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Photosensitivity and Carrier Densities of Perovskite Solar Absorbers
https://orcid.org/0000-0001-7170-4513
https://orcid.org/0000-0002-7243-3855
https://orcid.org/0000-0003-1962-8570
https://orcid.org/0000-0001-7212-019X
https://orcid.org/0000-0002-7560-2634
AbstractDark and light current–voltage characteristics of perovskite solar absorbers are analyzed in terms of their carrier densities. The analysis reveals p‐type large polarons as a dominant carrier type in the investigated perovskite solar cells. The mechanism causing photosensitivity is attributed to the dissociation (and pairing) of bipolarons to large polarons (and vice versa) that are controlled by the internal potential Γ. As an example, the polaron concept is tested for a formamidinium lead triiodide perovskite solar cell. The individual steps of the data analysis are demonstrated and determine the ionicity factor of this perovskite film, quantify the density of the large polarons, and predict the gain and loss of photo‐induced carriers. It is deduced that a reversible light‐on/off operation can only occur when the bias voltage never exceeds a critical value of the internal potential. The results gained in this study suggest that the novel analysis can be successively applied on different hybrid perovskite materials, too.
Photosensitivity and Carrier Densities of Perovskite Solar Absorbers
https://orcid.org/0000-0001-7170-4513
https://orcid.org/0000-0002-7243-3855
https://orcid.org/0000-0003-1962-8570
https://orcid.org/0000-0001-7212-019X
https://orcid.org/0000-0002-7560-2634
AbstractDark and light current–voltage characteristics of perovskite solar absorbers are analyzed in terms of their carrier densities. The analysis reveals p‐type large polarons as a dominant carrier type in the investigated perovskite solar cells. The mechanism causing photosensitivity is attributed to the dissociation (and pairing) of bipolarons to large polarons (and vice versa) that are controlled by the internal potential Γ. As an example, the polaron concept is tested for a formamidinium lead triiodide perovskite solar cell. The individual steps of the data analysis are demonstrated and determine the ionicity factor of this perovskite film, quantify the density of the large polarons, and predict the gain and loss of photo‐induced carriers. It is deduced that a reversible light‐on/off operation can only occur when the bias voltage never exceeds a critical value of the internal potential. The results gained in this study suggest that the novel analysis can be successively applied on different hybrid perovskite materials, too.
Photosensitivity and Carrier Densities of Perovskite Solar Absorbers
https://orcid.org/0000-0001-7170-4513
https://orcid.org/0000-0002-7243-3855
https://orcid.org/0000-0003-1962-8570
https://orcid.org/0000-0001-7212-019X
https://orcid.org/0000-0002-7560-2634
AbstractDark and light current–voltage characteristics of perovskite solar absorbers are analyzed in terms of their carrier densities. The analysis reveals p‐type large polarons as a dominant carrier type in the investigated perovskite solar cells. The mechanism causing photosensitivity is attributed to the dissociation (and pairing) of bipolarons to large polarons (and vice versa) that are controlled by the internal potential Γ. As an example, the polaron concept is tested for a formamidinium lead triiodide perovskite solar cell. The individual steps of the data analysis are demonstrated and determine the ionicity factor of this perovskite film, quantify the density of the large polarons, and predict the gain and loss of photo‐induced carriers. It is deduced that a reversible light‐on/off operation can only occur when the bias voltage never exceeds a critical value of the internal potential. The results gained in this study suggest that the novel analysis can be successively applied on different hybrid perovskite materials, too.
Photosensitivity and Carrier Densities of Perovskite Solar Absorbers
Advanced Science
Kot, Małgorzata (Autor:in) / Gawlińska‐Nęcek, Katarzyna (Autor:in) / Pożarowska, Emilia (Autor:in) / Henkel, Karsten (Autor:in) / Schmeißer, Dieter (Autor:in)
25.02.2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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