Surface recombination in organic solar cells: Intrinsic vs. doped active layer

Gulnur Akhtanova; Hryhorii P. Parkhomenko; Joachim Vollbrecht; Andrii I. Mostovyi; Nora Schopp; Viktor Brus

doi:10.1016/j.orgel.2024.107183

Surface recombination in organic solar cells: Intrinsic vs. doped active layer

Gulnur Akhtanova
, Hryhorii P. Parkhomenko
, Joachim Vollbrecht
, Andrii I. Mostovyi
, Nora Schopp
, Viktor Brus

Nazarbayev University
Leibniz University Hannover
First Solar, Inc.

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

11 Citations (Scopus)

Abstract

This study extends the analytical model of surface recombination in organic solar cells with an intrinsic active bulk-heterojunction layer. The key finding of the developed multi-mechanism recombination model accounting for the intrinsic active layer is that the slope of V_OC vs. ln(Light Intensity) cannot be lower than 1.0 kT/q even at the extremely high concentrations of surface traps. We revealed the difference in recombination-related parameters determined in the scope of the multi-mechanism recombination model for the doped or intrinsic active layer and highlighted the importance of identifying the doping level of the active layer material. This is demonstrated by a synergy of comprehensive simulation and experimental analysis of organic solar cells with donor: acceptor blends: (PM6:Y6, PTB7-Th:COTIC-4F, PTB7-Th:O-IDTBR and PTB7-Th:ITIC-4F).

Original language	English
Article number	107183
Journal	Organic Electronics
Volume	137
DOIs	https://doi.org/10.1016/j.orgel.2024.107183
Publication status	Published - Feb 2025

Keywords

Non-fullerene acceptors
Non-geminate recombination
Organic bulk heterojunction solar cells
Surface recombination

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Biomaterials
General Chemistry
Condensed Matter Physics
Materials Chemistry
Electrical and Electronic Engineering

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10.1016/j.orgel.2024.107183

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@article{886bb10ebd414d7f8b2fbe8dd1b015fd,

title = "Surface recombination in organic solar cells: Intrinsic vs. doped active layer",

abstract = "This study extends the analytical model of surface recombination in organic solar cells with an intrinsic active bulk-heterojunction layer. The key finding of the developed multi-mechanism recombination model accounting for the intrinsic active layer is that the slope of VOC vs. ln(Light Intensity) cannot be lower than 1.0 kT/q even at the extremely high concentrations of surface traps. We revealed the difference in recombination-related parameters determined in the scope of the multi-mechanism recombination model for the doped or intrinsic active layer and highlighted the importance of identifying the doping level of the active layer material. This is demonstrated by a synergy of comprehensive simulation and experimental analysis of organic solar cells with donor: acceptor blends: (PM6:Y6, PTB7-Th:COTIC-4F, PTB7-Th:O-IDTBR and PTB7-Th:ITIC-4F).",

keywords = "Non-fullerene acceptors, Non-geminate recombination, Organic bulk heterojunction solar cells, Surface recombination",

author = "Gulnur Akhtanova and Parkhomenko, \{Hryhorii P.\} and Joachim Vollbrecht and Mostovyi, \{Andrii I.\} and Nora Schopp and Viktor Brus",

note = "Publisher Copyright: {\textcopyright} 2024 Elsevier B.V.",

year = "2025",

month = feb,

doi = "10.1016/j.orgel.2024.107183",

language = "English",

volume = "137",

journal = "Organic Electronics",

issn = "1566-1199",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Surface recombination in organic solar cells

T2 - Intrinsic vs. doped active layer

AU - Akhtanova, Gulnur

AU - Parkhomenko, Hryhorii P.

AU - Vollbrecht, Joachim

AU - Mostovyi, Andrii I.

AU - Schopp, Nora

AU - Brus, Viktor

PY - 2025/2

Y1 - 2025/2

N2 - This study extends the analytical model of surface recombination in organic solar cells with an intrinsic active bulk-heterojunction layer. The key finding of the developed multi-mechanism recombination model accounting for the intrinsic active layer is that the slope of VOC vs. ln(Light Intensity) cannot be lower than 1.0 kT/q even at the extremely high concentrations of surface traps. We revealed the difference in recombination-related parameters determined in the scope of the multi-mechanism recombination model for the doped or intrinsic active layer and highlighted the importance of identifying the doping level of the active layer material. This is demonstrated by a synergy of comprehensive simulation and experimental analysis of organic solar cells with donor: acceptor blends: (PM6:Y6, PTB7-Th:COTIC-4F, PTB7-Th:O-IDTBR and PTB7-Th:ITIC-4F).

AB - This study extends the analytical model of surface recombination in organic solar cells with an intrinsic active bulk-heterojunction layer. The key finding of the developed multi-mechanism recombination model accounting for the intrinsic active layer is that the slope of VOC vs. ln(Light Intensity) cannot be lower than 1.0 kT/q even at the extremely high concentrations of surface traps. We revealed the difference in recombination-related parameters determined in the scope of the multi-mechanism recombination model for the doped or intrinsic active layer and highlighted the importance of identifying the doping level of the active layer material. This is demonstrated by a synergy of comprehensive simulation and experimental analysis of organic solar cells with donor: acceptor blends: (PM6:Y6, PTB7-Th:COTIC-4F, PTB7-Th:O-IDTBR and PTB7-Th:ITIC-4F).

KW - Non-fullerene acceptors

KW - Non-geminate recombination

KW - Organic bulk heterojunction solar cells

KW - Surface recombination

UR - https://www.scopus.com/pages/publications/85211115985

UR - https://www.scopus.com/pages/publications/85211115985#tab=citedBy

U2 - 10.1016/j.orgel.2024.107183

DO - 10.1016/j.orgel.2024.107183

M3 - Article

AN - SCOPUS:85211115985

SN - 1566-1199

VL - 137

JO - Organic Electronics

JF - Organic Electronics

M1 - 107183

ER -

Surface recombination in organic solar cells: Intrinsic vs. doped active layer

Abstract

Keywords

ASJC Scopus subject areas

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