Correlation between exciton lifetime distribution and morphology of bulk heterojunction films after solvent annealing

Jen Hsien Huang, Kuang Chieh Li, Fan Ching Chien, Yu Sheng Hsiao, Dhananjay Kekuda, Peilin Chen, Hong Cheu Lin, Kuo Chuan Ho, Chih Wei Chu

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

We have synthesized a low-bandgap polymer, bithiazole-based polymer (PCPDTTBT) containing cyclopentadithiophene and thiophene units, and studied its opticophysical properties and morphologies in bulk heterojunction films after annealing. We used confocal optical microscopy in conjunction with a fluorescence module to record exciton lifetime images within photoactive layers of PCPDTTBT and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). These images, which were consistent with those recorded using atomic force microscopy and transmission electron microscopy, revealed that phase separation of PCPDTTBT and PCBM occurred during slow solvent evaporation. This phase separation not only provided bicontinuous pathways for carrier transport to the respective electrodes but also enhanced the degree of polymer chain stacking, thereby improving the absorption and balancing the electron and hole mobilities. We tested the performance of solar cells incorporating PCPDTTBT and various fullerene derivatives. Under AM 1.5 G illumination (100 mW cm-2), a PCPDTTBT/bisPCBM-based solar cell exhibited a power conversion efficiency of 3.8%, with a short circuit current of 7.3 mA cm-2, an open circuit voltage of 0.88 V, and a fill factor of 59.1%.

Original languageEnglish
Pages (from-to)9062-9069
Number of pages8
JournalJournal of Physical Chemistry C
Volume114
Issue number19
DOIs
Publication statusPublished - 20-05-2010

Fingerprint

Excitons
Heterojunctions
heterojunctions
Polymers
Butyric acid
butyric acid
excitons
Annealing
Phase separation
life (durability)
annealing
esters
Solar cells
Esters
polymers
solar cells
Fullerenes
Thiophenes
Hole mobility
Butyric Acid

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

Cite this

Huang, Jen Hsien ; Li, Kuang Chieh ; Chien, Fan Ching ; Hsiao, Yu Sheng ; Kekuda, Dhananjay ; Chen, Peilin ; Lin, Hong Cheu ; Ho, Kuo Chuan ; Chu, Chih Wei. / Correlation between exciton lifetime distribution and morphology of bulk heterojunction films after solvent annealing. In: Journal of Physical Chemistry C. 2010 ; Vol. 114, No. 19. pp. 9062-9069.
@article{e7f5b638a9344616a190969e224406c2,
title = "Correlation between exciton lifetime distribution and morphology of bulk heterojunction films after solvent annealing",
abstract = "We have synthesized a low-bandgap polymer, bithiazole-based polymer (PCPDTTBT) containing cyclopentadithiophene and thiophene units, and studied its opticophysical properties and morphologies in bulk heterojunction films after annealing. We used confocal optical microscopy in conjunction with a fluorescence module to record exciton lifetime images within photoactive layers of PCPDTTBT and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). These images, which were consistent with those recorded using atomic force microscopy and transmission electron microscopy, revealed that phase separation of PCPDTTBT and PCBM occurred during slow solvent evaporation. This phase separation not only provided bicontinuous pathways for carrier transport to the respective electrodes but also enhanced the degree of polymer chain stacking, thereby improving the absorption and balancing the electron and hole mobilities. We tested the performance of solar cells incorporating PCPDTTBT and various fullerene derivatives. Under AM 1.5 G illumination (100 mW cm-2), a PCPDTTBT/bisPCBM-based solar cell exhibited a power conversion efficiency of 3.8{\%}, with a short circuit current of 7.3 mA cm-2, an open circuit voltage of 0.88 V, and a fill factor of 59.1{\%}.",
author = "Huang, {Jen Hsien} and Li, {Kuang Chieh} and Chien, {Fan Ching} and Hsiao, {Yu Sheng} and Dhananjay Kekuda and Peilin Chen and Lin, {Hong Cheu} and Ho, {Kuo Chuan} and Chu, {Chih Wei}",
year = "2010",
month = "5",
day = "20",
doi = "10.1021/jp9120639",
language = "English",
volume = "114",
pages = "9062--9069",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "19",

}

Correlation between exciton lifetime distribution and morphology of bulk heterojunction films after solvent annealing. / Huang, Jen Hsien; Li, Kuang Chieh; Chien, Fan Ching; Hsiao, Yu Sheng; Kekuda, Dhananjay; Chen, Peilin; Lin, Hong Cheu; Ho, Kuo Chuan; Chu, Chih Wei.

In: Journal of Physical Chemistry C, Vol. 114, No. 19, 20.05.2010, p. 9062-9069.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Correlation between exciton lifetime distribution and morphology of bulk heterojunction films after solvent annealing

AU - Huang, Jen Hsien

AU - Li, Kuang Chieh

AU - Chien, Fan Ching

AU - Hsiao, Yu Sheng

AU - Kekuda, Dhananjay

AU - Chen, Peilin

AU - Lin, Hong Cheu

AU - Ho, Kuo Chuan

AU - Chu, Chih Wei

PY - 2010/5/20

Y1 - 2010/5/20

N2 - We have synthesized a low-bandgap polymer, bithiazole-based polymer (PCPDTTBT) containing cyclopentadithiophene and thiophene units, and studied its opticophysical properties and morphologies in bulk heterojunction films after annealing. We used confocal optical microscopy in conjunction with a fluorescence module to record exciton lifetime images within photoactive layers of PCPDTTBT and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). These images, which were consistent with those recorded using atomic force microscopy and transmission electron microscopy, revealed that phase separation of PCPDTTBT and PCBM occurred during slow solvent evaporation. This phase separation not only provided bicontinuous pathways for carrier transport to the respective electrodes but also enhanced the degree of polymer chain stacking, thereby improving the absorption and balancing the electron and hole mobilities. We tested the performance of solar cells incorporating PCPDTTBT and various fullerene derivatives. Under AM 1.5 G illumination (100 mW cm-2), a PCPDTTBT/bisPCBM-based solar cell exhibited a power conversion efficiency of 3.8%, with a short circuit current of 7.3 mA cm-2, an open circuit voltage of 0.88 V, and a fill factor of 59.1%.

AB - We have synthesized a low-bandgap polymer, bithiazole-based polymer (PCPDTTBT) containing cyclopentadithiophene and thiophene units, and studied its opticophysical properties and morphologies in bulk heterojunction films after annealing. We used confocal optical microscopy in conjunction with a fluorescence module to record exciton lifetime images within photoactive layers of PCPDTTBT and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). These images, which were consistent with those recorded using atomic force microscopy and transmission electron microscopy, revealed that phase separation of PCPDTTBT and PCBM occurred during slow solvent evaporation. This phase separation not only provided bicontinuous pathways for carrier transport to the respective electrodes but also enhanced the degree of polymer chain stacking, thereby improving the absorption and balancing the electron and hole mobilities. We tested the performance of solar cells incorporating PCPDTTBT and various fullerene derivatives. Under AM 1.5 G illumination (100 mW cm-2), a PCPDTTBT/bisPCBM-based solar cell exhibited a power conversion efficiency of 3.8%, with a short circuit current of 7.3 mA cm-2, an open circuit voltage of 0.88 V, and a fill factor of 59.1%.

UR - http://www.scopus.com/inward/record.url?scp=77952351285&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77952351285&partnerID=8YFLogxK

U2 - 10.1021/jp9120639

DO - 10.1021/jp9120639

M3 - Article

AN - SCOPUS:77952351285

VL - 114

SP - 9062

EP - 9069

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 19

ER -