TY - GEN
T1 - Optimization of front TCO layer of silicon heterojunction solar cells for tandem applications
AU - Leilaeioun, Mehdi
AU - Yu, Zhengshan
AU - Holman, Zachary
N1 - Funding Information:
The information, data, or work presented herein was funded in part by the Engineering Research Center Program of the National Science Foundation and the Office of Energy Efficiency and Renewable Energy of the Department of Energy under NSF Cooperative Agreement No. EEC ϋ 1041895. Funding was also provided by the National Science Foundation under award No. 1509864.
Publisher Copyright:
© 2017 IEEE.
PY - 2017
Y1 - 2017
N2 - 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 2.5x1020 cm-3, the total loss over the wavelength range of 700-1100 nm is minimized by using a finger spacing of 3 mm and ITO thickness of 100-110 nm.
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 2.5x1020 cm-3, the total loss over the wavelength range of 700-1100 nm is minimized by using a finger spacing of 3 mm and ITO thickness of 100-110 nm.
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U2 - 10.1109/PVSC.2017.8366090
DO - 10.1109/PVSC.2017.8366090
M3 - Conference contribution
AN - SCOPUS:85048505289
T3 - 2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
SP - 2482
EP - 2487
BT - 2017 IEEE 44th Photovoltaic Specialist Conference, PVSC 2017
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 44th IEEE Photovoltaic Specialist Conference, PVSC 2017
Y2 - 25 June 2017 through 30 June 2017
ER -