Improving bulk heterojunction solar cells through controlling their nanostructure

Nichole C. Cates; George F. Burkhard; Roman Gysel; Zach Beiley; Eric T. Hoke; Shawn R. Scully; Chad E. Miller; Michael F. Toney; Martin Heeney; Iain McCulloch; Michael D. McGehee

Improving bulk heterojunction solar cells through controlling their nanostructure

Nichole C. Cates, George F. Burkhard, Roman Gysel, Zach Beiley, Eric T. Hoke, Shawn R. Scully, Chad E. Miller, Michael F. Toney, Martin Heeney, Iain McCulloch, Michael D. McGehee

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

Abstract

We investigated the internal quantum efficiencies (IQEs) of high efficiency P3HT:PCBM solar cells and found the IQEs to be wavelength dependent. Numerical modeling showed that this could be explained by the polymer and fullerene having unequal exciton harvesting efficiencies. We found that for these devices, the exciton diffusion length in PCBM is too small; excitons generated in PCBM decay before reaching the donor-acceptor interface. We also studied fullerene intercalation in the crystalline polymer pBTTT and the amorphous polymer MDMO-PPV. This work demonstrates that intercalation can be controlled by adjusting the fullerene size, clarifies the effect of intercalation on solar-cell properties and explains why intercalation may be responsible for the significant increase in the MDMO-PPV hole mobility when it is blended with PCBM.

Original language	English (US)
Title of host publication	ACS National Meeting Book of Abstracts
State	Published - Dec 1 2010
Externally published	Yes

Cite this

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title = "Improving bulk heterojunction solar cells through controlling their nanostructure",

abstract = "We investigated the internal quantum efficiencies (IQEs) of high efficiency P3HT:PCBM solar cells and found the IQEs to be wavelength dependent. Numerical modeling showed that this could be explained by the polymer and fullerene having unequal exciton harvesting efficiencies. We found that for these devices, the exciton diffusion length in PCBM is too small; excitons generated in PCBM decay before reaching the donor-acceptor interface. We also studied fullerene intercalation in the crystalline polymer pBTTT and the amorphous polymer MDMO-PPV. This work demonstrates that intercalation can be controlled by adjusting the fullerene size, clarifies the effect of intercalation on solar-cell properties and explains why intercalation may be responsible for the significant increase in the MDMO-PPV hole mobility when it is blended with PCBM.",

author = "Cates, {Nichole C.} and Burkhard, {George F.} and Roman Gysel and Zach Beiley and Hoke, {Eric T.} and Scully, {Shawn R.} and Miller, {Chad E.} and Toney, {Michael F.} and Martin Heeney and Iain McCulloch and McGehee, {Michael D.}",

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T1 - Improving bulk heterojunction solar cells through controlling their nanostructure

AU - Cates, Nichole C.

AU - Burkhard, George F.

AU - Gysel, Roman

AU - Beiley, Zach

AU - Hoke, Eric T.

AU - Scully, Shawn R.

AU - Miller, Chad E.

AU - Toney, Michael F.

AU - Heeney, Martin

AU - McCulloch, Iain

AU - McGehee, Michael D.

N1 - Generated from Scopus record by KAUST IRTS on 2023-02-14

PY - 2010/12/1

Y1 - 2010/12/1

N2 - We investigated the internal quantum efficiencies (IQEs) of high efficiency P3HT:PCBM solar cells and found the IQEs to be wavelength dependent. Numerical modeling showed that this could be explained by the polymer and fullerene having unequal exciton harvesting efficiencies. We found that for these devices, the exciton diffusion length in PCBM is too small; excitons generated in PCBM decay before reaching the donor-acceptor interface. We also studied fullerene intercalation in the crystalline polymer pBTTT and the amorphous polymer MDMO-PPV. This work demonstrates that intercalation can be controlled by adjusting the fullerene size, clarifies the effect of intercalation on solar-cell properties and explains why intercalation may be responsible for the significant increase in the MDMO-PPV hole mobility when it is blended with PCBM.

AB - We investigated the internal quantum efficiencies (IQEs) of high efficiency P3HT:PCBM solar cells and found the IQEs to be wavelength dependent. Numerical modeling showed that this could be explained by the polymer and fullerene having unequal exciton harvesting efficiencies. We found that for these devices, the exciton diffusion length in PCBM is too small; excitons generated in PCBM decay before reaching the donor-acceptor interface. We also studied fullerene intercalation in the crystalline polymer pBTTT and the amorphous polymer MDMO-PPV. This work demonstrates that intercalation can be controlled by adjusting the fullerene size, clarifies the effect of intercalation on solar-cell properties and explains why intercalation may be responsible for the significant increase in the MDMO-PPV hole mobility when it is blended with PCBM.

UR - http://www.scopus.com/inward/record.url?scp=79951491883&partnerID=8YFLogxK

M3 - Conference contribution

BT - ACS National Meeting Book of Abstracts

ER -

Improving bulk heterojunction solar cells through controlling their nanostructure

Abstract

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