Modeling geminate pair dissociation in organic solar cells

High power conversion efficiencies achieved with moderate optical bandgaps

Jonathan D. Servaites, Brett M. Savoie, Joseph B. Brink, Tobin J Marks, Mark A Ratner

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

We propose a model for geminate electron-hole dissociation in organic photovoltaic (OPV) cells and show how power conversion efficiencies greater than those currently achieved might be realized via design strategies employing moderate optical bandgaps and enhanced charge delocalization near the donor-acceptor interface. Applying this model to describing geminate electron-hole dissociation via charge transfer (CT) states, we find good agreement with recently published high-efficiency experimental data. The optimal bandgap for current-generation organic active layer materials is argued to be ∼1.7 eV - significantly greater than in previous analyses, including the Shockley-Queisser approach based upon non-excitonic solar cell dynamics. For future higher efficiency OPVs, the present results show that the optimal bandgap should be slightly lower, ∼1.6 eV. Finally, these results support design strategies aimed at enhancing mobility near the donor-acceptor interface and reducing the electron-hole binding energy, rather than striving to further reduce the bandgap.

Original languageEnglish
Pages (from-to)8343-8350
Number of pages8
JournalEnergy and Environmental Science
Volume5
Issue number8
DOIs
Publication statusPublished - 2012

Fingerprint

Optical band gaps
Conversion efficiency
Energy gap
electron
Electrons
modeling
Photovoltaic cells
active layer
Binding energy
Charge transfer
Solar cells
energy
Organic solar cells
solar cell

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Renewable Energy, Sustainability and the Environment
  • Environmental Chemistry
  • Pollution

Cite this

Modeling geminate pair dissociation in organic solar cells : High power conversion efficiencies achieved with moderate optical bandgaps. / Servaites, Jonathan D.; Savoie, Brett M.; Brink, Joseph B.; Marks, Tobin J; Ratner, Mark A.

In: Energy and Environmental Science, Vol. 5, No. 8, 2012, p. 8343-8350.

Research output: Contribution to journalArticle

@article{67a61d98ffa14c33b6624f19f518a7e8,
title = "Modeling geminate pair dissociation in organic solar cells: High power conversion efficiencies achieved with moderate optical bandgaps",
abstract = "We propose a model for geminate electron-hole dissociation in organic photovoltaic (OPV) cells and show how power conversion efficiencies greater than those currently achieved might be realized via design strategies employing moderate optical bandgaps and enhanced charge delocalization near the donor-acceptor interface. Applying this model to describing geminate electron-hole dissociation via charge transfer (CT) states, we find good agreement with recently published high-efficiency experimental data. The optimal bandgap for current-generation organic active layer materials is argued to be ∼1.7 eV - significantly greater than in previous analyses, including the Shockley-Queisser approach based upon non-excitonic solar cell dynamics. For future higher efficiency OPVs, the present results show that the optimal bandgap should be slightly lower, ∼1.6 eV. Finally, these results support design strategies aimed at enhancing mobility near the donor-acceptor interface and reducing the electron-hole binding energy, rather than striving to further reduce the bandgap.",
author = "Servaites, {Jonathan D.} and Savoie, {Brett M.} and Brink, {Joseph B.} and Marks, {Tobin J} and Ratner, {Mark A}",
year = "2012",
doi = "10.1039/c2ee21376a",
language = "English",
volume = "5",
pages = "8343--8350",
journal = "Energy and Environmental Science",
issn = "1754-5692",
publisher = "Royal Society of Chemistry",
number = "8",

}

TY - JOUR

T1 - Modeling geminate pair dissociation in organic solar cells

T2 - High power conversion efficiencies achieved with moderate optical bandgaps

AU - Servaites, Jonathan D.

AU - Savoie, Brett M.

AU - Brink, Joseph B.

AU - Marks, Tobin J

AU - Ratner, Mark A

PY - 2012

Y1 - 2012

N2 - We propose a model for geminate electron-hole dissociation in organic photovoltaic (OPV) cells and show how power conversion efficiencies greater than those currently achieved might be realized via design strategies employing moderate optical bandgaps and enhanced charge delocalization near the donor-acceptor interface. Applying this model to describing geminate electron-hole dissociation via charge transfer (CT) states, we find good agreement with recently published high-efficiency experimental data. The optimal bandgap for current-generation organic active layer materials is argued to be ∼1.7 eV - significantly greater than in previous analyses, including the Shockley-Queisser approach based upon non-excitonic solar cell dynamics. For future higher efficiency OPVs, the present results show that the optimal bandgap should be slightly lower, ∼1.6 eV. Finally, these results support design strategies aimed at enhancing mobility near the donor-acceptor interface and reducing the electron-hole binding energy, rather than striving to further reduce the bandgap.

AB - We propose a model for geminate electron-hole dissociation in organic photovoltaic (OPV) cells and show how power conversion efficiencies greater than those currently achieved might be realized via design strategies employing moderate optical bandgaps and enhanced charge delocalization near the donor-acceptor interface. Applying this model to describing geminate electron-hole dissociation via charge transfer (CT) states, we find good agreement with recently published high-efficiency experimental data. The optimal bandgap for current-generation organic active layer materials is argued to be ∼1.7 eV - significantly greater than in previous analyses, including the Shockley-Queisser approach based upon non-excitonic solar cell dynamics. For future higher efficiency OPVs, the present results show that the optimal bandgap should be slightly lower, ∼1.6 eV. Finally, these results support design strategies aimed at enhancing mobility near the donor-acceptor interface and reducing the electron-hole binding energy, rather than striving to further reduce the bandgap.

UR - http://www.scopus.com/inward/record.url?scp=84864269910&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84864269910&partnerID=8YFLogxK

U2 - 10.1039/c2ee21376a

DO - 10.1039/c2ee21376a

M3 - Article

VL - 5

SP - 8343

EP - 8350

JO - Energy and Environmental Science

JF - Energy and Environmental Science

SN - 1754-5692

IS - 8

ER -