At very high light intensities, thermal effects may also start to play a role. These effects are generally associated with a turnover of the V OC with increasing intensity 56 but could also influence the photocurrent.
Considering that indoor light photovoltaic cells and photodetectors operate under vastly different light intensity regimes compared with outdoor solar cells, a comprehensive understanding of the intensity dependence of charge collection (over a very broad range of intensities) is needed to chart the full potential of OPV-based technologies.
Signatures of various photocurrent loss mechanisms in steady-state IPC Expected slopes in a log-log plot for relations between short-circuit current density (J SC), external quantum efficiency (EQE), and light intensity (I L) when different photocurrent loss mechanism are predominant.
The corresponding intensity dependence of the photocurrent is described by α = 1 1 / (2 + 2 l). This dependence has also been suggested previously by Hartnagel and Kirchartz. 27 The above considerations may be qualitatively extended to the case with a general, but fixed, charge carrier recombination order δ for photogenerated charge carriers.
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