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Conference Paper
Bifacial, Colored, Transparent Thin-Film a-Si:H Solar Cells for Round-the-Clock Power Generation
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- Authors
- Gayoung Kim, Jung Wook Lim, Seong Hyun Lee, Sun Jin Yun, Myunghun Shin, Ganghoo Lee, Jeonghoo Jo
- Issue Date
- 2017-09
- Citation
- European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) 2017, pp.1-4
- Language
- English
- Type
- Conference Paper
- Abstract
- In recent decades, building-integrated photovoltaic (BIPV) systems have attracted considerable interest as a potential solution to fulfilling the increasing demands for electricity required in metropolitan areas. BIPV systems could be widely utilized in buildings, not only as windows, but also as transparent roofs, facades, and curtain walls. However, as buildings components, they need to be improved in many ways, and take into consideration such practical design and installation conditions as color, illumination, and lifetime. A particular advantage of BIPV windows is that they may be used to generate electricity in a bifacial fashion, using both sunlight and indoor lighting, simultaneously. Hydrogenated amorphous silicon thin-film solar cells (a-Si:H SCs), are promising candidates for use in such solar windows, as the a-Si:H SCs demonstrate superior operating performance in low illumination conditions ( < 1 sun, where 1 sun = 1 kW/m2) compared with conventional crystalline Si SCs or other thin film SCs [1]. Already, small and portable devices utilizing a-Si:H SCs are in commercial use, where they are powered under indoor lighting sources, such as light-emitting diodes (LEDs), and fluorescent lamps. This suggests that BIPV windows based on a-Si:H SCs are capable of generating electricity in a bifacial operation mode during daylight hours, and may continue to generate electricity in a rear-facial operation mode at nighttime, illuminated by indoor light sources. In addition, large-scale BIPV windows can be fabricated at low cost on large-scale glass substrates, and such Si-based cells exhibit high stability, as has already been well-proven in the field of solar energy, and the display and semiconductor industries [2]. In this study, we design and fabricate bifacial, colored, transparent a-Si:H solar cells for use in BIPV windows. Using two calibrated indoor illumination sources on the front- or rear-side, we investigate the cell performance with respect to different combinations of illumination sources. Furthermore, the reflected colors from both front- and rear-sides of the cell are investigated for each light source combination, and the resulting color of the solar windows is determined by considering both the type and color of the given light sources.
- KSP Keywords
- Building-integrated photovoltaic systems(BIPV), Curtain walls, Design and installation, Fluorescent lamp, Glass substrate, High stability, Hydrogenated amorphous silicon, Indoor illumination, Indoor lighting, Light source, Low illumination conditions