Charge carrier dynamics in PffBT4T-2OD: PCBM organic solar cells

Ramakant Sharma; Vinay Gupta; Hyunwoo Lee; Kunal Borse; Ram Datt; Chhavi Sharma; Mahesh Kumar; Seunghyup Yoo; Dipti Gupta

doi:10.1016/j.orgel.2018.08.018

Charge carrier dynamics in PffBT4T-2OD: PCBM organic solar cells

Ramakant Sharma
, Vinay Gupta
, Hyunwoo Lee
, Kunal Borse
, Ram Datt
, Chhavi Sharma
, Mahesh Kumar
, Seunghyup Yoo
, Dipti Gupta

Physics

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

16 Scopus citations

Abstract

We investigate the charge carrier dynamics of inverted organic solar cells (OSCs) based on PffBT4T-2OD: PCBM and PTB7: PCBM – the two leading systems among the OSCs based on polymer-fullerene bulk-heterojunction – to elucidate the origin of their performance difference. Transient absorption spectroscopy (TAS) and photo-electrochemical impedance spectroscopy (photo-EIS) were employed to unravel the photo-physics that govern the cell operation of these two highly efficient bulk heterojunction OSCs. While photo-EIS indicates that the two systems under study exhibit similar behavior in terms of recombination, TAS results reveal that PffBT4T-2OD: PCBM systems not only have higher charge generation rate but also more efficient charge transfer than PTB7: PCBM systems, leading to the power conversion efficiency of PffBT4T-2OD: PCBM-based OSCs (9.16%) that is higher than that of PTB7: PCBM-based OSCs (6.44%).

Original language	British English
Pages (from-to)	441-447
Number of pages	7
Journal	Organic Electronics
Volume	62
DOIs	https://doi.org/10.1016/j.orgel.2018.08.018
State	Published - Nov 2018

UN SDGs

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

SDG 7 Affordable and Clean Energy

Keywords

Electrochemical impedance spectroscopy
Organic solar cells
PCBM
PCBM
PffBT4T-2OD
PTB7
Transient absorption spectroscopy

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@article{475a4b20f5bc450fb22a798c7a666888,

title = "Charge carrier dynamics in PffBT4T-2OD: PCBM organic solar cells",

abstract = "We investigate the charge carrier dynamics of inverted organic solar cells (OSCs) based on PffBT4T-2OD: PCBM and PTB7: PCBM – the two leading systems among the OSCs based on polymer-fullerene bulk-heterojunction – to elucidate the origin of their performance difference. Transient absorption spectroscopy (TAS) and photo-electrochemical impedance spectroscopy (photo-EIS) were employed to unravel the photo-physics that govern the cell operation of these two highly efficient bulk heterojunction OSCs. While photo-EIS indicates that the two systems under study exhibit similar behavior in terms of recombination, TAS results reveal that PffBT4T-2OD: PCBM systems not only have higher charge generation rate but also more efficient charge transfer than PTB7: PCBM systems, leading to the power conversion efficiency of PffBT4T-2OD: PCBM-based OSCs (9.16\%) that is higher than that of PTB7: PCBM-based OSCs (6.44\%).",

keywords = "Electrochemical impedance spectroscopy, Organic solar cells, PCBM, PCBM, PffBT4T-2OD, PTB7, Transient absorption spectroscopy",

author = "Ramakant Sharma and Vinay Gupta and Hyunwoo Lee and Kunal Borse and Ram Datt and Chhavi Sharma and Mahesh Kumar and Seunghyup Yoo and Dipti Gupta",

note = "Funding Information: The authors would like to acknowledge Solar Energy Research Initiative (SERI) program (Grant No. DST/TM/SERI/2k12/21(G) DTD03/07/2013 ), Indo-UK (APEX) program (Phase II), EEWS-2014-N01140 052 from Climate Change Research Hub Project of the KAIST EEWS Research Center (EEWS: Energy, Environment, Water and Sustainability) and Indo Korea Research Internship (IKRI) program (Order No. INT/ROK/IKRI-15/2014 ) of Department of Science and Technology (DST), India. This work was supported by the New \& Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea (No. 20163010012200 ). The authors also thank National Nanofabrication Center at Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea for providing various facilities for device characterization. RD thanks the UGC for the Junior Research Fellowship. Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

