Understanding the correlation between energy-state mismatching and open-circuit voltage loss in bulk heterojunction solar cells

Hyun Seock Yang; Danbi Kim; Chang Mok Oh; Vellaiappillai Tamilavan; Pesi M. Hangoma; Hojun Yi; Bo R. Lee; Insoo Shin; In Wook Hwang; Sung Heum Park

doi:10.1002/cey2.433

Understanding the correlation between energy-state mismatching and open-circuit voltage loss in bulk heterojunction solar cells

Hyun Seock Yang
, Danbi Kim
, Chang Mok Oh
, Vellaiappillai Tamilavan
, Pesi M. Hangoma
, Hojun Yi
, Bo R. Lee
, Insoo Shin
, In Wook Hwang
, Sung Heum Park

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

4 Scopus citations

Abstract

Photoinduced intermolecular charge transfer (PICT) determines the voltage loss in bulk heterojunction (BHJ) organic photovoltaics (OPVs), and this voltage loss can be minimized by inducing efficient PICT, which requires energy-state matching between the donor and acceptor at the BHJ interfaces. Thus, both geometrically and energetically accessible delocalized state matching at the hot energy level is crucial for achieving efficient PICT. In this study, an effective method for quantifying the hot state matching of OPVs was developed. The degree of energy-state matching between the electron donor and acceptor at BHJ interfaces was quantified using a mismatching factor (MF) calculated from the modified optical density of the BHJ. Furthermore, the correlation between the open-circuit voltage (V_oc) of the OPV device and energy-state matching at the BHJ interface was investigated using the calculated MF. The OPVs with small absolute MF values exhibited high V_oc values. This result clearly indicates that the energy-state matching between the donor and acceptor is crucial for achieving a high V_oc in OPVs. Because the MF indicates the degree of energy-state matching, which is a critical factor for suppressing energy loss, it can be used to estimate the V_oc loss in OPVs.

Original language	English
Article number	e433
Journal	Carbon Energy
Volume	6
Issue number	5
DOIs	https://doi.org/10.1002/cey2.433
State	Published - May 2024
Externally published	Yes

Keywords

bulk heterojunction
open circuit voltage
organic photovoltaics
photoinduced charge transfer
voltage loss

UN SDGs

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

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10.1002/cey2.433

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title = "Understanding the correlation between energy-state mismatching and open-circuit voltage loss in bulk heterojunction solar cells",

abstract = "Photoinduced intermolecular charge transfer (PICT) determines the voltage loss in bulk heterojunction (BHJ) organic photovoltaics (OPVs), and this voltage loss can be minimized by inducing efficient PICT, which requires energy-state matching between the donor and acceptor at the BHJ interfaces. Thus, both geometrically and energetically accessible delocalized state matching at the hot energy level is crucial for achieving efficient PICT. In this study, an effective method for quantifying the hot state matching of OPVs was developed. The degree of energy-state matching between the electron donor and acceptor at BHJ interfaces was quantified using a mismatching factor (MF) calculated from the modified optical density of the BHJ. Furthermore, the correlation between the open-circuit voltage (Voc) of the OPV device and energy-state matching at the BHJ interface was investigated using the calculated MF. The OPVs with small absolute MF values exhibited high Voc values. This result clearly indicates that the energy-state matching between the donor and acceptor is crucial for achieving a high Voc in OPVs. Because the MF indicates the degree of energy-state matching, which is a critical factor for suppressing energy loss, it can be used to estimate the Voc loss in OPVs.",

keywords = "bulk heterojunction, open circuit voltage, organic photovoltaics, photoinduced charge transfer, voltage loss",

author = "Yang, \{Hyun Seock\} and Danbi Kim and Oh, \{Chang Mok\} and Vellaiappillai Tamilavan and Hangoma, \{Pesi M.\} and Hojun Yi and Lee, \{Bo R.\} and Insoo Shin and Hwang, \{In Wook\} and Park, \{Sung Heum\}",

note = "Publisher Copyright: {\textcopyright} 2024 The Authors. Carbon Energy published by Wenzhou University and John Wiley \& Sons Australia, Ltd.",

year = "2024",

month = may,

doi = "10.1002/cey2.433",

language = "English",

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journal = "Carbon Energy",

issn = "2637-9368",

publisher = "John Wiley \& Sons Inc.",

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TY - JOUR

T1 - Understanding the correlation between energy-state mismatching and open-circuit voltage loss in bulk heterojunction solar cells

AU - Yang, Hyun Seock

AU - Kim, Danbi

AU - Oh, Chang Mok

AU - Tamilavan, Vellaiappillai

AU - Hangoma, Pesi M.

AU - Yi, Hojun

AU - Lee, Bo R.

AU - Shin, Insoo

AU - Hwang, In Wook

AU - Park, Sung Heum

PY - 2024/5

Y1 - 2024/5

N2 - Photoinduced intermolecular charge transfer (PICT) determines the voltage loss in bulk heterojunction (BHJ) organic photovoltaics (OPVs), and this voltage loss can be minimized by inducing efficient PICT, which requires energy-state matching between the donor and acceptor at the BHJ interfaces. Thus, both geometrically and energetically accessible delocalized state matching at the hot energy level is crucial for achieving efficient PICT. In this study, an effective method for quantifying the hot state matching of OPVs was developed. The degree of energy-state matching between the electron donor and acceptor at BHJ interfaces was quantified using a mismatching factor (MF) calculated from the modified optical density of the BHJ. Furthermore, the correlation between the open-circuit voltage (Voc) of the OPV device and energy-state matching at the BHJ interface was investigated using the calculated MF. The OPVs with small absolute MF values exhibited high Voc values. This result clearly indicates that the energy-state matching between the donor and acceptor is crucial for achieving a high Voc in OPVs. Because the MF indicates the degree of energy-state matching, which is a critical factor for suppressing energy loss, it can be used to estimate the Voc loss in OPVs.

AB - Photoinduced intermolecular charge transfer (PICT) determines the voltage loss in bulk heterojunction (BHJ) organic photovoltaics (OPVs), and this voltage loss can be minimized by inducing efficient PICT, which requires energy-state matching between the donor and acceptor at the BHJ interfaces. Thus, both geometrically and energetically accessible delocalized state matching at the hot energy level is crucial for achieving efficient PICT. In this study, an effective method for quantifying the hot state matching of OPVs was developed. The degree of energy-state matching between the electron donor and acceptor at BHJ interfaces was quantified using a mismatching factor (MF) calculated from the modified optical density of the BHJ. Furthermore, the correlation between the open-circuit voltage (Voc) of the OPV device and energy-state matching at the BHJ interface was investigated using the calculated MF. The OPVs with small absolute MF values exhibited high Voc values. This result clearly indicates that the energy-state matching between the donor and acceptor is crucial for achieving a high Voc in OPVs. Because the MF indicates the degree of energy-state matching, which is a critical factor for suppressing energy loss, it can be used to estimate the Voc loss in OPVs.

KW - bulk heterojunction

KW - open circuit voltage

KW - organic photovoltaics

KW - photoinduced charge transfer

KW - voltage loss

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DO - 10.1002/cey2.433

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JF - Carbon Energy

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ER -

Understanding the correlation between energy-state mismatching and open-circuit voltage loss in bulk heterojunction solar cells

Abstract

Keywords

UN SDGs

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