Understanding Energy Level Alignment in PCDTBT:PC70BM Solar Cells

Erin L. Ratcliff; Andres Garcia; Sarah R. Cowan; Jens Meyer; K. Xerses Steirer; Sergio A. Paniagua; Anthony Giordano; Seth Marder; Neal R. Armstrong; Antoine Kahn; David Ginley; Dana C. Olson

doi:10.1109/PVSC.2012.6318295

Understanding Energy Level Alignment in PCDTBT:PC70BM Solar Cells

Erin L. Ratcliff, Andres Garcia, Sarah R. Cowan, Jens Meyer, K. Xerses Steirer, Sergio A. Paniagua, Anthony Giordano, Seth Marder, Neal R. Armstrong, Antoine Kahn, David Ginley, Dana C. Olson

Materials, Chemical, and Computational Science

Research output: Contribution to conference › Paper › peer-review

Abstract

Blended heterojunctions continue to improve in overall efficiency, with current power conversion efficiencies (PCE) at >7%, with interfaces being a dominating factor in improving PCE. Charge separation is dictated by energetic alignment between the donor and acceptor. Selective interlayers are used to preferentially harvest one charge via either thermodynamic or kinetic pathways. Energetic level alignment between the blend and the charge collection interfaces can impact the open circuit voltage (V_OC) through both loss mechanisms and poor choice of interlayers can result in less than ideal charge collection efficiencies. Here we report on the surface work function characterization of interlayers and phosphonic acid modifiers using ultraviolet photoelectron spectroscopy and the measured energetic level alignment between the interlayers and PCDTBT:PC₇₀BM BHJs. We will address the overall charge extraction from the bulk heterojunction of PCDTBT:PC₇₀BM and subsequent impact on V_OC, J_SC, and PCE.

Original language	American English
Pages	3377-3379
Number of pages	3
DOIs	https://doi.org/10.1109/PVSC.2012.6318295 https://doi.org/10.1109/PVSC.2012.6318295
State	Published - 2012
Event	38th IEEE Photovoltaic Specialists Conference, PVSC 2012 - Austin, TX, United States Duration: 3 Jun 2012 → 8 Jun 2012

Conference

Conference	38th IEEE Photovoltaic Specialists Conference, PVSC 2012
Country/Territory	United States
City	Austin, TX
Period	3/06/12 → 8/06/12

NREL Publication Number

NREL/CP-5200-57532

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Ratcliff, E. L., Garcia, A., Cowan, S. R., Meyer, J., Steirer, K. X., Paniagua, S. A., Giordano, A., Marder, S., Armstrong, N. R., Kahn, A., Ginley, D., & Olson, D. C. (2012). Understanding Energy Level Alignment in PCDTBT:PC70BM Solar Cells. 3377-3379. Paper presented at 38th IEEE Photovoltaic Specialists Conference, PVSC 2012, Austin, TX, United States. https://doi.org/10.1109/PVSC.2012.6318295, https://doi.org/10.1109/PVSC.2012.6318295

@conference{8e754b073d4641249ca98724086d3d9d,

title = "Understanding Energy Level Alignment in PCDTBT:PC70BM Solar Cells",

abstract = "Blended heterojunctions continue to improve in overall efficiency, with current power conversion efficiencies (PCE) at >7%, with interfaces being a dominating factor in improving PCE. Charge separation is dictated by energetic alignment between the donor and acceptor. Selective interlayers are used to preferentially harvest one charge via either thermodynamic or kinetic pathways. Energetic level alignment between the blend and the charge collection interfaces can impact the open circuit voltage (VOC) through both loss mechanisms and poor choice of interlayers can result in less than ideal charge collection efficiencies. Here we report on the surface work function characterization of interlayers and phosphonic acid modifiers using ultraviolet photoelectron spectroscopy and the measured energetic level alignment between the interlayers and PCDTBT:PC70BM BHJs. We will address the overall charge extraction from the bulk heterojunction of PCDTBT:PC70BM and subsequent impact on VOC, JSC, and PCE.",

