Synthesis and applications of 2,7-carbazole-based conjugated main-chain copolymers containing electron deficient bithiazole units for organic solar cells

Dhananjaya Patra, Duryodhan Sahu, Harihara Padhy, Dhananjay Kekuda, Chih Wei Chu, Hong Cheu Lin

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

A series of low-band-gap (LBG) donor-accepor conjugated main-chain copolymers (P1-P4) containing planar 2,7-carbazole as electron donors and bithiazole units (4,4′-dihexyl-2,2′-bithiazole and 4,4′-dihexyl-5,5′-di(thiophen-2-yl)-2,2′-bithiazole) as electron acceptors were synthesized and studied for the applications in bulk heterojunction (BHJ) solar cells. The effects of electron deficient bithiazole units on the thermal, optical, electrochemical, and photovoltaic (PV) properties of these LBG copolymers were investigated. Absorption spectra revealed that polymers P1-P4 exhibited broad absorption bands in UV and visible regions from 300 to 600 nm with optical band gaps in the range of 1.93-1.99 eV, which overlapped with the major region of the solar emission spectrum. Moreover, carbazole-based polymers P1-P4 showed low values of the highest occupied molecular orbital (HOMO) levels, which provided good air stability and high open circuit voltages (Voc) in the PV applications. The BHJ PV devices were fabricated using polymers P1-P4 as electron donors and (6,6)-phenyl-C 61-butyric acid methyl ester (PC61BM) or (6,6)-phenyl-C71-butyric acid methyl ester (PC71BM) as electron acceptors in different weight ratios. The PV device bearing an active layer of polymer blend P4:PC71BM (1:1.5 w/w) showed the best power conversion efficiency value of 1.01% with a short circuit current density (Jsc) of 4.83 mA/cm2, a fill factor (FF) of 35%, and Voc = 0.60 V under 100 mW/cm2 of AM 1.5 white-light illumination.

Original languageEnglish
Pages (from-to)5479-5489
Number of pages11
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume48
Issue number23
DOIs
Publication statusPublished - 01-12-2010

Fingerprint

Copolymers
Butyric acid
Butyric Acid
Electrons
Esters
Polymers
Heterojunctions
Absorption spectra
Energy gap
Bearings (structural)
Optical band gaps
Molecular orbitals
Open circuit voltage
Polymer blends
Short circuit currents
Conversion efficiency
Solar cells
Current density
Lighting
carbazole

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Cite this

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title = "Synthesis and applications of 2,7-carbazole-based conjugated main-chain copolymers containing electron deficient bithiazole units for organic solar cells",
abstract = "A series of low-band-gap (LBG) donor-accepor conjugated main-chain copolymers (P1-P4) containing planar 2,7-carbazole as electron donors and bithiazole units (4,4′-dihexyl-2,2′-bithiazole and 4,4′-dihexyl-5,5′-di(thiophen-2-yl)-2,2′-bithiazole) as electron acceptors were synthesized and studied for the applications in bulk heterojunction (BHJ) solar cells. The effects of electron deficient bithiazole units on the thermal, optical, electrochemical, and photovoltaic (PV) properties of these LBG copolymers were investigated. Absorption spectra revealed that polymers P1-P4 exhibited broad absorption bands in UV and visible regions from 300 to 600 nm with optical band gaps in the range of 1.93-1.99 eV, which overlapped with the major region of the solar emission spectrum. Moreover, carbazole-based polymers P1-P4 showed low values of the highest occupied molecular orbital (HOMO) levels, which provided good air stability and high open circuit voltages (Voc) in the PV applications. The BHJ PV devices were fabricated using polymers P1-P4 as electron donors and (6,6)-phenyl-C 61-butyric acid methyl ester (PC61BM) or (6,6)-phenyl-C71-butyric acid methyl ester (PC71BM) as electron acceptors in different weight ratios. The PV device bearing an active layer of polymer blend P4:PC71BM (1:1.5 w/w) showed the best power conversion efficiency value of 1.01{\%} with a short circuit current density (Jsc) of 4.83 mA/cm2, a fill factor (FF) of 35{\%}, and Voc = 0.60 V under 100 mW/cm2 of AM 1.5 white-light illumination.",
author = "Dhananjaya Patra and Duryodhan Sahu and Harihara Padhy and Dhananjay Kekuda and Chu, {Chih Wei} and Lin, {Hong Cheu}",
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Synthesis and applications of 2,7-carbazole-based conjugated main-chain copolymers containing electron deficient bithiazole units for organic solar cells. / Patra, Dhananjaya; Sahu, Duryodhan; Padhy, Harihara; Kekuda, Dhananjay; Chu, Chih Wei; Lin, Hong Cheu.

In: Journal of Polymer Science, Part A: Polymer Chemistry, Vol. 48, No. 23, 01.12.2010, p. 5479-5489.

Research output: Contribution to journalArticle

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AU - Patra, Dhananjaya

AU - Sahu, Duryodhan

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AU - Chu, Chih Wei

AU - Lin, Hong Cheu

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