Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy

Ryan D. Pensack; Kyle M. Banyas; Larry W. Barbour; John B. Asbury

doi:10.1117/12.796100

Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy

Ryan D. Pensack
, Kyle M. Banyas
, Larry W. Barbour
, John B. Asbury

Pennsylvania State University

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The dynamics of photoinduced charge separation, recombination and trapping are examined in a polymer blend photovoltaic material with ultrafast visible pump - infrared probe and time-resolved infrared spectroscopy. The carbonyl (C=O) stretch of methanofullerene [6,6]-phenyl C₆₁-butyric acid methyl ester (PCBM) is probed as a local vibrational reporter of the dynamics in a blend with a poly(p-phenylenevinylene) (PPV) -based conjugated polymer, CN-MEH-PPV. Following interfacial electron transfer, geminate electron - hole pair dissociation occurs on ultrafast timescales. Subsequent to this charge separation process, charge carriers become trapped on the microsecond timescale resulting in the formation of a distinct peak in the vibrational spectra corresponding to the anion of PCBM. The charge trapping dynamics correspond to the carrier lifetime of similar PPV-based polymer blends as reported in photocurrent transients from the literature.

Original language	English
Title of host publication	Physical Chemistry of Interfaces and Nanomaterials VII
DOIs	https://doi.org/10.1117/12.796100
State	Published - 2008
Externally published	Yes
Event	Physical Chemistry of Interfaces and Nanomaterials VII - San Diego, CA, United States Duration: 11 Aug 2008 → 12 Aug 2008

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	7034
ISSN (Print)	0277-786X

Conference

Conference	Physical Chemistry of Interfaces and Nanomaterials VII
Country/Territory	United States
City	San Diego, CA
Period	11/08/08 → 12/08/08

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Bulk heterojunction
Charge recombination
Charge separation
Charge trapping
Conjugated polymer
Fullerene
Photovoltaic
Time-resolved infrared
Ultrafast vibrational spectroscopy

Access to Document

10.1117/12.796100

Cite this

Pensack, R. D., Banyas, K. M., Barbour, L. W., & Asbury, J. B. (2008). Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy. In Physical Chemistry of Interfaces and Nanomaterials VII Article 703404 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7034). https://doi.org/10.1117/12.796100

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title = "Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy",

abstract = "The dynamics of photoinduced charge separation, recombination and trapping are examined in a polymer blend photovoltaic material with ultrafast visible pump - infrared probe and time-resolved infrared spectroscopy. The carbonyl (C=O) stretch of methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) is probed as a local vibrational reporter of the dynamics in a blend with a poly(p-phenylenevinylene) (PPV) -based conjugated polymer, CN-MEH-PPV. Following interfacial electron transfer, geminate electron - hole pair dissociation occurs on ultrafast timescales. Subsequent to this charge separation process, charge carriers become trapped on the microsecond timescale resulting in the formation of a distinct peak in the vibrational spectra corresponding to the anion of PCBM. The charge trapping dynamics correspond to the carrier lifetime of similar PPV-based polymer blends as reported in photocurrent transients from the literature.",

keywords = "Bulk heterojunction, Charge recombination, Charge separation, Charge trapping, Conjugated polymer, Fullerene, Photovoltaic, Time-resolved infrared, Ultrafast vibrational spectroscopy",

author = "Pensack, \{Ryan D.\} and Banyas, \{Kyle M.\} and Barbour, \{Larry W.\} and Asbury, \{John B.\}",

year = "2008",

doi = "10.1117/12.796100",

language = "English",

isbn = "9780819472540",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

booktitle = "Physical Chemistry of Interfaces and Nanomaterials VII",

note = "Physical Chemistry of Interfaces and Nanomaterials VII ; Conference date: 11-08-2008 Through 12-08-2008",

}

Pensack, RD, Banyas, KM, Barbour, LW & Asbury, JB 2008, Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy. in Physical Chemistry of Interfaces and Nanomaterials VII., 703404, Proceedings of SPIE - The International Society for Optical Engineering, vol. 7034, Physical Chemistry of Interfaces and Nanomaterials VII, San Diego, CA, United States, 11/08/08. https://doi.org/10.1117/12.796100

Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy. / Pensack, Ryan D.; Banyas, Kyle M.; Barbour, Larry W. et al.
Physical Chemistry of Interfaces and Nanomaterials VII. 2008. 703404 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7034).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy

AU - Pensack, Ryan D.

AU - Banyas, Kyle M.

AU - Barbour, Larry W.

AU - Asbury, John B.

PY - 2008

Y1 - 2008

N2 - The dynamics of photoinduced charge separation, recombination and trapping are examined in a polymer blend photovoltaic material with ultrafast visible pump - infrared probe and time-resolved infrared spectroscopy. The carbonyl (C=O) stretch of methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) is probed as a local vibrational reporter of the dynamics in a blend with a poly(p-phenylenevinylene) (PPV) -based conjugated polymer, CN-MEH-PPV. Following interfacial electron transfer, geminate electron - hole pair dissociation occurs on ultrafast timescales. Subsequent to this charge separation process, charge carriers become trapped on the microsecond timescale resulting in the formation of a distinct peak in the vibrational spectra corresponding to the anion of PCBM. The charge trapping dynamics correspond to the carrier lifetime of similar PPV-based polymer blends as reported in photocurrent transients from the literature.

AB - The dynamics of photoinduced charge separation, recombination and trapping are examined in a polymer blend photovoltaic material with ultrafast visible pump - infrared probe and time-resolved infrared spectroscopy. The carbonyl (C=O) stretch of methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) is probed as a local vibrational reporter of the dynamics in a blend with a poly(p-phenylenevinylene) (PPV) -based conjugated polymer, CN-MEH-PPV. Following interfacial electron transfer, geminate electron - hole pair dissociation occurs on ultrafast timescales. Subsequent to this charge separation process, charge carriers become trapped on the microsecond timescale resulting in the formation of a distinct peak in the vibrational spectra corresponding to the anion of PCBM. The charge trapping dynamics correspond to the carrier lifetime of similar PPV-based polymer blends as reported in photocurrent transients from the literature.

KW - Bulk heterojunction

KW - Charge recombination

KW - Charge separation

KW - Charge trapping

KW - Conjugated polymer

KW - Fullerene

KW - Photovoltaic

KW - Time-resolved infrared

KW - Ultrafast vibrational spectroscopy

UR - https://www.scopus.com/pages/publications/56349133295

U2 - 10.1117/12.796100

DO - 10.1117/12.796100

M3 - Conference contribution

AN - SCOPUS:56349133295

SN - 9780819472540

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Physical Chemistry of Interfaces and Nanomaterials VII

T2 - Physical Chemistry of Interfaces and Nanomaterials VII

Y2 - 11 August 2008 through 12 August 2008

ER -

Interfacial charge separation and trapping in a photovoltaic polymer blend observed with ultrafast vibrational spectroscopy

Abstract

Publication series

Conference

UN SDGs

Keywords

Access to Document

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