Fig. 4: Changes in PL spectral shape when P3HT films of different thicknesses are deposited on MAPbI3 or quartz. | Nature Communications

Fig. 4: Changes in PL spectral shape when P3HT films of different thicknesses are deposited on MAPbI3 or quartz.

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

Fig. 4: Changes in PL spectral shape when P3HT films of different thicknesses are deposited on MAPbI3 or quartz.The alternative text for this image may have been generated using AI.

Normalised PL intensity from P3HT films deposited through spin coating from solution with varying spin speeds onto either quartz (dashed lines) or MAPbI3:quartz (solid lines) substrates. The line colours indicate spin speeds that anti-correlate with the P3HT film thicknesses achieved. Spin speed was increased from 2000 to 6000 rpm in steps of 1000 rpm, yielding P3HT film thicknesses from 92 to 40 nm for the films on MAPbI3:quartz and 77 to 42 nm for the P3HT films on quartz (film thickness does not scale linearly with spin speed; the full list of values is provided in Supplementary Table 3). In addition, the normalised PL spectrum of a MAPbI3 film on quartz is shown as a dotted brown line.

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