Fullerene-free organic solar cells with an efficiency of 3.7% based on a low-cost geometrically planar perylene diimide monomer
Singh, R.; Aluicio-Sarduy, E.; Kan, Z.; Ye, T.; MacKenzie, R.C.I.; Keivanidis, P.E.
RODERICK MACKENZIE Roderick.Mackenzie@nottingham.ac.uk
The aggregate-induced limitation for high power-conversion efficiencies (PCEs) of perylene-diimide (PDI): polymer solar cells can be circumvented when two simple rules are respected; the aggregate size of PDI remains short enough and the omnipresent PDI aggregates are electronically interconnected. Following these guidelines, a PCE of 3.7% is delivered by using the solution-processable, planar PDI monomer of N,N’-bis(1-ethylpropyl)-perylene-3,4,9,10-tetracarboxylic diimide as the electron acceptor mixed with the low-energy gap polymeric donor poly[(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b;4,5-b’]dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-thieno[3,4-b]thiophene))-2,6-diyl] (PBDTTT-CT). The PBDTTT-CT:PDI composite absorbs strongly the light in the region of 400 nm–800 nm and after adding a small amount of 1,8-diiodooctane (DIO) efficient photocurrent generation is achieved. Space-charge limited dark current and transient photovoltage measurements suggest that the use of the DIO component optimizes the electron/hole carrier mobility ratio, suppresses the non-geminate recombination losses and improves the charge extraction efficiency.
|Journal Article Type||Article|
|Publication Date||Aug 12, 2014|
|Journal||Journal of Materials Chemistry A|
|Publisher||Royal Society of Chemistry|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Singh, R., Aluicio-Sarduy, E., Kan, Z., Ye, T., MacKenzie, R., & Keivanidis, P. (2014). Fullerene-free organic solar cells with an efficiency of 3.7% based on a low-cost geometrically planar perylene diimide monomer. Journal of Materials Chemistry A, 2(35), 14348-14353. doi:10.1039/c4ta02851a|
|Additional Information||: This document is CrossCheck deposited; : Supplementary Information; : The Royal Society of Chemistry has an exclusive publication licence for this journal; OPEN ACCESS: The accepted version of this article will be made freely available after a 12 month embargo period; : Received 5 June 2014; Accepted 22 July 2014; Accepted Manuscript published 22 July 2014; Advance Article published 4 August 2014; Version of Record published 12 August 2014|
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