On the Suitable Choice of Metal for HgTe Nanocrystal-Based Photodiode: To Amalgam or Not to Amalgam
- Rodolphe AlchaarRodolphe AlchaarSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Rodolphe Alchaar
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- Corentin DabardCorentin DabardSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceLaboratoire de Physique et d’Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université, Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin, 75005 Paris, FranceMore by Corentin Dabard
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- Dario MastrippolitoDario MastrippolitoDepartment of Physical and Chemical Sciences (DSFC), University of L’Aquila, 67100 L’Aquila, ItalyMore by Dario Mastrippolito
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- Erwan BossavitErwan BossavitSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceSynchrotron SOLEIL, L’Orme des Merisiers, Départementale 128, 91190 Saint-Aubin, FranceMore by Erwan Bossavit
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- Tung Huu DangTung Huu DangSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Tung Huu Dang
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- Mariarosa CavalloMariarosa CavalloSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Mariarosa Cavallo
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- Adrien KhaliliAdrien KhaliliSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Adrien Khalili
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- Huichen ZhangHuichen ZhangSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Huichen Zhang
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- Lucile DomenachLucile DomenachSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Lucile Domenach
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- Nicolas LedosNicolas LedosSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Nicolas Ledos
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- Yoann PradoYoann PradoSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Yoann Prado
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- David TroadecDavid TroadecUniversité Lille, CNRS, Centrale Lille, Université Polytechnique Hauts-de-France, Junia, UMR 8520 - IEMN, F-59000 Lille, FranceMore by David Troadec
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- Ji DaiJi DaiCELLS - ALBA Synchrotron Radiation Facility, Carrer de la Llum 2-26, 08290 Cerdanyola del Valles, Barcelona, SpainMore by Ji Dai
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- Massimo TallaridaMassimo TallaridaCELLS - ALBA Synchrotron Radiation Facility, Carrer de la Llum 2-26, 08290 Cerdanyola del Valles, Barcelona, SpainMore by Massimo Tallarida
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- Federico BistiFederico BistiDepartment of Physical and Chemical Sciences (DSFC), University of L’Aquila, 67100 L’Aquila, ItalyMore by Federico Bisti
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- Fabian CadizFabian CadizPhysique de la Matière Condensée, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, 91128 Palaiseau, FranceMore by Fabian Cadiz
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- Gilles PatriarcheGilles PatriarcheCentre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay, 10 Boulevard Thomas Gobert, 91120 Palaiseau, FranceMore by Gilles Patriarche
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- José AvilaJosé AvilaSynchrotron SOLEIL, L’Orme des Merisiers, Départementale 128, 91190 Saint-Aubin, FranceMore by José Avila
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- Emmanuel Lhuillier*Emmanuel Lhuillier*Email: [email protected]Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Emmanuel Lhuillier
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- Debora PierucciDebora PierucciSorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, FranceMore by Debora Pierucci
Abstract
HgTe, thanks to its unique spectral tunability in the infrared, is the only material able to cover near-, short-, and mid-wave infrared. Current best devices rely on electrodes made from transparent conductive oxides and gold, but so far, none of these completely fit for the intended purpose. Gold is not compatible with Si foundries, and transparent conductive oxides are highly lossy in this spectral range, limiting electrode transparency. Metal-based electrodes appear as good alternative candidates but require further investigations. While obvious constraints of work function get raised, chemical stability appears equally important. Here, we screen the use of Au, Al, Ag, and Zn as possible metals and reveal that in the case of Ag, dramatic transformations of Ag and HgTe are observed. Especially, a cation exchange procedure can occur over a solid-state film without intentional heating of the sample. This process has then been studied by combining both structural and electronic probes. This work points out the importance of the careful choice of surrounding electrodes in the case of HgTe since the observed mechanism is likely not limited to Ag. On the other hand, both Au and Al appear stable toward this transformation.
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