Dark carrier dynamics and electrical characteristics of organic solar cells integrated with Ag-SiO2 core-shell nanoparticles

Kah H. Chan, Naveen K. Elumalai, Murad J. Y. Tayebjee, Ashraf Uddin, Supriya Pillai

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Short circuit current increase in organic solar cells due to increased light absorption, mediated by metal nanoparticles is widely reported, but the underlying influence of changes in electrical properties of dark carriers and trap states in organic solar cells is not well explored. In this work, Ag-SiO2 core-shell nanoparticles in an optimized blend with ZnO sol-gel was used to improve device performance of PCPDTBT:PC70BM based organic solar cells and allowed direct examination of the electrical properties while isolating optical effects. Impedance spectroscopy revealed dopant-induced dark carriers from impurities in the active layer or surface trap states. The modified ZnO devices containing dopant-induced dark carriers exhibited enhanced carrier mobility and reduced lifetime compared to reference devices. We attribute the reduced dark carrier lifetime to short-lived and shallow trap states that reduce monomolecular recombination under illuminated operating conditions, thereby improving charge extraction efficiency. A combination of changes in dark carrier dynamics and improvements in electrical properties was responsible for the improved fill factor and efficiency of devices with Ag-SiO2 core-shell nanoparticles.

LanguageEnglish
Pages34-42
Number of pages9
JournalSynthetic Metals
Volume223
DOIs
Publication statusPublished - Jan 2017
Externally publishedYes

Fingerprint

Electric properties
solar cells
Nanoparticles
nanoparticles
electrical properties
traps
Doping (additives)
Carrier lifetime
Metal nanoparticles
Carrier mobility
Short circuit currents
Light absorption
Sol-gels
short circuit currents
carrier lifetime
electromagnetic absorption
carrier mobility
Spectroscopy
Impurities
examination

Keywords

  • Plasmonics
  • Impedance
  • Organic photovoltaics
  • Dark carrier

Cite this

Chan, Kah H. ; Elumalai, Naveen K. ; Tayebjee, Murad J. Y. ; Uddin, Ashraf ; Pillai, Supriya. / Dark carrier dynamics and electrical characteristics of organic solar cells integrated with Ag-SiO2 core-shell nanoparticles. In: Synthetic Metals. 2017 ; Vol. 223. pp. 34-42.
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abstract = "Short circuit current increase in organic solar cells due to increased light absorption, mediated by metal nanoparticles is widely reported, but the underlying influence of changes in electrical properties of dark carriers and trap states in organic solar cells is not well explored. In this work, Ag-SiO2 core-shell nanoparticles in an optimized blend with ZnO sol-gel was used to improve device performance of PCPDTBT:PC70BM based organic solar cells and allowed direct examination of the electrical properties while isolating optical effects. Impedance spectroscopy revealed dopant-induced dark carriers from impurities in the active layer or surface trap states. The modified ZnO devices containing dopant-induced dark carriers exhibited enhanced carrier mobility and reduced lifetime compared to reference devices. We attribute the reduced dark carrier lifetime to short-lived and shallow trap states that reduce monomolecular recombination under illuminated operating conditions, thereby improving charge extraction efficiency. A combination of changes in dark carrier dynamics and improvements in electrical properties was responsible for the improved fill factor and efficiency of devices with Ag-SiO2 core-shell nanoparticles.",
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Dark carrier dynamics and electrical characteristics of organic solar cells integrated with Ag-SiO2 core-shell nanoparticles. / Chan, Kah H.; Elumalai, Naveen K.; Tayebjee, Murad J. Y.; Uddin, Ashraf; Pillai, Supriya.

In: Synthetic Metals, Vol. 223, 01.2017, p. 34-42.

Research output: Contribution to journalArticleResearchpeer-review

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