Transparent Conductive Oxide Bi-Layer as Front Contact for Multijunction Thin-Film Silicon Solar Cells

Transparent conductive oxides (TCOs) are used as front electrode of thin film silicon (TF-Si) solar cells to increase power conversion efficiency. Metal oxides doped with different materials can be deployed as TCO. The preferred TCO is usually selected using a trade-off between transparency and cond...

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Bibliographic Details
Published in:	2023 IEEE 50th Photovoltaic Specialists Conference (PVSC) pp. 1 - 3
Main Authors:	Saitta, Federica, Kalpoe, Prashand, Padmakumar, Govind, Perez-Rodriguez, Paula, Limodio, Gianluca, Santbergen, Rudi, Smets, Arno H.M.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 11-06-2023
Subjects:	Absorption Annealing Density measurement Electrodes Photovoltaic cells Power system measurements Temperature
Online Access:	Get full text
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Summary:	Transparent conductive oxides (TCOs) are used as front electrode of thin film silicon (TF-Si) solar cells to increase power conversion efficiency. Metal oxides doped with different materials can be deployed as TCO. The preferred TCO is usually selected using a trade-off between transparency and conductivity. This work proposes a bi-layer front contact to address the limitation of this trade-off. IOH and i-ZnO are chosen as the best candidates for such architecture due to their good opto-electrical properties. A thin layer of IOH ensures good lateral conductivity and high transparency in the visible part of the solar spectrum. An additional i-ZnO layer provides minimized parasitic absorption losses along with low transverse resistivity. The best opto-electrical properties are achieved when deposition temperature and power density are set at 25°C and 1.5 W/cm 2 , 200°C and 2 W/cm 2 for IOH and i-ZnO respectively.
DOI:	10.1109/PVSC48320.2023.10359646