Reducing Trap-Assisted Recombination in Small Organic Molecule-Based Photovoltaics by the Addition of a Conjugated Block Copolymer

Kyuwan Cho; Jinseck Kim; So Yeon Yoon; Ka Yeon Ryu; Song Rim Jang; Bogyu Lim; Kyungkon Kim

doi:10.1002/marc.201700630

Reducing Trap-Assisted Recombination in Small Organic Molecule-Based Photovoltaics by the Addition of a Conjugated Block Copolymer

Kyuwan Cho, Jinseck Kim, So Yeon Yoon, Ka Yeon Ryu, Song Rim Jang, Bogyu Lim, Kyungkon Kim

Chemistry & Nanoscience

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

15 Scopus citations

Abstract

The performance of organic photovoltaics (OPVs) based on the small-molecule organic semiconductor p-DTS(FBTTh₂)₂ is greatly improved by the addition of a conjugated block copolymer composed of difluoroquinoxaline and thienopyrrolodione blocks (D130). The power conversion efficiency (PCE) of the p-DTS(FBTTh₂)₂-based OPV is improved from 5.08% to 6.75% by the addition of 5 wt% D130 to the photoactive layer, which is composed of p-DTS(FBTTh₂)₂ and a fullerene derivative. Current–voltage and grazing incidence wide-angle X-ray scattering analyses revealed that the addition of D130 significantly reduces the trap density of the device and changes the packing orientation of p-DTS(FBTTh₂)₂ from mostly edge-on to partially face-on. These changes greatly improve the charge carrier mobility of the OPV, indicating that D130 is highly compatible with p-DTS(FBTTh₂)₂. Furthermore, the addition of D130 improve the photostability of the OPV by reducing the burn-in loss under a light soaking intensity of 1 sun. The D130-based OPV maintained 34% of its initial PCE after a light soaking test for 858 h. In contrast, the PCE of the OPV without D130 reduced to 14% of its initial efficiency in the same time period.

Original language	English
Article number	1700630
Journal	Macromolecular Rapid Communications
Volume	39
Issue number	5
DOIs	https://doi.org/10.1002/marc.201700630
State	Published - Mar 2018

Keywords

organic solar cell stability
organic solar cells
small molecule organic solar cells
ternary organic solar cells

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@article{57ef111a4ca64359b444ab0f8c8f863e,

title = "Reducing Trap-Assisted Recombination in Small Organic Molecule-Based Photovoltaics by the Addition of a Conjugated Block Copolymer",

abstract = "The performance of organic photovoltaics (OPVs) based on the small-molecule organic semiconductor p-DTS(FBTTh2)2 is greatly improved by the addition of a conjugated block copolymer composed of difluoroquinoxaline and thienopyrrolodione blocks (D130). The power conversion efficiency (PCE) of the p-DTS(FBTTh2)2-based OPV is improved from 5.08% to 6.75% by the addition of 5 wt% D130 to the photoactive layer, which is composed of p-DTS(FBTTh2)2 and a fullerene derivative. Current–voltage and grazing incidence wide-angle X-ray scattering analyses revealed that the addition of D130 significantly reduces the trap density of the device and changes the packing orientation of p-DTS(FBTTh2)2 from mostly edge-on to partially face-on. These changes greatly improve the charge carrier mobility of the OPV, indicating that D130 is highly compatible with p-DTS(FBTTh2)2. Furthermore, the addition of D130 improve the photostability of the OPV by reducing the burn-in loss under a light soaking intensity of 1 sun. The D130-based OPV maintained 34% of its initial PCE after a light soaking test for 858 h. In contrast, the PCE of the OPV without D130 reduced to 14% of its initial efficiency in the same time period.",

keywords = "organic solar cell stability, organic solar cells, small molecule organic solar cells, ternary organic solar cells",

author = "Kyuwan Cho and Jinseck Kim and Yoon, {So Yeon} and Ryu, {Ka Yeon} and Jang, {Song Rim} and Bogyu Lim and Kyungkon Kim",

note = "Funding Information: This research was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) under program number 20123010010140, and supported by the NRF under program numbers NRF-2015M1A2A2057506 and NRF-2016M1A2A2940914. Publisher Copyright: {\textcopyright} 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2018",

month = mar,

doi = "10.1002/marc.201700630",

language = "English",

volume = "39",

journal = "Macromolecular Rapid Communications",

issn = "1022-1336",

publisher = "Wiley-VCH Verlag",

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T1 - Reducing Trap-Assisted Recombination in Small Organic Molecule-Based Photovoltaics by the Addition of a Conjugated Block Copolymer

