Sharma, Ramakant and Gupta, Vinay and Lee, Hyunwoo and Borse, Kunal and Datt, Ram and Sharma, Chhavi and Kumar, Mahesh and Yoo, Seunghyup and Gupta, Dipti (2018) Charge carrier dynamics in PffBT4T-2OD: PCBM organic solar cells. Organic Electronics, 62. pp. 441-447. ISSN 1566-1199

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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%).

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Subjects: Materials Science
Applied Physics/Condensed Matter
Depositing User: Mr. Yogesh Joshi
Date Deposited: 31 Jan 2020 11:07
Last Modified: 31 Jan 2020 11:07

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