Numerical Simulations of Time-Resolved Photoluminescence in CdSexTe1-x/CdTe Solar Cells

John Moseley; Dmitry Krasikov; Darius Kuciauskas

doi:10.1109/PVSC45281.2020.9300736

Numerical Simulations of Time-Resolved Photoluminescence in CdSexTe1-x/CdTe Solar Cells

John Moseley, Dmitry Krasikov, Darius Kuciauskas

First Solar

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

4 Scopus Citations

Abstract

We present initial time-resolved photoluminescence (TRPL) simulations in graded CdSexTe1-e thin-film solar cells to quantify the front-interface recombination velocity, Sint,front. Our model includes several composition dependences: bandgap energy, absorption coefficient, electron affinity, and carrier lifetime. Cathodoluminescence spectrum imaging measurements on bevels provide an estimate of the bandgap and the CdSexTe1-x alloy composition through the absorber thickness. TRPL decays are simulated as a function of the laser power, Sint,front, front-interface band offset, and bulk Shockley-Read-Hall lifetime. We find the impact of Sintf,ront on the PL decay increases as the band offset shifts from a 'spike' to a 'cliff'. Recombination rate analysis shows that back-interface recombination could potentially dictate the later part of the TRPL decay 't2' in high-lifetime CdSexTe1-x cells. We briefly discuss ongoing work to determine TRPL measurement conditions that maximize sensitivity to Sitnt,front.

Original language	American English
Pages	2062-2065
Number of pages	4
DOIs	https://doi.org/10.1109/PVSC45281.2020.9300736 https://doi.org/10.1109/PVSC45281.2020.9300736
State	Published - 14 Jun 2020
Event	47th IEEE Photovoltaic Specialists Conference, PVSC 2020 - Calgary, Canada Duration: 15 Jun 2020 → 21 Aug 2020

Conference

Conference	47th IEEE Photovoltaic Specialists Conference, PVSC 2020
Country/Territory	Canada
City	Calgary
Period	15/06/20 → 21/08/20

Bibliographical note

Publisher Copyright:
© 2020 IEEE.

NREL Publication Number

NREL/CP-5K00-75931

Keywords

CdTe solar cells
interface recombination
time-resolved photoluminescence

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title = "Numerical Simulations of Time-Resolved Photoluminescence in CdSexTe1-x/CdTe Solar Cells",

abstract = "We present initial time-resolved photoluminescence (TRPL) simulations in graded CdSexTe1-e thin-film solar cells to quantify the front-interface recombination velocity, Sint,front. Our model includes several composition dependences: bandgap energy, absorption coefficient, electron affinity, and carrier lifetime. Cathodoluminescence spectrum imaging measurements on bevels provide an estimate of the bandgap and the CdSexTe1-x alloy composition through the absorber thickness. TRPL decays are simulated as a function of the laser power, Sint,front, front-interface band offset, and bulk Shockley-Read-Hall lifetime. We find the impact of Sintf,ront on the PL decay increases as the band offset shifts from a 'spike' to a 'cliff'. Recombination rate analysis shows that back-interface recombination could potentially dictate the later part of the TRPL decay 't2' in high-lifetime CdSexTe1-x cells. We briefly discuss ongoing work to determine TRPL measurement conditions that maximize sensitivity to Sitnt,front.",

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author = "John Moseley and Dmitry Krasikov and Darius Kuciauskas",

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doi = "10.1109/PVSC45281.2020.9300736",

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AU - Moseley, John

AU - Krasikov, Dmitry

AU - Kuciauskas, Darius

PY - 2020/6/14

Y1 - 2020/6/14

N2 - We present initial time-resolved photoluminescence (TRPL) simulations in graded CdSexTe1-e thin-film solar cells to quantify the front-interface recombination velocity, Sint,front. Our model includes several composition dependences: bandgap energy, absorption coefficient, electron affinity, and carrier lifetime. Cathodoluminescence spectrum imaging measurements on bevels provide an estimate of the bandgap and the CdSexTe1-x alloy composition through the absorber thickness. TRPL decays are simulated as a function of the laser power, Sint,front, front-interface band offset, and bulk Shockley-Read-Hall lifetime. We find the impact of Sintf,ront on the PL decay increases as the band offset shifts from a 'spike' to a 'cliff'. Recombination rate analysis shows that back-interface recombination could potentially dictate the later part of the TRPL decay 't2' in high-lifetime CdSexTe1-x cells. We briefly discuss ongoing work to determine TRPL measurement conditions that maximize sensitivity to Sitnt,front.

AB - We present initial time-resolved photoluminescence (TRPL) simulations in graded CdSexTe1-e thin-film solar cells to quantify the front-interface recombination velocity, Sint,front. Our model includes several composition dependences: bandgap energy, absorption coefficient, electron affinity, and carrier lifetime. Cathodoluminescence spectrum imaging measurements on bevels provide an estimate of the bandgap and the CdSexTe1-x alloy composition through the absorber thickness. TRPL decays are simulated as a function of the laser power, Sint,front, front-interface band offset, and bulk Shockley-Read-Hall lifetime. We find the impact of Sintf,ront on the PL decay increases as the band offset shifts from a 'spike' to a 'cliff'. Recombination rate analysis shows that back-interface recombination could potentially dictate the later part of the TRPL decay 't2' in high-lifetime CdSexTe1-x cells. We briefly discuss ongoing work to determine TRPL measurement conditions that maximize sensitivity to Sitnt,front.

KW - CdTe solar cells

KW - interface recombination

KW - time-resolved photoluminescence

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DO - 10.1109/PVSC45281.2020.9300736

M3 - Paper

AN - SCOPUS:85099567068

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T2 - 47th IEEE Photovoltaic Specialists Conference, PVSC 2020

Y2 - 15 June 2020 through 21 August 2020

ER -

Numerical Simulations of Time-Resolved Photoluminescence in CdSexTe1-x/CdTe Solar Cells

Abstract

Conference

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NREL Publication Number

Keywords

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