Transparent Conductive Oxide Bi-Layer as Front Contact for Multijunction Thin-Film Silicon Solar Cells
F.S. Saitta (TU Delft - Photovoltaic Materials and Devices)
Prashand Kalpoe (Student TU Delft)
G. Padmakumar (TU Delft - Photovoltaic Materials and Devices)
P. Perez-Rodriguez (TU Delft - Photovoltaic Materials and Devices)
Gianluca Limodio (TU Delft - QN/Kavli Nanolab Delft, TU Delft - Photovoltaic Materials and Devices)
R Santbergen (TU Delft - Photovoltaic Materials and Devices)
AHM Smets (TU Delft - Photovoltaic Materials and Devices)
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Abstract
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/cm2, 200°C and 2 W/cm2 for IOH and i-ZnO respectively.