Abstract
Glass texturing by sandblasting or cream etching methods was introduced for the light trapping purpose for a-Si/mc-Si thin-film tandem solar cells. The nm-scale features of transparent conductive oxide (TCO) front electrode and μm-scale features of textured glass form a multi-scale texturing scheme, which is potentially beneficial to the longer wavelength absorption in mc-Si cell and hence increase the total current of the tandem solar cell. Conformal growth model was applied successfully to analyze thin film growth on textured glass in this work. Power conversion efficiency improvements of ∼1.0% and ∼0.8% have been achieved with solar cells on sandblasting and cream-etching textured glass, respectively.
Highlights
The a-Si/mc-Si thin-film tandem solar cells have been investigated for the past couple of years
Superstrate (glass/transparent conductive oxide (TCO)) can improve cell efficiency through modified reflection properties at interfaces or increased transmission or light trapping in the high-index Si layers.[2,3,4,5,6]
Multi-large-scale texture offers some improvements over single-scale texture for light trapping
Summary
The a-Si/mc-Si thin-film tandem solar cells have been investigated for the past couple of years. The improvement of conversion efficiency is crucial to the future potential market of a-Si/mc-Si thin-film tandem solar modules. Superstrate (glass/transparent conductive oxide (TCO)) can improve cell efficiency through modified reflection properties at interfaces or increased transmission or light trapping in the high-index Si layers.[2,3,4,5,6] In industry, light trapping is normally realized with textured TCO on flat glass, eg. Artificial periodic textures have received much interest by showing the potential more light trapping enhancement over random textures.[9] Desired periodic textures can be made on industrial scale by nano-imprinting lithography.[10] Multi-scale light-trapping scheme has been introduced to improve light trapping in multi-crystalline Si wafer based solar cells - “black Si”.11. Si thin film growth mechanisms on textured glass and electrical results for the Si tandem solar cells were discussed
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