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Title: In situ measurement of power conversion efficiency and molecular ordering during thermal annealing in P3HT:PCBM bulk heterojunction solar cells

Abstract

Bulk heterojunction organic solar cells hold much promise as commercially viable sources of renewable energy due to their relatively inexpensive fabrication. Developing a fundamental knowledge of how processing conditions influence solar power conversion efficiency will enable rational and efficient design, optimization, and control of new organic solar cell materials. In this report, we use a combination of in situ current–voltage measurements and grazing-incidence wide-angle X-ray scattering experiments at elevated temperature to correlate the changes in photoconversion efficiency to the changes in the molecular ordering of a poly(3-hexylthiophene):[6,6]-phenyl-C₆₁-butyric acid methyl ester (P3HT:PCBM) bulk heterojunction active layer. In situ measurements of current–voltage characteristics were used to optimize the power conversion efficiency and the resulting thermal processing was in agreement with studies from repeated heating and cooling cycles. The improvements in short circuit current with thermal annealing were correlated to an increase in the population of face-on oriented crystallites of P3HT rather than improvements in molecular ordering of PCBM.

Authors:
 [1];  [2];  [3];  [4];  [1]
  1. Univ. of California, Santa Barbara, CA (United States). Materials Dept. and Materials Research Lab.
  2. Univ. of California, Santa Barbara, CA (United States). Materials Dept.
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  4. Univ. of California, Santa Barbara, CA (United States). Depts. of Chemistry and Biochemistry, Materials and Materials Research Lab.
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC); Center for Energy Efficient Materials (CEEM)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1065763
DOE Contract Number:  
SC0001009
Resource Type:
Journal Article
Journal Name:
Journal of Materials Chemistry
Additional Journal Information:
Journal Volume: 21; Journal Issue: 39; Related Information: CEEM partners with the University of California, Santa Barbara (lead); Purdue University; Los Alamos National Laboratory; National Renewable Energy Laboratory; Journal ID: ISSN 0959-9428
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; solar (photovoltaic), solid state lighting, phonons, thermoelectric, bio-inspired, energy storage (including batteries and capacitors), electrodes - solar, defects, charge transport, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing)

Citation Formats

Treat, Neil D., Shuttle, Chris G., Toney, Michael F., Hawker, Craig J., and Chabinyc, Michael L. In situ measurement of power conversion efficiency and molecular ordering during thermal annealing in P3HT:PCBM bulk heterojunction solar cells. United States: N. p., 2011. Web. doi:10.1039/c1jm12677f.
Treat, Neil D., Shuttle, Chris G., Toney, Michael F., Hawker, Craig J., & Chabinyc, Michael L. In situ measurement of power conversion efficiency and molecular ordering during thermal annealing in P3HT:PCBM bulk heterojunction solar cells. United States. doi:10.1039/c1jm12677f.
Treat, Neil D., Shuttle, Chris G., Toney, Michael F., Hawker, Craig J., and Chabinyc, Michael L. Wed . "In situ measurement of power conversion efficiency and molecular ordering during thermal annealing in P3HT:PCBM bulk heterojunction solar cells". United States. doi:10.1039/c1jm12677f.
@article{osti_1065763,
title = {In situ measurement of power conversion efficiency and molecular ordering during thermal annealing in P3HT:PCBM bulk heterojunction solar cells},
author = {Treat, Neil D. and Shuttle, Chris G. and Toney, Michael F. and Hawker, Craig J. and Chabinyc, Michael L.},
abstractNote = {Bulk heterojunction organic solar cells hold much promise as commercially viable sources of renewable energy due to their relatively inexpensive fabrication. Developing a fundamental knowledge of how processing conditions influence solar power conversion efficiency will enable rational and efficient design, optimization, and control of new organic solar cell materials. In this report, we use a combination of in situ current–voltage measurements and grazing-incidence wide-angle X-ray scattering experiments at elevated temperature to correlate the changes in photoconversion efficiency to the changes in the molecular ordering of a poly(3-hexylthiophene):[6,6]-phenyl-C₆₁-butyric acid methyl ester (P3HT:PCBM) bulk heterojunction active layer. In situ measurements of current–voltage characteristics were used to optimize the power conversion efficiency and the resulting thermal processing was in agreement with studies from repeated heating and cooling cycles. The improvements in short circuit current with thermal annealing were correlated to an increase in the population of face-on oriented crystallites of P3HT rather than improvements in molecular ordering of PCBM.},
doi = {10.1039/c1jm12677f},
journal = {Journal of Materials Chemistry},
issn = {0959-9428},
number = 39,
volume = 21,
place = {United States},
year = {2011},
month = {8}
}