◽  
Author(s):  
Eiji Itoh ◽  
Yoshinori Goto ◽  
Yusuke Saka ◽  
Katsutoshi Fukuda
Keyword(s):  
Contact Resistance ◽  
Active Layer ◽  
Surface Potential ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Bulk Heterojunction ◽  
Electronic Charge ◽  
Photovoltaic Properties ◽  
Potential Measurement ◽  
Layer Interface

We have investigated the photovoltaic properties of an inverted bulk heterojunction (BHJ) cell in a device with an indium-tin-oxide (ITO)/electron selective layer (ESL)/P3HT:PCBM active layer/MoOx/Ag multilayered structure. The insertion of only single layer of poly(diallyl-dimethylammonium chloride) (PDDA) cationic polymer film (or poly(ethyleneimine) (PEI) polymeric interfacial dipole layer) and titanium oxide nanosheet (TN) films as an ESL effectively improved cell performance. Abnormal S-shaped curves were observed in the inverted BHJ cells owing to the contact resistance across the ITO/active layer interface and the ITO/PDDA/TN/active layer interface. The series resistance across the ITO/ESL interface in the inverted BHJ cell was successfully reduced using an interfacial layer with a positively charged surface potential with respect to ITO base electrode. The positive dipole in PEI and the electronic charge phenomena at the electrophoretic deposited TN (ED-TN) films on ITO contributed to the reduction of the contact resistance at the electrode interface. The surface potential measurement revealed that the energy alignment by the transfer of electronic charges from the ED-TN to the base electrodes. The insertion of the ESL with a large positive surface potential reduced the potential barrier for the electron injection at ITO/TN interface and it improved the photovoltaic properties of the inverted cell with an ITO/TN/active layer/MoOx/Ag structure.

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