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

Bertrand Philippe | Zendy; T. Jesper Jacobsson | Zendy; JuanPablo CorreaBaena | Zendy; Naresh K. Jena | Zendy; Amitava Banerjee | Zendy; Sudip Chakraborty | Zendy; Ute B. Cappel | Zendy; Rajeev Ahuja | Zendy; Anders Hagfeldt | Zendy; Michael Odelius | Zendy; Håkan Rensmo | Zendy

Open Access

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

Author(s) -

Bertrand Philippe,

T. Jesper Jacobsson,

JuanPablo CorreaBaena,

Naresh K. Jena,

Amitava Banerjee,

Sudip Chakraborty,

Ute B. Cappel,

Rajeev Ahuja,

Anders Hagfeldt,

Michael Odelius,

Håkan Rensmo

Publication year - 2017

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/acs.jpcc.7b08948

Subject(s) - ultraviolet photoelectron spectroscopy , photoionization , x ray photoelectron spectroscopy , valence (chemistry) , fermi level , photoemission spectroscopy , spectroscopy , photon energy , electronic structure , materials science , atomic physics , quasi fermi level , chemistry , electronic band structure , band gap , perovskite (structure) , semimetal , molecular physics , photon , condensed matter physics , physics , optoelectronics , computational chemistry , nuclear magnetic resonance , optics , crystallography , electron , ion , ionization , quantum mechanics , organic chemistry

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...

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