author = "Ratcliff, {Erin L.} and Andres Garcia and Cowan, {Sarah R.} and Jens Meyer and Steirer, {K. Xerses} and Paniagua, {Sergio A.} and Anthony Giordano and Seth Marder and Armstrong, {Neal R.} and Antoine Kahn and David Ginley and Olson, {Dana C.}",

year = "2012",

doi = "10.1109/PVSC.2012.6318295",

language = "American English",

pages = "3377--3379",

note = "38th IEEE Photovoltaic Specialists Conference, PVSC 2012 ; Conference date: 03-06-2012 Through 08-06-2012",

}

Ratcliff, EL, Garcia, A, Cowan, SR, Meyer, J, Steirer, KX, Paniagua, SA, Giordano, A, Marder, S, Armstrong, NR, Kahn, A, Ginley, D & Olson, DC 2012, 'Understanding Energy Level Alignment in PCDTBT:PC70BM Solar Cells', Paper presented at 38th IEEE Photovoltaic Specialists Conference, PVSC 2012, Austin, TX, United States, 3/06/12 - 8/06/12 pp. 3377-3379. https://doi.org/10.1109/PVSC.2012.6318295, https://doi.org/10.1109/PVSC.2012.6318295

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T1 - Understanding Energy Level Alignment in PCDTBT:PC70BM Solar Cells

AU - Ratcliff, Erin L.

AU - Garcia, Andres

AU - Cowan, Sarah R.

AU - Meyer, Jens

AU - Steirer, K. Xerses

AU - Paniagua, Sergio A.

AU - Giordano, Anthony

AU - Marder, Seth

AU - Armstrong, Neal R.

AU - Kahn, Antoine

AU - Ginley, David

AU - Olson, Dana C.

PY - 2012

Y1 - 2012

N2 - Blended heterojunctions continue to improve in overall efficiency, with current power conversion efficiencies (PCE) at >7%, with interfaces being a dominating factor in improving PCE. Charge separation is dictated by energetic alignment between the donor and acceptor. Selective interlayers are used to preferentially harvest one charge via either thermodynamic or kinetic pathways. Energetic level alignment between the blend and the charge collection interfaces can impact the open circuit voltage (VOC) through both loss mechanisms and poor choice of interlayers can result in less than ideal charge collection efficiencies. Here we report on the surface work function characterization of interlayers and phosphonic acid modifiers using ultraviolet photoelectron spectroscopy and the measured energetic level alignment between the interlayers and PCDTBT:PC70BM BHJs. We will address the overall charge extraction from the bulk heterojunction of PCDTBT:PC70BM and subsequent impact on VOC, JSC, and PCE.

AB - Blended heterojunctions continue to improve in overall efficiency, with current power conversion efficiencies (PCE) at >7%, with interfaces being a dominating factor in improving PCE. Charge separation is dictated by energetic alignment between the donor and acceptor. Selective interlayers are used to preferentially harvest one charge via either thermodynamic or kinetic pathways. Energetic level alignment between the blend and the charge collection interfaces can impact the open circuit voltage (VOC) through both loss mechanisms and poor choice of interlayers can result in less than ideal charge collection efficiencies. Here we report on the surface work function characterization of interlayers and phosphonic acid modifiers using ultraviolet photoelectron spectroscopy and the measured energetic level alignment between the interlayers and PCDTBT:PC70BM BHJs. We will address the overall charge extraction from the bulk heterojunction of PCDTBT:PC70BM and subsequent impact on VOC, JSC, and PCE.

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T2 - 38th IEEE Photovoltaic Specialists Conference, PVSC 2012

Y2 - 3 June 2012 through 8 June 2012

ER -

Understanding Energy Level Alignment in PCDTBT:PC70BM Solar Cells

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