Influence of static disorder of charge transfer state on voltage loss in organic photovoltaics

Jun Yan (), Elham Rezasoltani, Mohammed Azzouzi, Flurin Eisner and Jenny Nelson ()
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Jun Yan: Imperial College London
Elham Rezasoltani: Imperial College London
Mohammed Azzouzi: Imperial College London
Flurin Eisner: Imperial College London
Jenny Nelson: Imperial College London

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract Spectroscopic measurements of charge transfer (CT) states provide valuable insight into the voltage losses in organic photovoltaics (OPVs). Correct interpretation of CT-state spectra depends on knowledge of the underlying broadening mechanisms, and the relative importance of molecular vibrational broadening and variations in the CT-state energy (static disorder). Here, we present a physical model, that obeys the principle of detailed balance between photon absorption and emission, of the impact of CT-state static disorder on voltage losses in OPVs. We demonstrate that neglect of CT-state disorder in the analysis of spectra may lead to incorrect estimation of voltage losses in OPV devices. We show, using measurements of polymer:non-fullerene blends of different composition, how our model can be used to infer variations in CT-state energy distribution that result from variations in film microstructure. This work highlights the potential impact of static disorder on the characteristics of disordered organic blend devices.

Date: 2021
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DOI: 10.1038/s41467-021-23975-3

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