Revealing the recombination dynamics in squaraine-based bulk heterojunction solar cells

Dorothea Scheunemann; Oliver Kolloge; Sebastian Wilken; Majvor Mack; Jürgen Parisi; Matthias Schulz; Arne Lützen; Manuela Schiek

doi:10.1063/1.4996080

Revealing the recombination dynamics in squaraine-based bulk heterojunction solar cells

Dorothea Scheunemann^*
, Oliver Kolloge
, Sebastian Wilken
, Majvor Mack
, Jürgen Parisi
, Matthias Schulz
, Arne Lützen
, Manuela Schiek

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

14 Citations (Scopus)

Abstract

We combine steady-state with transient optoelectronic characterization methods to understand the operation of photovoltaic devices based on a benchmark model squaraine blended with a fullerene acceptor. These devices suffer from a gradual decrease in the fill factor when increasing the active layer thickness and incident light intensity. Using transient photocurrent, transient photovoltage, and bias-assisted charge extraction measurements, we show that the fill factor deteriorates due to slow charge carrier collection competing with bimolecular recombination. Under normal operating conditions, we find a bimolecular recombination rate constant of ∼10^–17 m³ s⁻¹, which corresponds to a reduction of one to two orders of magnitude compared to the Langevin model.

Original language	English
Article number	183502
Journal	Applied Physics Letters
Volume	111
DOIs	https://doi.org/10.1063/1.4996080
Publication status	Published - 13 Oct 2017
Externally published	Yes
MoE publication type	A1 Journal article-refereed

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title = "Revealing the recombination dynamics in squaraine-based bulk heterojunction solar cells",

abstract = "We combine steady-state with transient optoelectronic characterization methods to understand the operation of photovoltaic devices based on a benchmark model squaraine blended with a fullerene acceptor. These devices suffer from a gradual decrease in the fill factor when increasing the active layer thickness and incident light intensity. Using transient photocurrent, transient photovoltage, and bias-assisted charge extraction measurements, we show that the fill factor deteriorates due to slow charge carrier collection competing with bimolecular recombination. Under normal operating conditions, we find a bimolecular recombination rate constant of ∼10–17 m3 s−1, which corresponds to a reduction of one to two orders of magnitude compared to the Langevin model.",

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T1 - Revealing the recombination dynamics in squaraine-based bulk heterojunction solar cells

AU - Scheunemann, Dorothea

AU - Kolloge, Oliver

AU - Wilken, Sebastian

AU - Mack, Majvor

AU - Parisi, Jürgen

AU - Schulz, Matthias

AU - Lützen, Arne

AU - Schiek, Manuela

PY - 2017/10/13

Y1 - 2017/10/13

N2 - We combine steady-state with transient optoelectronic characterization methods to understand the operation of photovoltaic devices based on a benchmark model squaraine blended with a fullerene acceptor. These devices suffer from a gradual decrease in the fill factor when increasing the active layer thickness and incident light intensity. Using transient photocurrent, transient photovoltage, and bias-assisted charge extraction measurements, we show that the fill factor deteriorates due to slow charge carrier collection competing with bimolecular recombination. Under normal operating conditions, we find a bimolecular recombination rate constant of ∼10–17 m3 s−1, which corresponds to a reduction of one to two orders of magnitude compared to the Langevin model.

AB - We combine steady-state with transient optoelectronic characterization methods to understand the operation of photovoltaic devices based on a benchmark model squaraine blended with a fullerene acceptor. These devices suffer from a gradual decrease in the fill factor when increasing the active layer thickness and incident light intensity. Using transient photocurrent, transient photovoltage, and bias-assisted charge extraction measurements, we show that the fill factor deteriorates due to slow charge carrier collection competing with bimolecular recombination. Under normal operating conditions, we find a bimolecular recombination rate constant of ∼10–17 m3 s−1, which corresponds to a reduction of one to two orders of magnitude compared to the Langevin model.

U2 - 10.1063/1.4996080

DO - 10.1063/1.4996080

M3 - Article

SN - 0003-6951

VL - 111

JO - Applied Physics Letters

JF - Applied Physics Letters

M1 - 183502

ER -

Revealing the recombination dynamics in squaraine-based bulk heterojunction solar cells

Abstract

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