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Sigma-Aldrich

PTB7

greener alternative

average Mw 80,000-200,000, PDI ≤3.0

Synonym(s):

Poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl})

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About This Item

Empirical Formula (Hill Notation):
(C41H53FO4S4)n
CAS Number:
UNSPSC Code:
12352103
NACRES:
NA.23

description

Band gap: 1.84 eV

Quality Level

form

solid

mol wt

average Mw 80,000-200,000

greener alternative product characteristics

Design for Energy Efficiency
Learn more about the Principles of Green Chemistry.

sustainability

Greener Alternative Product

solubility

chlorobenzene: soluble
chloroform: soluble
dichlorobenzene: soluble

λmax

680 nm (thin film)

Orbital energy

HOMO -5.15 eV 
LUMO -3.31 eV 

Mw/Mn

2.4 +/- 0.6

PDI

≤3.0

greener alternative category

General description

PTB7 is a semiconducting polymer used in organic photovoltaics with an energy efficiency of 9.15%. It can act as an electron donor with narrow optical band gaps and excellent π-π conjugation while forming a nanocomposite with fullerenes.
We are committed to bringing you Greener Alternative Products, which adhere to one or more of The 12 Principles of Greener Chemistry. This product belongs to Enabling category of greener alternatives thus aligns with "Design for energy efficency". Hole transport organic materials allow perfect energy level alignment with the absorber layer and therefore efficient charge collection, are prone to degradation in ambient conditions.Click here for more information.

Application

High-Efficiency Organic Solar Cells (OPVs)
OPV Device Structure: ITO/PEDOT:PSS/PTB7 :PC71BM/Ca/Al
  • JSC = 14.9 mA/cm2
  • VOC = 0.75 V
  • FF = 0.69
  • PCE = 7.4%
It is majorly used as an active layer that enhances the overall performance by increasing the light absorption and improving the electron mobility of polymeric solar cells (PSCs).

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Highly efficient tandem polymer photovoltaic cells
Sista S, et al.
Advanced Materials, 22(3), 380-383 (2010)
Sylvia J Lou et al.
Journal of the American Chemical Society, 133(51), 20661-20663 (2011-12-01)
Processing additives are used in organic photovoltaic systems to optimize the active layer film morphology. However, the actual mechanism is not well understood. Using X-ray scattering techniques, we analyze the effects of an additive diiodooctane (DIO) on the aggregation of
For the bright future-bulk heterojunction polymer solar cells with power conversion efficiency of 7.4%.
Yongye Liang et al.
Advanced materials (Deerfield Beach, Fla.), 22(20), E135-E138 (2010-07-20)
Absolute measurement of domain composition and nanoscale size distribution explains performance in PTB7: PC71BM solar cells
Collins BA, et al.
Advanced Energy Materials, 3(1), 65-74 (2013)
ZnO: CNT assisted charge transport in PTB7: PCBM blend organic solar cell
Oseni SO, et al.
Journal of alloys and compounds, 748(1), 216-222 (2018)

Articles

The development of high-performance conjugated organic molecules and polymers has received widespread attention in industrial and academic research.

Organic photovoltaics (OPVs) represent a low-cost, lightweight, and scalable alternative to conventional solar cells. While significant progress has been made in the development of conventional bulk heterojunction cells, new approaches are required to achieve the performance and stability necessary to enable commercially successful OPVs.

Professor Chen (Nankai University, China) and his team explain the strategies behind their recent record-breaking organic solar cells, reaching a power conversion efficiency of 17.3%.

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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