High Excitation Intensity Opens a New Trapping Channel in Organic - Inorganic Hybrid Perovskite Nanoparticles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F16%3A00469197" target="_blank" >RIV/61389021:_____/16:00469197 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1021/acsenergylett.6b00352" target="_blank" >http://dx.doi.org/10.1021/acsenergylett.6b00352</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsenergylett.6b00352" target="_blank" >10.1021/acsenergylett.6b00352</a>

Jazyk výsledku

angličtina

Název v původním jazyce

High Excitation Intensity Opens a New Trapping Channel in Organic - Inorganic Hybrid Perovskite Nanoparticles

Popis výsledku v původním jazyce

We investigated the excited-state dynamics of CH3NH3PbBr3 perovskite nanoparticles (NPs) and bulk crystals under various excitation intensity regimes using transient absorption spectroscopy. We confirmed the sub-band gap hole trap states with optical transition to the conduction band in both samples. In bulk crystals, the excited-state dynamics is independent of pump intensity. However, in NPs, pronounced intensity dependence appears. At low intensities, the hole trap states do not affect the excited-state dynamics due to the potential barrier between the photogenerated holes and the surface trap states. When the excitation density is much higher than one per NP, charge accumulation makes hot holes overcome the barrier and get trapped with electrons long living in the conduction band (≫10 ns). This explains the high emissive properties of such NPs despite the existence of surface traps. However, in the application of emitting devices requiring high excitation intensity, the surface trapping becomes significant.

Název v anglickém jazyce

High Excitation Intensity Opens a New Trapping Channel in Organic - Inorganic Hybrid Perovskite Nanoparticles

Popis výsledku anglicky

We investigated the excited-state dynamics of CH3NH3PbBr3 perovskite nanoparticles (NPs) and bulk crystals under various excitation intensity regimes using transient absorption spectroscopy. We confirmed the sub-band gap hole trap states with optical transition to the conduction band in both samples. In bulk crystals, the excited-state dynamics is independent of pump intensity. However, in NPs, pronounced intensity dependence appears. At low intensities, the hole trap states do not affect the excited-state dynamics due to the potential barrier between the photogenerated holes and the surface trap states. When the excitation density is much higher than one per NP, charge accumulation makes hot holes overcome the barrier and get trapped with electrons long living in the conduction band (≫10 ns). This explains the high emissive properties of such NPs despite the existence of surface traps. However, in the application of emitting devices requiring high excitation intensity, the surface trapping becomes significant.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

ACS ENERGY LETTERS

ISSN

2380-8195

e-ISSN

—

Svazek periodika

1

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

1154-1161

Kód UT WoS článku

000390086400013

EID výsledku v databázi Scopus

2-s2.0-85015213173