Photovoltaic-targeted photoluminescence lifetime engineering in bright type-II alloy quantum dots

Qinghua Li; Xiao Jin; Yin Yang; Zihan Chen; Degui Kong; Chao Nie; Haiyang Li; Yinglin Song

doi:10.1016/j.solener.2018.04.034

Photovoltaic-targeted photoluminescence lifetime engineering in bright type-II alloy quantum dots

Qinghua Li^*
, Xiao Jin
, Yin Yang
, Zihan Chen
, Degui Kong
, Chao Nie
, Haiyang Li
, Yinglin Song

^*Corresponding author for this work

School of Physics

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

A crucial issue faced by quantum dot solar cells (QDSC) is how to achieve a quantum dot material with high photoluminescence (PL) quantum yield and long excited state lifetime at the same time to maximize charge carrier collection efficiency. Here, we present a new type of Zn_0.9Cd_0.1S/ZnSe hetero-nanocrystals that have a staggered band alignment, i.e., a type-II structure by which the wave function overlap between electrons and holes is reduced, thereby leading to a significant enhancement in the PL lifetime. The resultant QD also exhibits a QY up to 75.4%, which is, to the best of our knowledge, the highest one for a type-II QD to date. In particular, we explore the underlying relationship between the broad tunability and energy level alignment of these hetero-nanocrystals, and we highlight the properties that have delivered QDSCs and light-emitting diodes.

Original language	English
Pages (from-to)	75-83
Number of pages	9
Journal	Solar Energy
Volume	169
DOIs	https://doi.org/10.1016/j.solener.2018.04.034
State	Published - 15 Jul 2018

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Charge transport
Excited state lifetime
Quantum dot solar cells
Type-II quantum dots

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10.1016/j.solener.2018.04.034

Cite this

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title = "Photovoltaic-targeted photoluminescence lifetime engineering in bright type-II alloy quantum dots",

abstract = "A crucial issue faced by quantum dot solar cells (QDSC) is how to achieve a quantum dot material with high photoluminescence (PL) quantum yield and long excited state lifetime at the same time to maximize charge carrier collection efficiency. Here, we present a new type of Zn0.9Cd0.1S/ZnSe hetero-nanocrystals that have a staggered band alignment, i.e., a type-II structure by which the wave function overlap between electrons and holes is reduced, thereby leading to a significant enhancement in the PL lifetime. The resultant QD also exhibits a QY up to 75.4\%, which is, to the best of our knowledge, the highest one for a type-II QD to date. In particular, we explore the underlying relationship between the broad tunability and energy level alignment of these hetero-nanocrystals, and we highlight the properties that have delivered QDSCs and light-emitting diodes.",

keywords = "Charge transport, Excited state lifetime, Quantum dot solar cells, Type-II quantum dots",

author = "Qinghua Li and Xiao Jin and Yin Yang and Zihan Chen and Degui Kong and Chao Nie and Haiyang Li and Yinglin Song",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = jul,

day = "15",

doi = "10.1016/j.solener.2018.04.034",

language = "英语",

volume = "169",

pages = "75--83",

journal = "Solar Energy",

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TY - JOUR

T1 - Photovoltaic-targeted photoluminescence lifetime engineering in bright type-II alloy quantum dots

AU - Li, Qinghua

AU - Jin, Xiao

AU - Yang, Yin

AU - Chen, Zihan

AU - Kong, Degui

AU - Nie, Chao

AU - Li, Haiyang

AU - Song, Yinglin

PY - 2018/7/15

Y1 - 2018/7/15

N2 - A crucial issue faced by quantum dot solar cells (QDSC) is how to achieve a quantum dot material with high photoluminescence (PL) quantum yield and long excited state lifetime at the same time to maximize charge carrier collection efficiency. Here, we present a new type of Zn0.9Cd0.1S/ZnSe hetero-nanocrystals that have a staggered band alignment, i.e., a type-II structure by which the wave function overlap between electrons and holes is reduced, thereby leading to a significant enhancement in the PL lifetime. The resultant QD also exhibits a QY up to 75.4%, which is, to the best of our knowledge, the highest one for a type-II QD to date. In particular, we explore the underlying relationship between the broad tunability and energy level alignment of these hetero-nanocrystals, and we highlight the properties that have delivered QDSCs and light-emitting diodes.

AB - A crucial issue faced by quantum dot solar cells (QDSC) is how to achieve a quantum dot material with high photoluminescence (PL) quantum yield and long excited state lifetime at the same time to maximize charge carrier collection efficiency. Here, we present a new type of Zn0.9Cd0.1S/ZnSe hetero-nanocrystals that have a staggered band alignment, i.e., a type-II structure by which the wave function overlap between electrons and holes is reduced, thereby leading to a significant enhancement in the PL lifetime. The resultant QD also exhibits a QY up to 75.4%, which is, to the best of our knowledge, the highest one for a type-II QD to date. In particular, we explore the underlying relationship between the broad tunability and energy level alignment of these hetero-nanocrystals, and we highlight the properties that have delivered QDSCs and light-emitting diodes.

KW - Charge transport

KW - Excited state lifetime

KW - Quantum dot solar cells

KW - Type-II quantum dots

UR - https://www.scopus.com/pages/publications/85046034441

U2 - 10.1016/j.solener.2018.04.034

DO - 10.1016/j.solener.2018.04.034

M3 - 文章

AN - SCOPUS:85046034441

SN - 0038-092X

VL - 169

SP - 75

EP - 83

JO - Solar Energy

JF - Solar Energy

ER -

Photovoltaic-targeted photoluminescence lifetime engineering in bright type-II alloy quantum dots

Abstract

UN SDGs

Keywords

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