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Color Controllability and Improved Performance of a-Si:H Transparent Solar Cells by Regulating the Conditions of Al2O3 Passivation Films
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- Authors
- Jung Wook Lim, Gayoung Kim, Myunghun Shin, Sun Jin Yun
- Issue Date
- 2017-09
- Citation
- European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) 2017, pp.1-4
- Language
- English
- Type
- Conference Paper
- Abstract
- To reduce greenhouse gases, it is required to increase the weight of renewable energy status. One of remarkable ways is to explore the building-integrated photovoltaic (BIPV) systems among which, transparent solar windows are expected to occupy substantial areas in the building. Although various candidates have been tried as solar windows, a-Si:H thin-film solar cells seems to have an unparalleled performances such as excellent stability and low barrier to enter mass production [1-2]. When solar windows are applied to the building, various exterior as well as interior colors is very important and have attracted considerable attention to fulfill the increasing demands for energy production as electricity generators and as aesthetically pleasing building parts. In order to embody various colors in a-Si:H transparent solar cells for solar windows, ultrathin transparent multi-layered electrode with low sheet resistance as low as 6 ohm/square has been applied as rear transparent conducting electrode (TCE) in our group [3]. Through this study, we have achieved a variety of colors such as red, violet, blue and green colors by just adjusting the thickness of rear TCE without varying absorbers [3]. Furthermore, it is required to form a passivation layer to protect rear TCE and absorbers from water vapor resulting in improving long-term stability. In general, it has been well known that Al2O3 films grown by ALD should be a novel solution [4]. In this study, we adopted Al2O3 films grown by plasma enhanced ALD (PEALD) as not only a passivation layer but also a color-controlling layer. In particular, in this manuscript, color controllability and improved performance of solar cells are dealt with.
- KSP Keywords
- Building-integrated photovoltaic systems(BIPV), Energy production, Layered electrode, Long term stability, Passivation film, Plasma-enhanced, Solar windows, Thin film solar cells, Transparent solar cells, Various colors, Water vapor