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

Saitta, F.S.; Kalpoe, Prashand; Padmakumar, G.; Perez Rodriguez, Paula; Limodio, Gianluca; Santbergen, R; Smets, Arno

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

Conference paper (2023)

Authors

F.S. Saitta Photovoltaic Materials and Devices -

Prashand Kalpoe Student

G. Padmakumar Photovoltaic Materials and Devices -

Paula Perez Rodriguez Photovoltaic Materials and Devices -

Gianluca Limodio QN/Kavli Nanolab Delft - , Photovoltaic Materials and Devices -

R Santbergen Photovoltaic Materials and Devices -

Arno Smets Photovoltaic Materials and Devices -

Research Group

Photovoltaic Materials and Devices () (TU Delft)

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Published Date

2023

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

Photovoltaic Materials and Devices

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.

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