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Mapping Shunting Paths at the Surface of Cu2ZnSn(S,Se)4 Films via Energy-Filtered Photoemission Microscopy

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Mapping Shunting Paths at the Surface of Cu2ZnSn(S,Se)4 Films via Energy-Filtered Photoemission Microscopy. / Tiwari, Devendra; Cattelan, Mattia; Bowers, Jake; Fox, Neil; Abbas, AA; Sarua, Andrei; Harniman, Robert; Fermin, David.

In: iScience, Vol. 9, 01.11.2018, p. 36-46.

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@article{e7d3bbce85b24815ac7dd5621b0ad2b3,
title = "Mapping Shunting Paths at the Surface of Cu2ZnSn(S,Se)4 Films via Energy-Filtered Photoemission Microscopy",
abstract = "The performance of Cu2ZnSn(S,Se)4 thin-film solar cells, commonly referred to as kesterite or CZTSSe, is limited by open-circuit voltage (VOC) values less than 60{\%} of the maximum theoretical limit. In the present study, we employ energy-filtered photoemission microscopy to visualize nanoscale shunting paths in solution-processed CZTSSe films, which limit the VOC of cells to approximately 400 mV. These studies unveil areas of local effective work function (LEWF) narrowly distributed around 4.9 eV, whereas other portions show hotspots with LEWF as low as 4.2 eV. Localized valence band spectra and density functional theory calculations allow rationalizing the LEWF maps in terms of the CZTSSe effective work function broadened by potential energy fluctuations and nanoscale Sn(S,Se) phases.",
author = "Devendra Tiwari and Mattia Cattelan and Jake Bowers and Neil Fox and AA Abbas and Andrei Sarua and Robert Harniman and David Fermin",
year = "2018",
month = "11",
day = "1",
doi = "10.1016/j.isci.2018.10.004",
language = "English",
volume = "9",
pages = "36--46",
journal = "iScience",
issn = "2589-0042",

}

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TY - JOUR

T1 - Mapping Shunting Paths at the Surface of Cu2ZnSn(S,Se)4 Films via Energy-Filtered Photoemission Microscopy

AU - Tiwari, Devendra

AU - Cattelan, Mattia

AU - Bowers, Jake

AU - Fox, Neil

AU - Abbas, AA

AU - Sarua, Andrei

AU - Harniman, Robert

AU - Fermin, David

PY - 2018/11/1

Y1 - 2018/11/1

N2 - The performance of Cu2ZnSn(S,Se)4 thin-film solar cells, commonly referred to as kesterite or CZTSSe, is limited by open-circuit voltage (VOC) values less than 60% of the maximum theoretical limit. In the present study, we employ energy-filtered photoemission microscopy to visualize nanoscale shunting paths in solution-processed CZTSSe films, which limit the VOC of cells to approximately 400 mV. These studies unveil areas of local effective work function (LEWF) narrowly distributed around 4.9 eV, whereas other portions show hotspots with LEWF as low as 4.2 eV. Localized valence band spectra and density functional theory calculations allow rationalizing the LEWF maps in terms of the CZTSSe effective work function broadened by potential energy fluctuations and nanoscale Sn(S,Se) phases.

AB - The performance of Cu2ZnSn(S,Se)4 thin-film solar cells, commonly referred to as kesterite or CZTSSe, is limited by open-circuit voltage (VOC) values less than 60% of the maximum theoretical limit. In the present study, we employ energy-filtered photoemission microscopy to visualize nanoscale shunting paths in solution-processed CZTSSe films, which limit the VOC of cells to approximately 400 mV. These studies unveil areas of local effective work function (LEWF) narrowly distributed around 4.9 eV, whereas other portions show hotspots with LEWF as low as 4.2 eV. Localized valence band spectra and density functional theory calculations allow rationalizing the LEWF maps in terms of the CZTSSe effective work function broadened by potential energy fluctuations and nanoscale Sn(S,Se) phases.

U2 - 10.1016/j.isci.2018.10.004

DO - 10.1016/j.isci.2018.10.004

M3 - Article

VL - 9

SP - 36

EP - 46

JO - iScience

JF - iScience

SN - 2589-0042

ER -