PhD Theses

Yunwei Sheng will defend her PhD Thesis on 27 Oct 2022 at ICMAB

The PhD researcher Yunwei Sheng from the Multifunctional Thin Films and Complex Structures (MULFOX) Group at ICMAB-CSIC, will defend her PhD thesis on Thursday, 27 October 2022 at 10:00 am at ICMAB.

Anna
19 October 2022

Photoresponsive polar LuMnO3 and nonpolar LaFeO3 oxides in non-centrosymmetric structures

 

Yunwei Sheng, Multifunctional Thin Films and Complex Structures (MULFOX) at ICMAB-CSIC

Date: Thursday, 27 October 2022
Time: 10:00 am
Venue: Sala d'Actes Carles Miravitlles, ICMAB-CSIC. Register to attend by Zoom. 

Abstract:

Ferroelectric photovoltaics are receiving a new interest owing to the possible presence of an internal field extending all over the material and the bulk photovoltaic effect (BPE) associated to their non-centrosymmetric character. The BPE in ferroelectrics has been focused on BiFeO3 with a bandgap of 2.7 eV, implying limited responsivity at the visible range. Hexagonal manganites h-ReMnO3 (Re = Lu, Y, etc.) with a narrower bandgap (≈ 1.5 eV) could be promising candidates where BPE had not been documented, and this is the first objective.

Non-centrosymmetry can be intrinsic to the photoabsorber and can be engineered by designing the device. The nonpolar LaFeO3 (bandgap ≈ 2.4 eV) is a good candidate to explore its photoresponsivity to analyze the role of band alignment on photovoltage and compare its photoresponsivity to polar materials.

Supervisors:

  • Josep Fontcuberta, MULFOX group, ICMAB-CSIC
  • Ignasi Fina, MULFOX group, ICMAB-CSIC

PhD Comittee:

  • President: Sylvia Matzen, Paris-Saclay University, France
  • Secretary: Mariona Coll Bau, Institut de Ciència de Materials de Barcelona, ICMAB-CSIC
  • Vocal: Akash Bhatnagar, Schott AG, Germany

University: Universitat Autònoma de Barcelona (UAB)
PhD Programme: Materials Science PhD Programme

Picture1 Yunwei Sheng

Photocurrent dependence on light polarization angle | Yunwei Sheng

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