Effect of substituted side chain on donor-acceptor conjugated copolymers
- 29 December 2008
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 93 (26), 263301
- https://doi.org/10.1063/1.3059554
Abstract
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.Keywords
This publication has 20 references indexed in Scilit:
- Two Novel Cyclopentadithiophene-Based Alternating Copolymers as Potential Donor Components for High-Efficiency Bulk-Heterojunction-Type Solar CellsChemistry of Materials, 2008
- High-performance polymer heterojunction solar cells of a polysilafluorene derivativeApplied Physics Letters, 2008
- Toward a Rational Design of Poly(2,7-Carbazole) Derivatives for Solar CellsJournal of the American Chemical Society, 2007
- A New Donor–Acceptor–Donor Polyfluorene Copolymer with Balanced Electron and Hole MobilityAdvanced Functional Materials, 2007
- A New Poly(2,7‐Dibenzosilole) Derivative in Polymer Solar CellsMacromolecular Rapid Communications, 2007
- Molecular Engineering of the Band Gap of π‐Conjugated Systems: Facing Technological ApplicationsMacromolecular Rapid Communications, 2007
- A Low‐Bandgap Poly(2,7‐Carbazole) Derivative for Use in High‐Performance Solar CellsAdvanced Materials, 2007
- Conjugated Donor−Acceptor Copolymer Semiconductors with Large Intramolecular Charge Transfer: Synthesis, Optical Properties, Electrochemistry, and Field Effect Carrier Mobility of Thienopyrazine-Based CopolymersMacromolecules, 2006
- Design Rules for Donors in Bulk‐Heterojunction Solar Cells—Towards 10 % Energy‐Conversion EfficiencyAdvanced Materials, 2006
- High‐Performance Polymer Solar Cells of an Alternating Polyfluorene Copolymer and a Fullerene DerivativeAdvanced Materials, 2003