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Thermal Insulation Properties of Transparent a-Si:H Thin Film Solar Cells
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- Authors
- Jung Wook Lim, Gayoung Kim, Sun Jin Yun
- Issue Date
- 2017-06
- Citation
- International Forum on Functional Materials (IFFM) 2017, pp.1-2
- Language
- English
- Type
- Conference Paper
- Abstract
- To combat global warming, various technologies are emerging, and among them, solar windows for BIPV(building integrated photovoltaics) are getting spotlighted [1]. In the fabrication of solar windows, long term stability and reproducibility at large area are important factors, and hence a-Si:H thin film solar cells seem to be the most appropriate. In our group, using transparent multi-layered electrodes (TMEs), various colors have been implemented in a-Si:H transparent solar cells for satisfying aesthetic demands [2]. Another important factor that must fulfill is the function of thermal insulation in the application of solar windows. Those properties depend on the ability to block the infrared (IR) regions. We fabricated a-Si:H solar cells with the structure of glass/TMEs(B)/p-i-n a-Si:H/TMEs(T) where thickness of i-Si and TMEs is as thin as 200 nm and around 200 nm, respectively to secure transparency. (B and T denote bottom and top, respectively) The thickness of TMEs(T) was varied from 90 to 220 nm and various colors were obtained as shown in Fig. 1. Except the thickness of TMEs(T), all conditions were identical. The efficiencies of them were 4.1, 3.9, 3.4, 3.6 and 4.3 %, respectively from the lower thickness of TMEs(T). Figure 2 shows the transmission spectra in the IR region and average transmittance (Tave) in this region (800 to 1500 nm) are ranged from 6.6 to 11.2 % which show effective IR blocking ability. The solar cell with 90 nm thick top TMEs shows the minimum Tave of 6.6 %, where effective reflection of infrared was achieved due to optical interference. The better thing is that a solar cell with 90 nm-TMEs also shows high efficiencies compared to other cells and thus it is the optimum condition for the application of solar windows.
- KSP Keywords
- 20 nm, As 2, Blocking ability, Building-integrated photovoltaic systems(BIPV), Global warming, Optimum condition, P-i-n, Solar windows, Thermal insulation properties, Thin film solar cells, Transmission spectra