Band-Edge Engineering at the Carbon Dot-TiO2 Interface by Substitutional Boron Doping

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F19%3A73597236" target="_blank" >RIV/61989592:15310/19:73597236 - isvavai.cz</a>

Výsledek na webu

<a href="https://pubs.acs.org/doi/pdf/10.1021/acs.jpcc.8b11554" target="_blank" >https://pubs.acs.org/doi/pdf/10.1021/acs.jpcc.8b11554</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.8b11554" target="_blank" >10.1021/acs.jpcc.8b11554</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Band-Edge Engineering at the Carbon Dot-TiO2 Interface by Substitutional Boron Doping

Popis výsledku v původním jazyce

We investigated the heterostructures of pristine and boron-doped carbon dots (CDs) with TiO2 using a first principles approach. Heterojunctions of CDs and TiO2 demonstrated type II band alignments that promote spatial separation of charge carriers and were well suited for sensitizer configuration. However, large CD band gaps severely restricted their optical efficiencies. Substitutional boron doping of the CDs introduced new electronic states and pulled the CDs&apos; conduction band minimum (CBM) down, resulting in dramatic reduction of CD band gaps (by 48-57%). The resulting band alignment of the boron-doped CD-TiO2 TiO2 heterostructures were found to be type I, in which CBM and valence band maximum of TiO2 straddled those of CDs and photoexcited carriers could migrate to CD side. This indicated better suitability for device configurations where conducting channel lies through the CDs but elevated the chance of recombination loss. However, the internal electric fields at these heterojunctions were found to selectively promote electron migration and hinder hole migration, which we postulate could counter the recombination loss in these systems. The obtained results offer insights into designing a new generation of water-splitting photocatalysts that would be able to utilize a broader spectrum of solar radiation than the current solutions.

Název v anglickém jazyce

Band-Edge Engineering at the Carbon Dot-TiO2 Interface by Substitutional Boron Doping

Popis výsledku anglicky

We investigated the heterostructures of pristine and boron-doped carbon dots (CDs) with TiO2 using a first principles approach. Heterojunctions of CDs and TiO2 demonstrated type II band alignments that promote spatial separation of charge carriers and were well suited for sensitizer configuration. However, large CD band gaps severely restricted their optical efficiencies. Substitutional boron doping of the CDs introduced new electronic states and pulled the CDs&apos; conduction band minimum (CBM) down, resulting in dramatic reduction of CD band gaps (by 48-57%). The resulting band alignment of the boron-doped CD-TiO2 TiO2 heterostructures were found to be type I, in which CBM and valence band maximum of TiO2 straddled those of CDs and photoexcited carriers could migrate to CD side. This indicated better suitability for device configurations where conducting channel lies through the CDs but elevated the chance of recombination loss. However, the internal electric fields at these heterojunctions were found to selectively promote electron migration and hinder hole migration, which we postulate could counter the recombination loss in these systems. The obtained results offer insights into designing a new generation of water-splitting photocatalysts that would be able to utilize a broader spectrum of solar radiation than the current solutions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

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

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

—

Svazek periodika

123

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

5980-5988

Kód UT WoS článku

000461537400017

EID výsledku v databázi Scopus

2-s2.0-85062518478