Optimization of front TCO layer of silicon heterojunction solar cells for tandem applications

Mehdi Leilaeioun; Zhengshan Yu; Zachary Holman

doi:10.1109/PVSC.2016.7749687

Optimization of front TCO layer of silicon heterojunction solar cells for tandem applications

Mehdi Leilaeioun, Zhengshan Yu, Zachary Holman

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

5 Scopus citations

Abstract

The front transparent conductive oxide (TCO) layers of silicon heterojunction solar cells need to be optimized electrically and optically to minimize losses due to sheet resistance and free carrier absorption. This optimization has already investigated for the wavelength range of 300-1100 nm, but not for the projected wavelength range of 700-1100 nm for a silicon cell that is applied in a tandem structure as the bottom cell. Here, we demonstrate a routine for determining the total loss associated with the front TCO layer and employ it to determine which carrier density, mobility, and finger pitch combinations minimize loss. For a representative ITO film with a mobility of approximately 20 cm²/Vs and a carrier density of approximately 2.5×10²⁰ cm^-3, the total loss over the wavelength range of 700-1100 nm is minimized by using a linger spacing of 3 mm and ITO thickness of 100-110 nm.

Original language	English (US)
Title of host publication	2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	681-684
Number of pages	4
Volume	2016-November
ISBN (Electronic)	9781509027248
DOIs	https://doi.org/10.1109/PVSC.2016.7749687
State	Published - Nov 18 2016
Event	43rd IEEE Photovoltaic Specialists Conference, PVSC 2016 - Portland, United States Duration: Jun 5 2016 → Jun 10 2016

Other

Other	43rd IEEE Photovoltaic Specialists Conference, PVSC 2016
Country	United States
City	Portland
Period	6/5/16 → 6/10/16

ASJC Scopus subject areas

Control and Systems Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

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Optimization of front TCO layer of silicon heterojunction solar cells for tandem applications. / Leilaeioun, Mehdi; Yu, Zhengshan ; Holman, Zachary.

2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016. Vol. 2016-November Institute of Electrical and Electronics Engineers Inc., 2016. p. 681-684 7749687.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Leilaeioun, M, Yu, Z & Holman, Z 2016, Optimization of front TCO layer of silicon heterojunction solar cells for tandem applications. in 2016 IEEE 43rd Photovoltaic Specialists Conference, PVSC 2016. vol. 2016-November, 7749687, Institute of Electrical and Electronics Engineers Inc., pp. 681-684, 43rd IEEE Photovoltaic Specialists Conference, PVSC 2016, Portland, United States, 6/5/16. https://doi.org/10.1109/PVSC.2016.7749687

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title = "Optimization of front TCO layer of silicon heterojunction solar cells for tandem applications",

abstract = "The front transparent conductive oxide (TCO) layers of silicon heterojunction solar cells need to be optimized electrically and optically to minimize losses due to sheet resistance and free carrier absorption. This optimization has already investigated for the wavelength range of 300-1100 nm, but not for the projected wavelength range of 700-1100 nm for a silicon cell that is applied in a tandem structure as the bottom cell. Here, we demonstrate a routine for determining the total loss associated with the front TCO layer and employ it to determine which carrier density, mobility, and finger pitch combinations minimize loss. For a representative ITO film with a mobility of approximately 20 cm2/Vs and a carrier density of approximately 2.5×1020 cm-3, the total loss over the wavelength range of 700-1100 nm is minimized by using a linger spacing of 3 mm and ITO thickness of 100-110 nm.",

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note = "43rd IEEE Photovoltaic Specialists Conference, PVSC 2016 ; Conference date: 05-06-2016 Through 10-06-2016",

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AB - The front transparent conductive oxide (TCO) layers of silicon heterojunction solar cells need to be optimized electrically and optically to minimize losses due to sheet resistance and free carrier absorption. This optimization has already investigated for the wavelength range of 300-1100 nm, but not for the projected wavelength range of 700-1100 nm for a silicon cell that is applied in a tandem structure as the bottom cell. Here, we demonstrate a routine for determining the total loss associated with the front TCO layer and employ it to determine which carrier density, mobility, and finger pitch combinations minimize loss. For a representative ITO film with a mobility of approximately 20 cm2/Vs and a carrier density of approximately 2.5×1020 cm-3, the total loss over the wavelength range of 700-1100 nm is minimized by using a linger spacing of 3 mm and ITO thickness of 100-110 nm.

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Optimization of front TCO layer of silicon heterojunction solar cells for tandem applications

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