Hot Carrier Cooling in In0.17Ga0.83As/GaAs0.80P0.20 Multiple Quantum Wells: The Effect of Barrier Thickness

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F16%3A00308833" target="_blank" >RIV/68407700:21340/16:00308833 - isvavai.cz</a>

Výsledek na webu

<a href="http://ieeexplore.ieee.org/document/7295560/" target="_blank" >http://ieeexplore.ieee.org/document/7295560/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/JPHOTOV.2015.2480222" target="_blank" >10.1109/JPHOTOV.2015.2480222</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Hot Carrier Cooling in In0.17Ga0.83As/GaAs0.80P0.20 Multiple Quantum Wells: The Effect of Barrier Thickness

Popis výsledku v původním jazyce

The hot carrier solar cell is an advanced concept photovoltaic device that is predicted to deliver efficiencies in excess of conventional single bandgap devices. The design requires the ability to concurrently have extended carrier thermalization times within an absorber material, giving a hot carrier population, and the ability to efficiently collect the hot carriers at an energy above the bandgap of the absorber material. In order to achieve this, we require an absorber material with a long-lived hot carrier population. We investigate the carrier thermalization rates of InIn0.17Ga0.83As/GaAs0.80P0.20 multiple quantum well samples with different barrier thicknesses. For a 40 quantum well strain-balanced structure, the cooling lifetime is found to be 1.23 ± 0.07 ns, but in samples which are not strain-balanced, defect-assisted carrier cooling increases the thermalization rate. Immediately following an ultrafast excitation, the initial carrier temperature is greater in samples with wider barriers. However, any gain in carrier temperature from utilizing wide barriers is negated by an increased thermalization rate as one deviates from strain-balanced conditions. We conclude that strain balancing is required for multiple quantum well hot carrier absorbers.

Název v anglickém jazyce

Hot Carrier Cooling in In0.17Ga0.83As/GaAs0.80P0.20 Multiple Quantum Wells: The Effect of Barrier Thickness

Popis výsledku anglicky

The hot carrier solar cell is an advanced concept photovoltaic device that is predicted to deliver efficiencies in excess of conventional single bandgap devices. The design requires the ability to concurrently have extended carrier thermalization times within an absorber material, giving a hot carrier population, and the ability to efficiently collect the hot carriers at an energy above the bandgap of the absorber material. In order to achieve this, we require an absorber material with a long-lived hot carrier population. We investigate the carrier thermalization rates of InIn0.17Ga0.83As/GaAs0.80P0.20 multiple quantum well samples with different barrier thicknesses. For a 40 quantum well strain-balanced structure, the cooling lifetime is found to be 1.23 ± 0.07 ns, but in samples which are not strain-balanced, defect-assisted carrier cooling increases the thermalization rate. Immediately following an ultrafast excitation, the initial carrier temperature is greater in samples with wider barriers. However, any gain in carrier temperature from utilizing wide barriers is negated by an increased thermalization rate as one deviates from strain-balanced conditions. We conclude that strain balancing is required for multiple quantum well hot carrier absorbers.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

—

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

IEEE Journal of Photovoltaics

ISSN

2156-3381

e-ISSN

—

Svazek periodika

6

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

166-171

Kód UT WoS článku

000367251900023

EID výsledku v databázi Scopus

2-s2.0-84943597556