Combinatorial Study of MZO Emitters for CdTe-Based Solar Cells

Andriy Zakutayev; Matthew Reese; Yegor Samoilenko; Gavin Yeung; Colin Wolden

doi:10.1109/PVSC40753.2019.8980695

Combinatorial Study of MZO Emitters for CdTe-Based Solar Cells

Andriy Zakutayev, Matthew Reese, Yegor Samoilenko, Gavin Yeung, Colin Wolden

Materials Science

Colorado School of Mines

Research output: Contribution to conference › Paper › peer-review

4 Scopus Citations

Abstract

Precise band alignment at the front interface of CdTe-based solar cells is necessary to reduce photoexcited charge carrier recombination and to enable higher energy conversion efficiencies. Magnesium zinc oxide is not only transparent but also offers the ability to tune the conduction band offset with CdTe at the front of the device stack. In this work, we describe reactive sputtering of Mg_1-xZn_xO using metal targets and its application in CdTe photovoltaics. Combinatorial libraries of Mg_1-xZn_xO were created to tune the conduction band alignment for the optimal performance of CdTe solar cells. Band gap variation of more than 0.4 eV is achieved across a 3-inch substrate. Kelvin probe measurements demonstrate variance of work function across the substrate. Device performance is optimized at band gaps of 3.5 eV for the CdTe device processing conditions employed in this study.

Original language	American English
Pages	2498-2502
Number of pages	5
DOIs	https://doi.org/10.1109/PVSC40753.2019.8980695 https://doi.org/10.1109/PVSC40753.2019.8980695
State	Published - Jun 2019
Event	46th IEEE Photovoltaic Specialists Conference, PVSC 2019 - Chicago, United States Duration: 16 Jun 2019 → 21 Jun 2019

Conference

Conference	46th IEEE Photovoltaic Specialists Conference, PVSC 2019
Country/Territory	United States
City	Chicago
Period	16/06/19 → 21/06/19

Bibliographical note

Publisher Copyright:
© 2019 IEEE.

NREL Publication Number

NREL/CP-5K00-76336

Keywords

band alignment
buffer layer
cadmium telluride
Kelvin probe
magnesium zinc oxide

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Cite this

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title = "Combinatorial Study of MZO Emitters for CdTe-Based Solar Cells",

abstract = "Precise band alignment at the front interface of CdTe-based solar cells is necessary to reduce photoexcited charge carrier recombination and to enable higher energy conversion efficiencies. Magnesium zinc oxide is not only transparent but also offers the ability to tune the conduction band offset with CdTe at the front of the device stack. In this work, we describe reactive sputtering of Mg1-xZnxO using metal targets and its application in CdTe photovoltaics. Combinatorial libraries of Mg1-xZnxO were created to tune the conduction band alignment for the optimal performance of CdTe solar cells. Band gap variation of more than 0.4 eV is achieved across a 3-inch substrate. Kelvin probe measurements demonstrate variance of work function across the substrate. Device performance is optimized at band gaps of 3.5 eV for the CdTe device processing conditions employed in this study.",

keywords = "band alignment, buffer layer, cadmium telluride, Kelvin probe, magnesium zinc oxide",

author = "Andriy Zakutayev and Matthew Reese and Yegor Samoilenko and Gavin Yeung and Colin Wolden",

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AU - Zakutayev, Andriy

AU - Reese, Matthew

AU - Samoilenko, Yegor

AU - Yeung, Gavin

AU - Wolden, Colin

PY - 2019/6

Y1 - 2019/6

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AB - Precise band alignment at the front interface of CdTe-based solar cells is necessary to reduce photoexcited charge carrier recombination and to enable higher energy conversion efficiencies. Magnesium zinc oxide is not only transparent but also offers the ability to tune the conduction band offset with CdTe at the front of the device stack. In this work, we describe reactive sputtering of Mg1-xZnxO using metal targets and its application in CdTe photovoltaics. Combinatorial libraries of Mg1-xZnxO were created to tune the conduction band alignment for the optimal performance of CdTe solar cells. Band gap variation of more than 0.4 eV is achieved across a 3-inch substrate. Kelvin probe measurements demonstrate variance of work function across the substrate. Device performance is optimized at band gaps of 3.5 eV for the CdTe device processing conditions employed in this study.

KW - band alignment

KW - buffer layer

KW - cadmium telluride

KW - Kelvin probe

KW - magnesium zinc oxide

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Combinatorial Study of MZO Emitters for CdTe-Based Solar Cells

Abstract

Conference

Bibliographical note

NREL Publication Number

Keywords

Access to Document

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