Sharma, Ramakant and Lee, Hyunwoo and Gupta, Vinay and Kim, Hoyeon and Kumar, Mahesh and Sharma, Chhavi and Chand, Suresh and Yoo, Seunghyup and Gupta, Dipti (2016) Photo-physics of PTB7, PCBM and ICBA based ternary solar cells. Organic Electronics, 34. pp. 111-117. ISSN 1566-1199

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Abstract

Indene-C(60)bisadduct (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]thio-phenediyl]] (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.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Uncontrolled Keywords:	PTB7 ICBA PCBM Electrochemical impedance spectroscopy Transient absorption spectroscopy PEIE Carrier concentration Trap
Subjects:	Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	12 Apr 2018 06:58
Last Modified:	12 Apr 2018 06:58
URI:	http://npl.csircentral.net/id/eprint/2325

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