Ultrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better

Jessica Eid; Anwar Usman; Issam Gereige; Jeroen Van Duren; Vadim Lyssenko; Karl Leo; Omar F. Mohammed

doi:10.1016/j.solmat.2015.03.029

Ultrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better

Jessica Eid, Anwar Usman, Issam Gereige, Jeroen Van Duren, Vadim Lyssenko, Karl Leo, Omar F. Mohammed

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

16 Scopus citations

Abstract

Although Cu(In,Ga)Se2 (CIGS) solar cells have the highest efficiency of any thin-film solar cell, especially when sodium is incorporated, the fundamental device properties of ultrafast carrier transport and recombination in such cells remain not fully understood. Here, we explore the dynamics of charge carriers in CIGS absorber layers with varying concentrations of Na by femtosecond (fs) broadband pump-probe reflectance spectroscopy with 120 fs time resolution. By analyzing the time-resolved transient spectra in a different time domain, we show that a small amount of Na integrated by NaF deposition on top of sputtered Cu(In,Ga) prior to selenization forms CIGS, which induces slower recombination of the excited carriers. Here, we provide direct evidence for the elongation of carrier lifetimes by incorporating Na into CIGS.

Original language	English (US)
Pages (from-to)	33-37
Number of pages	5
Journal	Solar Energy Materials and Solar Cells
Volume	140
DOIs	https://doi.org/10.1016/j.solmat.2015.03.029
State	Published - Apr 14 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01

ASJC Scopus subject areas

Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment

UN SDGs

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

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10.1016/j.solmat.2015.03.029

https://repository.kaust.edu.sa/bitstream/10754/575353/2/Eid%20et%20al-CIGS-revised-Final.pdf

Cite this

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title = "Ultrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better",

abstract = "Although Cu(In,Ga)Se2 (CIGS) solar cells have the highest efficiency of any thin-film solar cell, especially when sodium is incorporated, the fundamental device properties of ultrafast carrier transport and recombination in such cells remain not fully understood. Here, we explore the dynamics of charge carriers in CIGS absorber layers with varying concentrations of Na by femtosecond (fs) broadband pump-probe reflectance spectroscopy with 120 fs time resolution. By analyzing the time-resolved transient spectra in a different time domain, we show that a small amount of Na integrated by NaF deposition on top of sputtered Cu(In,Ga) prior to selenization forms CIGS, which induces slower recombination of the excited carriers. Here, we provide direct evidence for the elongation of carrier lifetimes by incorporating Na into CIGS.",

author = "Jessica Eid and Anwar Usman and Issam Gereige and Duren, {Jeroen Van} and Vadim Lyssenko and Karl Leo and Mohammed, {Omar F.}",

note = "KAUST Repository Item: Exported on 2020-10-01",

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doi = "10.1016/j.solmat.2015.03.029",

language = "English (US)",

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journal = "Solar Energy Materials and Solar Cells",

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T1 - Ultrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better

AU - Eid, Jessica

AU - Usman, Anwar

AU - Gereige, Issam

AU - Duren, Jeroen Van

AU - Lyssenko, Vadim

AU - Leo, Karl

AU - Mohammed, Omar F.

N1 - KAUST Repository Item: Exported on 2020-10-01

PY - 2015/4/14

Y1 - 2015/4/14

N2 - Although Cu(In,Ga)Se2 (CIGS) solar cells have the highest efficiency of any thin-film solar cell, especially when sodium is incorporated, the fundamental device properties of ultrafast carrier transport and recombination in such cells remain not fully understood. Here, we explore the dynamics of charge carriers in CIGS absorber layers with varying concentrations of Na by femtosecond (fs) broadband pump-probe reflectance spectroscopy with 120 fs time resolution. By analyzing the time-resolved transient spectra in a different time domain, we show that a small amount of Na integrated by NaF deposition on top of sputtered Cu(In,Ga) prior to selenization forms CIGS, which induces slower recombination of the excited carriers. Here, we provide direct evidence for the elongation of carrier lifetimes by incorporating Na into CIGS.

AB - Although Cu(In,Ga)Se2 (CIGS) solar cells have the highest efficiency of any thin-film solar cell, especially when sodium is incorporated, the fundamental device properties of ultrafast carrier transport and recombination in such cells remain not fully understood. Here, we explore the dynamics of charge carriers in CIGS absorber layers with varying concentrations of Na by femtosecond (fs) broadband pump-probe reflectance spectroscopy with 120 fs time resolution. By analyzing the time-resolved transient spectra in a different time domain, we show that a small amount of Na integrated by NaF deposition on top of sputtered Cu(In,Ga) prior to selenization forms CIGS, which induces slower recombination of the excited carriers. Here, we provide direct evidence for the elongation of carrier lifetimes by incorporating Na into CIGS.

UR - http://hdl.handle.net/10754/575353

UR - http://linkinghub.elsevier.com/retrieve/pii/S092702481500152X

UR - http://www.scopus.com/inward/record.url?scp=84953923541&partnerID=8YFLogxK

U2 - 10.1016/j.solmat.2015.03.029

DO - 10.1016/j.solmat.2015.03.029

M3 - Article

SN - 0927-0248

VL - 140

SP - 33

EP - 37

JO - Solar Energy Materials and Solar Cells

JF - Solar Energy Materials and Solar Cells

ER -

Ultrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better

Abstract

Bibliographical note

ASJC Scopus subject areas

UN SDGs

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