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Simultaneous enhancement of light absorption and improved charge collection in PTB7-Th: PC70BM organic solar cells

Published online by Cambridge University Press:  06 March 2017

Kunal Borse ,
Ramakant Sharma ,
Dipti Gupta  and
Aswani Yella
Kunal Borse
Affiliation:
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai- 400076, India
Ramakant Sharma
Affiliation:
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai- 400076, India
Dipti Gupta*
Affiliation:
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai- 400076, India
Aswani Yella*
Affiliation:
Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai- 400076, India
*
*Corresponding Author E-mail: diptig@iitb.ac.in (D.G), aswani.yella@iitb.ac.in (A.Y)
*Corresponding Author E-mail: diptig@iitb.ac.in (D.G), aswani.yella@iitb.ac.in (A.Y)
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Abstract

Enhancing the light absorption and improving the charge collection are considered as two major prerequisite for achieving highly efficient bulk heterojunction organic solar cells (BHJ OSCs). In the present study, we have explored Ga doped ZnO as an electron transport layer for improving the charge collection in one of the promising donor: acceptor system comprised of Poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b’]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] (PTB7-Th):phenyl-C71-butyric acid methyl ester (PC70BM). With the inverted geometry having a configuration of ITO/GZO (40nm)/PTB7-Th: PC70BM (100nm)/MoO3 (10nm)/Ag (100nm), maximum power conversion efficiency (PCE) of 7.24% has been achieved, while it is limited at 6.89% for devices with undoped ZnO.It was found that PCE can be further improved to 8.35 % after V-grooved textured PDMS films were attached to the backside of OSC substrates. We attribute this performance enhancement in OSCs is due to increased total optical path length of the incident light within the device.

Keywords

energy generationoptoelectronicsol-gel
Type
Articles
Information
MRS Advances , Volume 2 , Issue 15: Nanomaterials , 2017 , pp. 835 - 840
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

1

Kunal Borse and Ramakant Sharma contributed equally to this work.

References

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