Synthesis of Perfluoroalkyl End-Functionalized Poly(3-hexylthiophene) and the Effect of Fluorinated End Groups on Solar Cell Performance
摘要:
A series of well-defined perfluoroalkyl end-functionalized poly(3-hexylthiophenes) (P3HT) were synthesized by Stifle coupling of stannylated 2-perfluoralkylthiophene with the bromine end of P3HT. The length of the perfluoroalkyl end group was varied from -C4F13 to -C8F17. These polymers were fully characterized and tested in bulk heterojunction solar cells with phenyl-C-61-butyric acid methyl ester (PCBM) as the acceptor. Performance of the solar cells was highest for the unmodified P3HT and decreased as the length of the perfluoroalkyl end increased. The most affected device parameters were the short-circuit current density (J(sc)) and series resistance, pointing to lower charge carrier mobility and poor morphology as the cause for the lower performance. While the morphology of blends did not significantly change with perfluoroalkyl end modification, analysis of blended films by energy-filtered transmission electron microscopy (EF-TEM) revealed wider P3HT domains, consistent with the perfluorinated end groups segregating to the edge or exterior of P3HT domains, causing two domains to join. This study demonstrates that the perfluoroalkyl end group can be detrimental to polymer solar cell device performance, and further work toward understanding the interface between the donor and acceptor phases is required to fully understand this effect.
Synthesis of Perfluoroalkyl End-Functionalized Poly(3-hexylthiophene) and the Effect of Fluorinated End Groups on Solar Cell Performance
摘要:
A series of well-defined perfluoroalkyl end-functionalized poly(3-hexylthiophenes) (P3HT) were synthesized by Stifle coupling of stannylated 2-perfluoralkylthiophene with the bromine end of P3HT. The length of the perfluoroalkyl end group was varied from -C4F13 to -C8F17. These polymers were fully characterized and tested in bulk heterojunction solar cells with phenyl-C-61-butyric acid methyl ester (PCBM) as the acceptor. Performance of the solar cells was highest for the unmodified P3HT and decreased as the length of the perfluoroalkyl end increased. The most affected device parameters were the short-circuit current density (J(sc)) and series resistance, pointing to lower charge carrier mobility and poor morphology as the cause for the lower performance. While the morphology of blends did not significantly change with perfluoroalkyl end modification, analysis of blended films by energy-filtered transmission electron microscopy (EF-TEM) revealed wider P3HT domains, consistent with the perfluorinated end groups segregating to the edge or exterior of P3HT domains, causing two domains to join. This study demonstrates that the perfluoroalkyl end group can be detrimental to polymer solar cell device performance, and further work toward understanding the interface between the donor and acceptor phases is required to fully understand this effect.
Fluoroalkyl silanes are a class of compounds useful for various industrial purposes. For example, fluoroalkyl silanes which have hydrolysable groups (called hydrolysable fluoroalkyl silanes), are compounds useful as surface treatment agents which provide durable hydrophobic and oleophobic coatings. In general, hydrolysable fluoroalkyl silanes can be represented with the following formula: (RO—)
3
Si—R
T
wherein R is H or an alkyl; and R
T
is a monovalent organic compound terminated by a perfluoroalkyl group. When used to coat a surface, the (RO—)
3
moiety reacts (via hydrolysis) with various chemical groups of the surface (e.g., hydroxyl, amine, or other reactive groups) thereby bonding the fluoroalkyl silane to the surface The R
T
moiety comprises a divalent organic linking group which links the silicon atom to a terminal group rich in fluorine atoms whose unique electronic properties impart desirable hydrophobic and oleophobic properties in a surface coating. Modification of the R
T
moiety is useful in the engineering of fluoroalkyl silanes. The present invention provides for fluoroalkyl silanes having R
T
moieties which have not been heretofore considered.
PERFLUOROALKYLATION OF AROMATIC COMPOUNDS WITH R<sub>f</sub>I(Ph)OSO<sub>2</sub>CF<sub>3</sub>
作者:Teruo Umemoto、Yuriko Kuriu、Hideo Shuyama
DOI:10.1246/cl.1981.1663
日期:1981.12.5
Perfluoroalkylation of various aromaticcompounds with perfluoroalkylphenyliodonium trifluoromethanesulfonate (FITS) under mild conditions was described. The reactivity of other perfluoroalkyliodonium salts was also examined.
The present invention is directed to a fluorosilane represented by (L)
3
-Si—(CH
2
)
n
—(Z
1
)
a
—[C(X
1
)]
x
—(Z
2
)
l
-Q
1
-R
f
where each n is independently an integer from 1 to 12; L is independently chosen from a hydrolysable or non-hydrolysable monovalent group; R
f
is chosen from a C
2
-C
12
perfluoroalkyl provided that: i) one fluorine atom of the perfluoroalkyl can be optionally replaced by hydrogen, and/or ii) the perfluoroalkyl can be optionally interrupted by at least one oxygen, methylene, or ethylene; Q
1
is chosen from the group consisting of a C
2
-C
12
hydrocarbylene optionally interrupted by at least one divalent organic group; X
1
is chosen from O or S; —Z
2
is —NH— and Z
1
is from the group consisting of —O—, and —S—; each R
1
is independently chosen from hydrogen, phenyl, or a monovalent C
1
-C
8
alkyl optionally terminated by —C
6
H
5
, preferably H or CH
3
.
Resin for hydrophobilizing resist surface, method for production thereof, and positive resist composition containing the resin
申请人:Kanda Hiromi
公开号:US10678132B2
公开(公告)日:2020-06-09
A resin is to be added to a resist composition and localized on a surface of a resist film so as to hydrophobilize the surface of a resist film and has a peak area of a high molecular weight component having a molecular weight of 30,000 or more is 0.1% or less of a total peak area in a molecular weight distribution measured by gel permeation chromatography.