Photo-physics of PTB7, PCBM and ICBA based ternary solar cells

Ramakant Sharma; Hyunwoo Lee; Vinay Gupta; Hoyeon Kim; Mahesh Kumar; Chhavi Sharma; Suresh Chand; Seunghyup Yoo; Dipti Gupta

doi:10.1016/j.orgel.2016.04.022

Photo-physics of PTB7, PCBM and ICBA based ternary solar cells

Ramakant Sharma, Hyunwoo Lee, Vinay Gupta, Hoyeon Kim, Mahesh Kumar, Chhavi Sharma, Suresh Chand, Seunghyup Yoo, Dipti Gupta

Physics

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

46 Scopus citations

Abstract

Indene-C₆₀bisadduct (ICBA) is one of the rare acceptors which can supersede commonly used phenyl-C71-butyric acid methyl ester (PCBM70) in enhancing the performance of bulk heterojunction (BHJ) solar cells owing to its shallower lowest unoccupied molecular orbital (LUMO) level. However, ICBA tends to decrease the photocurrent for most of the low band-gap polymers synthesized to date. Here we examine the interaction of ICBA with the one of the popular low band-gap polymers poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno[3,4-b]thiophenediyl]] (PTB7), at femtosecond level, to explore key dynamics governing the operation of BHJ cells involving ICBA. The photo-physics of binary and ternary systems based on PTB7 coupled with PCBM70 and/or ICBA are studied by means of transient absorption spectroscopy (TAS) and electrochemical impedance spectroscopy (EIS) and supported by morphology analysis. Our study suggests that both inefficient charge-separation and poor charge transport of ICBA is responsible for relatively low photocurrent generation.

Original language	British English
Pages (from-to)	111-117
Number of pages	7
Journal	Organic Electronics
Volume	34
DOIs	https://doi.org/10.1016/j.orgel.2016.04.022
State	Published - 1 Jul 2016

Keywords

Carrier concentration
Electrochemical impedance spectroscopy
ICBA
PCBM
PEIE
PTB7
Transient absorption spectroscopy
Trap

UN SDGs

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

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10.1016/j.orgel.2016.04.022

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@article{01ab00f0f74948d98600cfec1d0b9149,

title = "Photo-physics of PTB7, PCBM and ICBA based ternary solar cells",

abstract = "Indene-C60bisadduct (ICBA) is one of the rare acceptors which can supersede commonly used phenyl-C71-butyric acid methyl ester (PCBM70) in enhancing the performance of bulk heterojunction (BHJ) solar cells owing to its shallower lowest unoccupied molecular orbital (LUMO) level. However, ICBA tends to decrease the photocurrent for most of the low band-gap polymers synthesized to date. Here we examine the interaction of ICBA with the one of the popular low band-gap polymers poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno[3,4-b]thiophenediyl]] (PTB7), at femtosecond level, to explore key dynamics governing the operation of BHJ cells involving ICBA. The photo-physics of binary and ternary systems based on PTB7 coupled with PCBM70 and/or ICBA are studied by means of transient absorption spectroscopy (TAS) and electrochemical impedance spectroscopy (EIS) and supported by morphology analysis. Our study suggests that both inefficient charge-separation and poor charge transport of ICBA is responsible for relatively low photocurrent generation.",

keywords = "Carrier concentration, Electrochemical impedance spectroscopy, ICBA, PCBM, PEIE, PTB7, Transient absorption spectroscopy, Trap",

author = "Ramakant Sharma and Hyunwoo Lee and Vinay Gupta and Hoyeon Kim and Mahesh Kumar and Chhavi Sharma and Suresh Chand 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) DTD 03/07/2013 ), Indo-UK (APEX) program (Phase II), EEWS-2014-N01140052 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. The authors also thank National Nanofabrication Center at Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea, and DNPL, India for providing various facilities for device characterization. Publisher Copyright: {\textcopyright} 2016 Elsevier B.V. All rights reserved.",

year = "2016",

month = jul,

day = "1",

doi = "10.1016/j.orgel.2016.04.022",

language = "British English",

volume = "34",

pages = "111--117",

journal = "Organic Electronics",

issn = "1566-1199",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Photo-physics of PTB7, PCBM and ICBA based ternary solar cells

AU - Sharma, Ramakant

AU - Lee, Hyunwoo

AU - Gupta, Vinay

AU - Kim, Hoyeon

AU - Kumar, Mahesh

AU - Sharma, Chhavi

AU - Chand, Suresh

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) DTD 03/07/2013 ), Indo-UK (APEX) program (Phase II), EEWS-2014-N01140052 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. The authors also thank National Nanofabrication Center at Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea, and DNPL, India for providing various facilities for device characterization. Publisher Copyright: © 2016 Elsevier B.V. All rights reserved.

PY - 2016/7/1

Y1 - 2016/7/1

N2 - Indene-C60bisadduct (ICBA) is one of the rare acceptors which can supersede commonly used phenyl-C71-butyric acid methyl ester (PCBM70) in enhancing the performance of bulk heterojunction (BHJ) solar cells owing to its shallower lowest unoccupied molecular orbital (LUMO) level. However, ICBA tends to decrease the photocurrent for most of the low band-gap polymers synthesized to date. Here we examine the interaction of ICBA with the one of the popular low band-gap polymers poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno[3,4-b]thiophenediyl]] (PTB7), at femtosecond level, to explore key dynamics governing the operation of BHJ cells involving ICBA. The photo-physics of binary and ternary systems based on PTB7 coupled with PCBM70 and/or ICBA are studied by means of transient absorption spectroscopy (TAS) and electrochemical impedance spectroscopy (EIS) and supported by morphology analysis. Our study suggests that both inefficient charge-separation and poor charge transport of ICBA is responsible for relatively low photocurrent generation.

AB - Indene-C60bisadduct (ICBA) is one of the rare acceptors which can supersede commonly used phenyl-C71-butyric acid methyl ester (PCBM70) in enhancing the performance of bulk heterojunction (BHJ) solar cells owing to its shallower lowest unoccupied molecular orbital (LUMO) level. However, ICBA tends to decrease the photocurrent for most of the low band-gap polymers synthesized to date. Here we examine the interaction of ICBA with the one of the popular low band-gap polymers poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno[3,4-b]thiophenediyl]] (PTB7), at femtosecond level, to explore key dynamics governing the operation of BHJ cells involving ICBA. The photo-physics of binary and ternary systems based on PTB7 coupled with PCBM70 and/or ICBA are studied by means of transient absorption spectroscopy (TAS) and electrochemical impedance spectroscopy (EIS) and supported by morphology analysis. Our study suggests that both inefficient charge-separation and poor charge transport of ICBA is responsible for relatively low photocurrent generation.

KW - Carrier concentration

KW - Electrochemical impedance spectroscopy

KW - ICBA

KW - PCBM

KW - PEIE

KW - PTB7

KW - Transient absorption spectroscopy

KW - Trap

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U2 - 10.1016/j.orgel.2016.04.022

DO - 10.1016/j.orgel.2016.04.022

M3 - Article

AN - SCOPUS:84963830514

SN - 1566-1199

VL - 34

SP - 111

EP - 117

JO - Organic Electronics

JF - Organic Electronics

ER -

Photo-physics of PTB7, PCBM and ICBA based ternary solar cells

Abstract

Keywords

UN SDGs

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