Impact of Small Phonon Energies on the Charge-Carrier Lifetimes in Metal-Halide Perovskites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F18%3A00324577" target="_blank" >RIV/68407700:21230/18:00324577 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1021/acs.jpclett.7b03414" target="_blank" >http://dx.doi.org/10.1021/acs.jpclett.7b03414</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpclett.7b03414" target="_blank" >10.1021/acs.jpclett.7b03414</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Impact of Small Phonon Energies on the Charge-Carrier Lifetimes in Metal-Halide Perovskites

Popis výsledku v původním jazyce

Metal-halide perovskite (MHP) solar cells exhibit long non-radiative lifetimes as a crucial feature enabling high efficiencies. Long non-radiative lifetimes occur if the transfer of electronic into vibrational energy is slow due to, e.g., a low trap density, weak electronphonon coupling or the requirement to release a many phonons in the electronic transition. Here, we combine known material properties of MHPs with basic models for electron-phonon coupling and multiphonon-transition rates in polar semiconductors. We find that the low phonon energies of MAPbI3 lead to a strong dependence of recombination rates on trap position, which we deduce from the underlying physical effects determining non-radiative transitions. This is important for non-radiative recombination in MHPs, as it implies that they are rather insensitive to defects that are not at midgap energy, which can lead to long lifetimes. Therefore, the low phonon energies of MHPs are likely an important factor for their optoelectronic performance.

Název v anglickém jazyce

Impact of Small Phonon Energies on the Charge-Carrier Lifetimes in Metal-Halide Perovskites

Popis výsledku anglicky

Metal-halide perovskite (MHP) solar cells exhibit long non-radiative lifetimes as a crucial feature enabling high efficiencies. Long non-radiative lifetimes occur if the transfer of electronic into vibrational energy is slow due to, e.g., a low trap density, weak electronphonon coupling or the requirement to release a many phonons in the electronic transition. Here, we combine known material properties of MHPs with basic models for electron-phonon coupling and multiphonon-transition rates in polar semiconductors. We find that the low phonon energies of MAPbI3 lead to a strong dependence of recombination rates on trap position, which we deduce from the underlying physical effects determining non-radiative transitions. This is important for non-radiative recombination in MHPs, as it implies that they are rather insensitive to defects that are not at midgap energy, which can lead to long lifetimes. Therefore, the low phonon energies of MHPs are likely an important factor for their optoelectronic performance.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20704 - Energy and fuels

Projekt

<a href="/cs/project/EF15_003%2F0000464" target="_blank" >EF15_003/0000464: Centrum pokročilé fotovoltaiky</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Journal of Physical Chemistry Letters

ISSN

1948-7185

e-ISSN

—

Svazek periodika

9

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

939-946

Kód UT WoS článku

000426803200002

EID výsledku v databázi Scopus

2-s2.0-85042728499