Valence Level Character in a Mixed Perovskite Material and Determination of the Valence Band Maximum from Photoelectron Spectroscopy: Variation with Photon Energy

Valence Level Character in a Mixed Perovskite Material and Determination of the Valence Band Maximum from Photoelectron Spectroscopy : Variation with Photon Energy

Philippe, Bertrand, Dr. 1986- (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik

Jacobsson, T. Jesper, 1984- (author): Uppsala universitet,Fysikalisk kemi,École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

Correa-Baena, Juan-Pablo (author): École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Massachusetts Institute of Technology, Cambridge, USA

Cappel, Ute B. (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik

Hagfeldt, Anders (author): École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

Odelius, Michael (author): Stockholms universitet,Fysikum,Stockholm University, Stockholm, Sweden

Rensmo, Håkan (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik

(creator_code:org_t)

2017-11-21
2017
English.
In: The Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 121:48, s. 26655-26666

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Abstract Subject headings

A better understanding of the electronic structure of perovskite materials used in photovoltaic devices is essential for their development and optimization. In this investigation, synchrotron-based photoelectron spectroscopy (PES) was used to experimentally delineate the character and energy position of the valence band structures of a mixed perovskite. The valence band was measured using PES with photon energies ranging from ultraviolet photoelectron spectroscopy (21.2 eV) to hard X-rays (up to 4000 eV), and by taking the variation of the photoionization cross sections into account, we could experimentally determine the inorganic and organic contributions. The experiments were compared to theoretical calculations to further distinguish the role of the different anions in the electronic structure. This work also includes a thorough study of the valence band maximum and its position in relation to the Fermi level, which is crucial for the design and optimization of complete solar cells and their functional properties.

By the author/editor: Philippe, Bertra ...; Jacobsson, T. Je ...; Correa-Baena, Ju ...; Jena, Naresh K.; Banerjee, Amitav ...; Chakraborty, Sud ...; show more...; Cappel, Ute B.; Ahuja, Rajeev, 1 ...; Hagfeldt, Anders; Odelius, Michael; Rensmo, Håkan; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

By the university: Stockholm University; Royal Institute of Technology; Uppsala University

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