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Simultaneously improved efficiency and average visible transmittance of semitransparent polymer solar cells with two ultra-narrow bandgap nonfullerene acceptors

Abstract

One narrow bandgap donor PTB7-Th and two ultra-narrow bandgap acceptors (COi8DFIC and IEICO-4F) were elaborately selected to fabricate semitransparent ternary polymer solar cells (PSCs). To find out the optimal content of IEICO-4F in acceptors, a series of opaque PSCs were firstly fabricated with 100 nm Ag as electrode. The power conversion efficiency (PCE) of the optimized opaque ternary PSCs arrives to 11.94% by incorporating 15 wt% IEICO-4F in acceptors. Then, the thickness of Ag was adjusted to balance its electrical conductivity and transmittance, and the 100 nm Ag was replaced by 15 nm Ag as semitransparent electrode. The semitransparent electrode possesses high transmittance in visible light range and low transmittance in long wavelength range, which is propitious to photon harvesting of ternary active layers with two ultra-narrow bandgap acceptors. The optimized semitransparent ternary PSCs show synchronously improved PCE of 8.23% and average visible transmittance (from 370 nm to 740 nm) of 20.78% compared with COi8DFIC based semitransparent binary PSCs. This work suggests the potential of ternary strategy for fabricating highly efficient semitransparent PSCs with narrow or ultra-narrow bandgap materials as active layers.

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Publication details

The article was received on 13 Sep 2018, accepted on 08 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08891H
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Simultaneously improved efficiency and average visible transmittance of semitransparent polymer solar cells with two ultra-narrow bandgap nonfullerene acceptors

    X. Ma, Z. Xiao, Q. An, M. Zhang, Z. Hu, J. Wang, L. Ding and F. Zhang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08891H

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