Origin of the open-circuit voltage in small-molecular organic photovoltaic devices: Effects of deposition rate control of donor material

Chih Chien Lee, Wen Chang Chang, Wei Cheng Su, Bo Yao Huang, Chun Feng Lin, Shun Wei Liu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Small-molecular organic photovoltaic devices with different open-circuit voltage (VOC) were fabricated by simply controlling the deposition rate of donor material. Higher VOC was obtained when the donor deposited at a higher rate and vice versa. The origin of the improved VOC was studied by means of morphological change and temperature-dependent current density-voltage characteristics. The presence of pinholes as shown in atomic force microscopic images indicated the strong molecular interaction at the lower donor deposition rate, resulting in the severe leakage current from acceptor to anode as observed in the dark current. Equivalent circuit model and temperature-dependent dark currents were utilized to realize the effect of reverse saturation current on VOC. The higher barrier height at the donor-acceptor interface was attributed to the improved VOC for the device with higher donor deposition rate.

Original languageEnglish
Pages (from-to)03CD01
JournalJapanese Journal of Applied Physics
Volume54
Issue number3
DOIs
Publication statusPublished - Mar 1 2015
Externally publishedYes

Fingerprint

donor materials
volatile organic compounds
Open circuit voltage
Deposition rates
open circuit voltage
Volatile organic compounds
Dark currents
dark current
Molecular interactions
pinholes
molecular interactions
equivalent circuits
Leakage currents
Equivalent circuits
Anodes
anodes
leakage
Current density
current density
saturation

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Origin of the open-circuit voltage in small-molecular organic photovoltaic devices : Effects of deposition rate control of donor material. / Lee, Chih Chien; Chang, Wen Chang; Su, Wei Cheng; Huang, Bo Yao; Lin, Chun Feng; Liu, Shun Wei.

In: Japanese Journal of Applied Physics, Vol. 54, No. 3, 01.03.2015, p. 03CD01.

Research output: Contribution to journalArticle

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