As-doped SnSe single crystals: Ambivalent doping and interaction with intrinsic defects

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F21%3A39917759" target="_blank" >RIV/00216275:25310/21:39917759 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/21:10427380 RIV/00216224:14310/21:00121244

Výsledek na webu

<a href="https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.085203" target="_blank" >https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.085203</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.103.085203" target="_blank" >10.1103/PhysRevB.103.085203</a>

Jazyk výsledku

angličtina

Název v původním jazyce

As-doped SnSe single crystals: Ambivalent doping and interaction with intrinsic defects

Popis výsledku v původním jazyce

We performed ambivalent doping study on single crystals of two sets, SnSe1-xAsx and Sn1-xAsxSe, with the aim to explore the interaction of doping species with intrinsic defects. We found that As atoms substitute preferentially for Se atoms in both sets forming the extrinsic substitutional point defect As-Se. In the first set, As lowers the concentration of Sn vacancies, V-Sn, by an order of magnitude compared to undoped stoichiometric SnSe crystal. The remaining Sn vacancies are preferentially coordinated with As atoms. Importantly, a very low concentration of As led to healing process of hosting structure in terms of intrinsic point defects and eventual SnSe2 inclusions. This is reflected in an increase of the Hall mobility and drop of the Hall concentration. In the second set, the concentration of Sn vacancies markedly increases upon doping in contrast to the first set. Additionally, the coordination of Sn vacancies by As atoms is less evident due to the high concentration of vacancies. The substitutional defect As-Se is a deep-level defect that produces no free carriers at room temperature. Moreover, the coupling of V-Sn to As-Se defects increases their activation energy. This results in an unprecedentedly low Hall concentration in SnSe which stays below 10(16) cm(-3) for x = 0.0075. The present study indicates that doping of SnSe is a rather complex process that generally includes a strong interaction of doping atoms with the hosting structure. On the other hand, such doping allows adjustment of the type and concentration of defects. The present study reveals a general tendency of point defects to clustering, which modifies the properties of point defects markedly.

Název v anglickém jazyce

As-doped SnSe single crystals: Ambivalent doping and interaction with intrinsic defects

Popis výsledku anglicky

We performed ambivalent doping study on single crystals of two sets, SnSe1-xAsx and Sn1-xAsxSe, with the aim to explore the interaction of doping species with intrinsic defects. We found that As atoms substitute preferentially for Se atoms in both sets forming the extrinsic substitutional point defect As-Se. In the first set, As lowers the concentration of Sn vacancies, V-Sn, by an order of magnitude compared to undoped stoichiometric SnSe crystal. The remaining Sn vacancies are preferentially coordinated with As atoms. Importantly, a very low concentration of As led to healing process of hosting structure in terms of intrinsic point defects and eventual SnSe2 inclusions. This is reflected in an increase of the Hall mobility and drop of the Hall concentration. In the second set, the concentration of Sn vacancies markedly increases upon doping in contrast to the first set. Additionally, the coordination of Sn vacancies by As atoms is less evident due to the high concentration of vacancies. The substitutional defect As-Se is a deep-level defect that produces no free carriers at room temperature. Moreover, the coupling of V-Sn to As-Se defects increases their activation energy. This results in an unprecedentedly low Hall concentration in SnSe which stays below 10(16) cm(-3) for x = 0.0075. The present study indicates that doping of SnSe is a rather complex process that generally includes a strong interaction of doping atoms with the hosting structure. On the other hand, such doping allows adjustment of the type and concentration of defects. The present study reveals a general tendency of point defects to clustering, which modifies the properties of point defects markedly.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

—

Svazek periodika

103

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

085203

Kód UT WoS článku

000616412100002

EID výsledku v databázi Scopus

2-s2.0-85101909353