Fig. 2: Schematic representation of the model describing ET in polymer:MAPbI3 two-layer films. | Nature Communications

Fig. 2: Schematic representation of the model describing ET in polymer:MAPbI3 two-layer films.

From: Efficient energy transfer mitigates parasitic light absorption in molecular charge-extraction layers for perovskite solar cells

Fig. 2

The top right shows the two-layer sample architecture on quartz substrates and the typical excitation geometry. Polymer excitation from the front surface causes an exponentially decaying profile in the polymer layer. ET between the polymer and the underlying MAPbI3 results in accelerated PL decays (top right). The bottom graphic shows the hierarchy of the modelling and its dependence on input parameters: polymer film thickness L, PL lifetime τd of the polymer in the absence of MAPbI3, polymer PLQE and polymerabsorption coefficient at the wavelength of excitation α(λexc). The Förster radius \({R}_{0}^{{\rm{SY}}}\) for ET between Super Yellow and MAPbI3, and the nominal acceptor concentration Ca that applies to MAPbI3, are first determined from fits to PL-decay transients for Super Yellow:MAPbI3 samples, and used to calibrate modelled transients for samples involving the other polymers.

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