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Title: Polymer defect states modulate open-circuit voltage in bulk-heterojunction solar cells

Abstract

Defect states influence the operation of organic solar cells altering transport, recombination, and energetic mechanisms. This work investigates how processing conditions induce morphology-related, electrically active defects in the donor polymer of bulk-heterojunction solar cells. Structural order is inferred from absorption and X-ray diffraction data, while defect density is determined from capacitance methods. A correlation is observed between the polymer nanocrystallite size, the defect concentration, and the output voltage. For the case of poly(3-hexylthiophene), processing that promote crystallinity is beneficial for the device performance as it decreases the defect density (energy disorder) that finally enlarges the maximum achievable open-circuit voltage. Defect states within the effective bandgap modulate the downshift of the hole Fermi level upon illumination that in turn establishes the achievable open-circuit voltage.

Authors:
; ;  [1]
  1. Photovoltaic and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, ES-12071 Castelló (Spain)
Publication Date:
OSTI Identifier:
22253784
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 24; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; CAPACITANCE; DENSITY; ELECTRIC POTENTIAL; FERMI LEVEL; HETEROJUNCTIONS; ORGANIC SOLAR CELLS; POLYMERS; X-RAY DIFFRACTION

Citation Formats

Ripolles, Teresa S., Guerrero, Antonio, and Garcia-Belmonte, Germà, E-mail: garciag@uji.es. Polymer defect states modulate open-circuit voltage in bulk-heterojunction solar cells. United States: N. p., 2013. Web. doi:10.1063/1.4841475.
Ripolles, Teresa S., Guerrero, Antonio, & Garcia-Belmonte, Germà, E-mail: garciag@uji.es. Polymer defect states modulate open-circuit voltage in bulk-heterojunction solar cells. United States. doi:10.1063/1.4841475.
Ripolles, Teresa S., Guerrero, Antonio, and Garcia-Belmonte, Germà, E-mail: garciag@uji.es. 2013. "Polymer defect states modulate open-circuit voltage in bulk-heterojunction solar cells". United States. doi:10.1063/1.4841475.
@article{osti_22253784,
title = {Polymer defect states modulate open-circuit voltage in bulk-heterojunction solar cells},
author = {Ripolles, Teresa S. and Guerrero, Antonio and Garcia-Belmonte, Germà, E-mail: garciag@uji.es},
abstractNote = {Defect states influence the operation of organic solar cells altering transport, recombination, and energetic mechanisms. This work investigates how processing conditions induce morphology-related, electrically active defects in the donor polymer of bulk-heterojunction solar cells. Structural order is inferred from absorption and X-ray diffraction data, while defect density is determined from capacitance methods. A correlation is observed between the polymer nanocrystallite size, the defect concentration, and the output voltage. For the case of poly(3-hexylthiophene), processing that promote crystallinity is beneficial for the device performance as it decreases the defect density (energy disorder) that finally enlarges the maximum achievable open-circuit voltage. Defect states within the effective bandgap modulate the downshift of the hole Fermi level upon illumination that in turn establishes the achievable open-circuit voltage.},
doi = {10.1063/1.4841475},
journal = {Applied Physics Letters},
number = 24,
volume = 103,
place = {United States},
year = 2013,
month =
}