Ultimate Charge Extraction of Monolayer PbS Quantum Dot for Observation of Multiple Exciton Generation

So Yeon Park; Sehoon Han; Younghoon Kim; Sohee Jung; Dong Hoe Kim; Gill Sang Han; Hyun Suk Jung

doi:10.1002/cphc.201900381

Ultimate Charge Extraction of Monolayer PbS Quantum Dot for Observation of Multiple Exciton Generation

So Yeon Park, Sehoon Han, Younghoon Kim, Sohee Jung, Dong Hoe Kim, Gill Sang Han, Hyun Suk Jung

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

Abstract

Multiple exciton generation (MEG) has great potential to improve the Shockley-Queisser (S-Q) efficiency limitation for colloidal quantum dot (CQD) solar cells. However, MEG has rarely been observed in CQD solar cells because of the loss of carriers through the transport mechanism between adjacent QDs. Herein, we demonstrate that excess charge carriers produced via MEG can be efficiently extracted using monolayer PbS QDs. The monolayer PbS QDs solar cells exhibit α=1 in the light intensity dependence of the short-circuit current density J_sc (J_sc∝I^α) and an internal quantum efficiency (IQE) value of 100 % at 2.95 eV because of their very short charge extraction path. In addition, the measured MEG threshold is 2.23 times the bandgap energy (E_g), which is the lowest value in PbS QD solar cells. We believe that this approach can provide a simple method to find suitable CQD materials and design interface engineering for MEG.

Original language	English
Pages (from-to)	2657-2661
Number of pages	5
Journal	ChemPhysChem
Volume	20
Issue number	20
DOIs	https://doi.org/10.1002/cphc.201900381
Publication status	Published - 2019 Oct 16
Externally published	Yes

Keywords

Langmuir–Blodgett
colloid quantum dot solar cell
fast charge extraction
monolayer PbS
multiple exciton generation

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Physical and Theoretical Chemistry

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10.1002/cphc.201900381

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title = "Ultimate Charge Extraction of Monolayer PbS Quantum Dot for Observation of Multiple Exciton Generation",

abstract = "Multiple exciton generation (MEG) has great potential to improve the Shockley-Queisser (S-Q) efficiency limitation for colloidal quantum dot (CQD) solar cells. However, MEG has rarely been observed in CQD solar cells because of the loss of carriers through the transport mechanism between adjacent QDs. Herein, we demonstrate that excess charge carriers produced via MEG can be efficiently extracted using monolayer PbS QDs. The monolayer PbS QDs solar cells exhibit α=1 in the light intensity dependence of the short-circuit current density Jsc (Jsc∝Iα) and an internal quantum efficiency (IQE) value of 100 % at 2.95 eV because of their very short charge extraction path. In addition, the measured MEG threshold is 2.23 times the bandgap energy (Eg), which is the lowest value in PbS QD solar cells. We believe that this approach can provide a simple method to find suitable CQD materials and design interface engineering for MEG.",

keywords = "Langmuir–Blodgett, colloid quantum dot solar cell, fast charge extraction, monolayer PbS, multiple exciton generation",

author = "Park, {So Yeon} and Sehoon Han and Younghoon Kim and Sohee Jung and Kim, {Dong Hoe} and Han, {Gill Sang} and Jung, {Hyun Suk}",

note = "Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2017R1 A2B3010927), the Global Frontier R&D Program on Center for Multiscale Energy System (2012 M3 A6 A7054855), the Future Materials Discovery Program (2016 M3D1 A1027664), and the Ministry of Education (2018R1D1 A1B07050694). Publisher Copyright: {\textcopyright} 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2019",

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doi = "10.1002/cphc.201900381",

language = "English",

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journal = "ChemPhysChem",

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AU - Park, So Yeon

AU - Han, Sehoon

AU - Kim, Younghoon

AU - Jung, Sohee

AU - Kim, Dong Hoe

AU - Han, Gill Sang

AU - Jung, Hyun Suk

N1 - Funding Information: This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2017R1 A2B3010927), the Global Frontier R&D Program on Center for Multiscale Energy System (2012 M3 A6 A7054855), the Future Materials Discovery Program (2016 M3D1 A1027664), and the Ministry of Education (2018R1D1 A1B07050694). Publisher Copyright: © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2019/10/16

Y1 - 2019/10/16

N2 - Multiple exciton generation (MEG) has great potential to improve the Shockley-Queisser (S-Q) efficiency limitation for colloidal quantum dot (CQD) solar cells. However, MEG has rarely been observed in CQD solar cells because of the loss of carriers through the transport mechanism between adjacent QDs. Herein, we demonstrate that excess charge carriers produced via MEG can be efficiently extracted using monolayer PbS QDs. The monolayer PbS QDs solar cells exhibit α=1 in the light intensity dependence of the short-circuit current density Jsc (Jsc∝Iα) and an internal quantum efficiency (IQE) value of 100 % at 2.95 eV because of their very short charge extraction path. In addition, the measured MEG threshold is 2.23 times the bandgap energy (Eg), which is the lowest value in PbS QD solar cells. We believe that this approach can provide a simple method to find suitable CQD materials and design interface engineering for MEG.

AB - Multiple exciton generation (MEG) has great potential to improve the Shockley-Queisser (S-Q) efficiency limitation for colloidal quantum dot (CQD) solar cells. However, MEG has rarely been observed in CQD solar cells because of the loss of carriers through the transport mechanism between adjacent QDs. Herein, we demonstrate that excess charge carriers produced via MEG can be efficiently extracted using monolayer PbS QDs. The monolayer PbS QDs solar cells exhibit α=1 in the light intensity dependence of the short-circuit current density Jsc (Jsc∝Iα) and an internal quantum efficiency (IQE) value of 100 % at 2.95 eV because of their very short charge extraction path. In addition, the measured MEG threshold is 2.23 times the bandgap energy (Eg), which is the lowest value in PbS QD solar cells. We believe that this approach can provide a simple method to find suitable CQD materials and design interface engineering for MEG.

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Ultimate Charge Extraction of Monolayer PbS Quantum Dot for Observation of Multiple Exciton Generation

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Keywords

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