AU - Cho, Kyuwan

AU - Kim, Jinseck

AU - Yoon, So Yeon

AU - Ryu, Ka Yeon

AU - Jang, Song Rim

AU - Lim, Bogyu

AU - Kim, Kyungkon

N1 - Funding Information: This research was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) under program number 20123010010140, and supported by the NRF under program numbers NRF-2015M1A2A2057506 and NRF-2016M1A2A2940914. Publisher Copyright: © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2018/3

Y1 - 2018/3

N2 - The performance of organic photovoltaics (OPVs) based on the small-molecule organic semiconductor p-DTS(FBTTh2)2 is greatly improved by the addition of a conjugated block copolymer composed of difluoroquinoxaline and thienopyrrolodione blocks (D130). The power conversion efficiency (PCE) of the p-DTS(FBTTh2)2-based OPV is improved from 5.08% to 6.75% by the addition of 5 wt% D130 to the photoactive layer, which is composed of p-DTS(FBTTh2)2 and a fullerene derivative. Current–voltage and grazing incidence wide-angle X-ray scattering analyses revealed that the addition of D130 significantly reduces the trap density of the device and changes the packing orientation of p-DTS(FBTTh2)2 from mostly edge-on to partially face-on. These changes greatly improve the charge carrier mobility of the OPV, indicating that D130 is highly compatible with p-DTS(FBTTh2)2. Furthermore, the addition of D130 improve the photostability of the OPV by reducing the burn-in loss under a light soaking intensity of 1 sun. The D130-based OPV maintained 34% of its initial PCE after a light soaking test for 858 h. In contrast, the PCE of the OPV without D130 reduced to 14% of its initial efficiency in the same time period.

AB - The performance of organic photovoltaics (OPVs) based on the small-molecule organic semiconductor p-DTS(FBTTh2)2 is greatly improved by the addition of a conjugated block copolymer composed of difluoroquinoxaline and thienopyrrolodione blocks (D130). The power conversion efficiency (PCE) of the p-DTS(FBTTh2)2-based OPV is improved from 5.08% to 6.75% by the addition of 5 wt% D130 to the photoactive layer, which is composed of p-DTS(FBTTh2)2 and a fullerene derivative. Current–voltage and grazing incidence wide-angle X-ray scattering analyses revealed that the addition of D130 significantly reduces the trap density of the device and changes the packing orientation of p-DTS(FBTTh2)2 from mostly edge-on to partially face-on. These changes greatly improve the charge carrier mobility of the OPV, indicating that D130 is highly compatible with p-DTS(FBTTh2)2. Furthermore, the addition of D130 improve the photostability of the OPV by reducing the burn-in loss under a light soaking intensity of 1 sun. The D130-based OPV maintained 34% of its initial PCE after a light soaking test for 858 h. In contrast, the PCE of the OPV without D130 reduced to 14% of its initial efficiency in the same time period.

KW - organic solar cell stability

KW - organic solar cells

KW - small molecule organic solar cells

KW - ternary organic solar cells

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U2 - 10.1002/marc.201700630

DO - 10.1002/marc.201700630

M3 - Article

C2 - 29218755

AN - SCOPUS:85043280869

SN - 1022-1336

VL - 39

JO - Macromolecular Rapid Communications

JF - Macromolecular Rapid Communications

IS - 5

M1 - 1700630

ER -

Reducing Trap-Assisted Recombination in Small Organic Molecule-Based Photovoltaics by the Addition of a Conjugated Block Copolymer

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Keywords

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