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Electronic structure evolution of fullerene on CH{sub 3}NH{sub 3}PbI{sub 3}

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4916079· OSTI ID:22395748
; ; ;  [1];  [2]; ; ; ;  [3]
  1. Department of Physics and Astronomy, University of Rochester, Rochester, New York, 14627 (United States)
  2. Hunan Key Laboratory for Super-microstructure and Ultrafast Process, College of Physics and Electronics, Central South University, Changsha 410083 (China)
  3. Department of Mechanical and Materials Engineering, Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588 (United States)
The thickness dependence of fullerene on CH{sub 3}NH{sub 3}PbI{sub 3} perovskite film surface has been investigated by using ultraviolet photoemission spectroscopy (UPS), X-ray photoemission spectroscopy (XPS), and inverse photoemission spectroscopy (IPES). The lowest unoccupied molecular orbital and highest occupied molecular orbital (HOMO) can be observed directly with IPES and UPS. It is observed that the HOMO level in fullerene shifts to lower binding energy. The XPS results show a strong initial shift of core levels to lower binding energy in the perovskite, which indicates that electrons transfer from the perovskite film to fullerene molecules. Further deposition of fullerene forms C{sub 60} solid, accompanied by the reduction of the electron transfer. The strongest electron transfer happened at 1/4 monolayer of fullerene.
OSTI ID:
22395748
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 11 Vol. 106; ISSN APPLAB; ISSN 0003-6951
Country of Publication:
United States
Language:
English

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Controllable Synthesis of 2D Perovskite on Different Substrates and Its Application as Photodetector journal August 2018
Perovskite-perovskite tandem photovoltaics with optimized band gaps journal October 2016
Defects in metal triiodide perovskite materials towards high-performance solar cells: origin, impact, characterization, and engineering journal January 2018
Recent Advances in Energetics and Stability of Metal Halide Perovskites for Optoelectronic Applications journal December 2018
Research Update: The electronic structure of hybrid perovskite layers and their energetic alignment in devices journal August 2016
Perovskite-perovskite tandem photovoltaics with optimized bandgaps text January 2016
Investigation on thermal evaporated CH 3 NH 3 PbI 3 thin films journal September 2015
Progress of Surface Science Studies on ABX 3 ‐Based Metal Halide Perovskite Solar Cells journal April 2020

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