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arXiv · 2307.13174

Interface Modification for Energy Levels Alignment and Charge Extraction in CsPbI$_3$ Perovskite Solar Cells

Zafar Iqbal·Fengshuo Zu·Artem Musiienko·Emilio Gutierrez Partida·Hans Kobler·Thomas W. Gries·Gennaro V. Sannino·Laura Canil·Norbert Koch·Martin Stolterfoht·Dieter Neher·Michele Pavone·Ana Belen Munoz-Garcia·Antonio Abate·Qiong Wang
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Abstract

In perovskite solar cells (PSCs) energy levels alignment and charge extraction at the interfaces are the essential factors directly affecting the device performance. In this work, we present a modified interface between all-inorganic CsPbI$_3$ perovskite and its hole selective contact (Spiro-OMeTAD), realized by a dipole molecule trioctylphosphine oxide (TOPO), to align the energy levels. On a passivated perovskite film, by n-Octyl ammonium Iodide (OAI), we created an upward surface band-bending at the interface by TOPO treatment. This improved interface by the dipole molecule induces a better energy level alignment and enhances the charge extraction of holes from the perovskite layer to the hole transport material. Consequently, a Voc of 1.2 V and high-power conversion efficiency (PCE) of over 19% were achieved for inorganic CsPbI$_3$ perovskite solar cells. Further, to demonstrate the effect of the TOPO dipole molecule, we present a layer-by-layer charge extraction study by transient surface photovoltage technique (trSPV) accomplished by charge transport simulation.

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Zafar Iqbal, Fengshuo Zu, Artem Musiienko, Emilio Gutierrez Partida, Hans Kobler, Thomas W. Gries, Gennaro V. Sannino, Laura Canil, Norbert Koch, Martin Stolterfoht, Dieter Neher, Michele Pavone, Ana Belen Munoz-Garcia, Antonio Abate, Qiong Wang. 2023-07-24. Interface Modification for Energy Levels Alignment and Charge Extraction in CsPbI$_3$ Perovskite Solar Cells. https://doi.org/10.1021/acsenergylett.3c01522

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