Effect of substituted side chain on donor-acceptor conjugated copolymers

被引：72

作者：

Cho, Shinuk ^{[1
]}

Seo, Jung Hwa ^{[1
]}

Kim, Sun Hee ^{[2
]}

Song, Suhee ^{[3
]}

Jin, Youngeup ^{[3
]}

Lee, Kwanghee ^{[2
]}

Suh, Hongsuk ^{[3
]}

Heeger, Alan J. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA

[2] Gwangju Inst Sci & Technol, Dept Mat Sci & Engn, Kwangju, South Korea

[3] Pusan Natl Univ, Dept Chem, Pusan 609735, South Korea

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 26期

关键词：

conducting polymers; energy gap; hole mobility; infrared spectra; polymer blends; red shift; ultraviolet spectra; visible spectra;

D O I：

10.1063/1.3059554

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effects of substitute side chain (alkyl or alkoxy) on optical and electrical properties of low-band-gap conjugated copolymers were investigated using poly(2,7-dihydroindeno[2,1-a]indene-co-4,7-di-2-thienyl-2,1,3-benzothiadiazole), poly(2,7-dihydroindeno[2,1-a]indene-co-4,7-bis(4-hexyl-2-thienyl)-2,1,3-benzothiadiazole) (PININE-DHTBT), and poly(2,7-dihydroindeno[2,1-a]indene-co-4,7-bis[3-(hexyloxy)-2-thienyl]-2,1,3-benzothiadiazole) (PININE-DHOTBT). Alkyl introduced PININE-DHTBT exhibits blueshifted absorption spectrum, while alkoxy introduced PININE-DHOTBT exhibits redshifted absorption spectrum. Because of steric hindrance of alkyl or alkoxy side chain, highest occupied molecular orbitals of PININE-DHTBT and PININE-DHOTBT highly localized on donor segments, thereby decreasing hole mobilities of PININE-DHTBT and PININE-DHOTBT. Consequently, despite the spectral advantage of PININE-DHOTBT for photovoltaic cells, the actual solar cell property of PININE-DHOTBT was not enhanced.

引用

页数：3

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