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The Electronic Structure of MAPI‐Based Perovskite Solar Cells: Detailed Band Diagram Determination by Photoemission Spectroscopy Comparing Classical and Inverted Device Stacks

Hellmann, Tim ; Das, Chittaranjan ; Abzieher, Tobias ; Schwenzer, Jonas A. ; Wussler, Michael ; Dachauer, Ralph ; Paetzold, Ulrich W. ; Jaegermann, Wolfram ; Mayer, Thomas (2024)
The Electronic Structure of MAPI‐Based Perovskite Solar Cells: Detailed Band Diagram Determination by Photoemission Spectroscopy Comparing Classical and Inverted Device Stacks.
In: Advanced Energy Materials, 2020, 10 (42)
doi: 10.26083/tuprints-00016176
Artikel, Zweitveröffentlichung, Verlagsversion

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Kurzbeschreibung (Abstract)

High power conversion efficiency (PCE) perovskite solar cells (PSCs) rely on optimal alignment of the energy bands between the perovskite absorber and the adjacent charge extraction layers. However, since most of the materials and devices of high performance are prepared by solution‐based techniques, a deposition of films with thicknesses of a few nanometers and therefore a detailed analysis of surface and interface properties remains difficult. To identify the respective photoactive interfaces, photoelectron spectroscopy measurements are performed on device stacks of methylammonium‐lead‐iodide (MAPI)‐based PSCs in classical and inverted architectures in the dark and under illumination at open‐circuit conditions. The analysis shows that vacuum‐deposited MAPI perovskite absorber layers are n‐type, independent of the architecture and of the charge transport layer that it is deposited on (n‐type SnO₂ or p‐type NiOₓ). It is found that the majority of the photovoltage is formed at the n‐MAPI/p‐HEL (hole extraction layer) junction for both architectures, highlighting the importance of this interface for further improvement of the photovoltage and therefore also the PCE. Finally, an experimentally derived band diagram of the completed devices for the dark and the illuminated case is presented.

Typ des Eintrags: Artikel
Erschienen: 2024
Autor(en): Hellmann, Tim ; Das, Chittaranjan ; Abzieher, Tobias ; Schwenzer, Jonas A. ; Wussler, Michael ; Dachauer, Ralph ; Paetzold, Ulrich W. ; Jaegermann, Wolfram ; Mayer, Thomas
Art des Eintrags: Zweitveröffentlichung
Titel: The Electronic Structure of MAPI‐Based Perovskite Solar Cells: Detailed Band Diagram Determination by Photoemission Spectroscopy Comparing Classical and Inverted Device Stacks
Sprache: Englisch
Publikationsjahr: 9 Januar 2024
Ort: Darmstadt
Publikationsdatum der Erstveröffentlichung: 2020
Ort der Erstveröffentlichung: Weinheim
Verlag: Wiley‐VCH
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Advanced Energy Materials
Jahrgang/Volume einer Zeitschrift: 10
(Heft-)Nummer: 42
Kollation: 11 Seiten
DOI: 10.26083/tuprints-00016176
URL / URN: https://tuprints.ulb.tu-darmstadt.de/16176
Zugehörige Links:
Herkunft: Zweitveröffentlichung DeepGreen
Kurzbeschreibung (Abstract):

High power conversion efficiency (PCE) perovskite solar cells (PSCs) rely on optimal alignment of the energy bands between the perovskite absorber and the adjacent charge extraction layers. However, since most of the materials and devices of high performance are prepared by solution‐based techniques, a deposition of films with thicknesses of a few nanometers and therefore a detailed analysis of surface and interface properties remains difficult. To identify the respective photoactive interfaces, photoelectron spectroscopy measurements are performed on device stacks of methylammonium‐lead‐iodide (MAPI)‐based PSCs in classical and inverted architectures in the dark and under illumination at open‐circuit conditions. The analysis shows that vacuum‐deposited MAPI perovskite absorber layers are n‐type, independent of the architecture and of the charge transport layer that it is deposited on (n‐type SnO₂ or p‐type NiOₓ). It is found that the majority of the photovoltage is formed at the n‐MAPI/p‐HEL (hole extraction layer) junction for both architectures, highlighting the importance of this interface for further improvement of the photovoltage and therefore also the PCE. Finally, an experimentally derived band diagram of the completed devices for the dark and the illuminated case is presented.

Freie Schlagworte: energy band diagrams, perovskite solar cells, photoelectron spectroscopy, surface photovoltage
ID-Nummer: 2002129
Status: Verlagsversion
URN: urn:nbn:de:tuda-tuprints-161761
Sachgruppe der Dewey Dezimalklassifikatin (DDC): 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung
Hinterlegungsdatum: 09 Jan 2024 12:17
Letzte Änderung: 10 Jan 2024 09:20
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