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doi = "10.1016/j.orgel.2018.08.018",

language = "British English",

volume = "62",

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journal = "Organic Electronics",

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T2 - PCBM organic solar cells

AU - Sharma, Ramakant

AU - Gupta, Vinay

AU - Lee, Hyunwoo

AU - Borse, Kunal

AU - Datt, Ram

AU - Sharma, Chhavi

AU - Kumar, Mahesh

AU - Yoo, Seunghyup

AU - Gupta, Dipti

N1 - Funding Information: The authors would like to acknowledge Solar Energy Research Initiative (SERI) program (Grant No. DST/TM/SERI/2k12/21(G) DTD03/07/2013 ), Indo-UK (APEX) program (Phase II), EEWS-2014-N01140 052 from Climate Change Research Hub Project of the KAIST EEWS Research Center (EEWS: Energy, Environment, Water and Sustainability) and Indo Korea Research Internship (IKRI) program (Order No. INT/ROK/IKRI-15/2014 ) of Department of Science and Technology (DST), India. This work was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea (No. 20163010012200 ). The authors also thank National Nanofabrication Center at Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea for providing various facilities for device characterization. RD thanks the UGC for the Junior Research Fellowship. Publisher Copyright: © 2018 Elsevier B.V.

PY - 2018/11

Y1 - 2018/11

N2 - We investigate the charge carrier dynamics of inverted organic solar cells (OSCs) based on PffBT4T-2OD: PCBM and PTB7: PCBM – the two leading systems among the OSCs based on polymer-fullerene bulk-heterojunction – to elucidate the origin of their performance difference. Transient absorption spectroscopy (TAS) and photo-electrochemical impedance spectroscopy (photo-EIS) were employed to unravel the photo-physics that govern the cell operation of these two highly efficient bulk heterojunction OSCs. While photo-EIS indicates that the two systems under study exhibit similar behavior in terms of recombination, TAS results reveal that PffBT4T-2OD: PCBM systems not only have higher charge generation rate but also more efficient charge transfer than PTB7: PCBM systems, leading to the power conversion efficiency of PffBT4T-2OD: PCBM-based OSCs (9.16%) that is higher than that of PTB7: PCBM-based OSCs (6.44%).

AB - We investigate the charge carrier dynamics of inverted organic solar cells (OSCs) based on PffBT4T-2OD: PCBM and PTB7: PCBM – the two leading systems among the OSCs based on polymer-fullerene bulk-heterojunction – to elucidate the origin of their performance difference. Transient absorption spectroscopy (TAS) and photo-electrochemical impedance spectroscopy (photo-EIS) were employed to unravel the photo-physics that govern the cell operation of these two highly efficient bulk heterojunction OSCs. While photo-EIS indicates that the two systems under study exhibit similar behavior in terms of recombination, TAS results reveal that PffBT4T-2OD: PCBM systems not only have higher charge generation rate but also more efficient charge transfer than PTB7: PCBM systems, leading to the power conversion efficiency of PffBT4T-2OD: PCBM-based OSCs (9.16%) that is higher than that of PTB7: PCBM-based OSCs (6.44%).

KW - Electrochemical impedance spectroscopy

KW - Organic solar cells

KW - PCBM

KW - PffBT4T-2OD

KW - PTB7

KW - Transient absorption spectroscopy

UR - https://www.scopus.com/pages/publications/85053205813

U2 - 10.1016/j.orgel.2018.08.018

DO - 10.1016/j.orgel.2018.08.018

M3 - Article

AN - SCOPUS:85053205813

SN - 1566-1199

VL - 62

SP - 441

EP - 447

JO - Organic Electronics

JF - Organic Electronics

ER -

Charge carrier dynamics in PffBT4T-2OD: PCBM organic solar cells

Abstract

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Keywords

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