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UID:de38d399-f9e1-40ac-89fb-3e43a1444116
DTSTAMP:20261028T122434Z
SUMMARY:Stabilizing ferroelectricity in ultrathin BaTiO3 films with molecul
 ar electrodes
DESCRIPTION:<p><strong>PhD: Nona Mirzamohammadi</strong></p>\n<p><strong>Di
 rectors</strong>:</p>\n<p>Directors: ICREA Prof. Gustau Catalán and Group
  Leader\, Dr David Pesquera and Dr Kumara Cordero-Edwards\,&nbsp\;<a href=
 "/en/oxide-nanophysics-group">Oxide Nanophysics group</a>&nbsp\;at ICN2.</
 p>\n<p><strong>Short Abstract:</strong></p>\n<p>Downscaling ferroelectric 
 materials to nanometer and atomic dimensions is limited by depolarizing fi
 elds\, which destabilize polarization\, suppress switchability\, and reduc
 e retention. This thesis investigates para-aminobenzoic acid (pABA) molecu
 lar layers as adaptive molecular electrodes for compensating polarization 
 charge in ultrathin BaTiO₃ (BTO) films. First\, epitaxial BTO/SrRuO₃ (
 SRO) heterostructures are optimized by RF sputtering to obtain smooth\, re
 producible ultrathin films. Piezoresponse Force Microscopy measurements th
 en show that pABA functionalization significantly enhances polarization sw
 itching\, enabling stable domain writing at higher scan speeds than bare f
 ilms\, indicating faster and more effective screening than atmospheric ads
 orbates.</p>\n<p>In the ultrathin regime\, pABA restores stable polarizati
 on reversal and retention even below the conventional critical thickness. 
 Polarization-dependent tunneling measurements further demonstrate reproduc
 ible tunneling electroresistance in 2-unit-cell BTO films\, confirmed by l
 ocal CAFM and macroscopic current–voltage measurements. Overall\, this w
 ork establishes molecular screening as a route to stable\, switchable\, at
 omic-scale ferroelectric tunnel junctions.</p>\n<p data-start="573" data-e
 nd="1312">REGISTER <a href="https://forms.office.com/Pages/ResponsePage.as
 px?id=7y7ItE2bfUi-qg79NXo6WxH4jECG9S9KmyGb2KoqlQpUNjM4QkFPOEY2SExZRFNQR05H
 VzZKRElMRCQlQCN0PWcu">HERE</a></p>
DTSTART:20260529T120000
DTEND:20260529T215959
LOCATION:ICN2 Seminar Room\, Campus UAB
CATEGORIES:ICN2 Theses Defence
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