journal article·2023-10-13Open access

Interface Modification for Energy Level Alignment and Charge Extraction in CsPbI3 Perovskite Solar Cells

Zafar Iqbal, Fengshuo Zu, Artem Musiienko, Emilio Gutierrez-Partida, Hans Köbler, Thomas W. Gries, Gennaro V. Sannino, Laura Canil, Norbert Koch, Martin Stolterfoht, Dieter Neher, Michele Pavone, Ana Belen Muñoz-García, Antonio Abate, Qiong Wang

ACS Energy Letters· Volume 8· Issue 10

Abstract

High Resolution Image Download MS PowerPoint Slide In perovskite solar cells (PSCs) energy level 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 the dipole molecule trioctylphosphine oxide (TOPO), to align the energy levels. On a passivated perovskite film, with n -octylammonium 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 V oc of 1.2 V and a 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 a transient surface photovoltage (trSPV) technique accomplished by a charge transport simulation.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Chalcogenide Semiconductor Thin Films

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Helmholtz-Zentrum Berlin für Materialien und Energie GmbH. Hahn-Meitner-Platz 1, 14109 Berlin, Germany

Institut für Physik & IRIS Adlershof, Humboldt-Universität zu Berlin, 12489 Berlin, Germany

Institute for Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Potsdam-Golm, Germany

Department of Physics “Ettore Pancini”, University of Naples Federico II, Comp. Univ. Monte S. Angelo, via Cintia 26, 80126 Naples, Italy

The Chinese University of Hong Kong, Electronic Engineering Department, Shatin N.T., Hong Kong 999077, People’s Republic of China

Department of Chemical Sciences, University of Naples Federico II, Comp. Univ. Monte S. Angelo, Via Cintia 26, 80126 Naples, Italy

Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld, Germany

Department of Chemical Materials and Production Engineering, University of Naples Federico II, Piazzale Vincenzo Tecchio 80, 80125 Naples, Italy

Funding

Deutscher Akademischer Austauschdienst · Deutsche Forschungsgemeinschaft · Bundesministerium f?r Wirtschaft und Energie · H2020 Marie Sklodowska-Curie Actions · Chinese University of Hong Kong

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