Analysis of absorption enhancement in tailor-made periodic polycrystalline silicon microarrays

作者：Preidel Veit^*; Lockau Daniel; Sontheimer Tobias; Back Franziska; Rudigier Voigt Eveline; Rech Bernd; Becker Christiane

来源：Physica Status Solidi-Rapid Research Letters, 2013, 7(12): 1045-1049.

DOI：10.1002/pssr.201308098

• polycrystalline materials
• silicon
• solar cells
• electron-beam evaporation
• light trapping
• nanoimprint lithography

We present a design study of 3D photonic poly-Si microarchitectures on 2 mu m periodically textured glass substrates for application as absorber layers in crystalline Si thin-film solar cells. Different arrays of microholes and microcones were fabricated in a low-cost process, by combining high rate electron beam evaporation, nanoimprint technology and self-organized solid phase crystallization. Two promising designs exhibiting strong absorption enhancement were identified by optical analysis. High angular acceptance and calculated maximum achievable short-circuit current density of 27.6 mA/cm(2) for an effective Si thickness of 1.1 mu m highlight the optical potential of these microarchitectures as broadband absorbers in polycrystalline Si thin-film solar cells.
[GRAPHICS]
Tailor-made 2 mu m periodic polycrystalline silicon micro-arrays on nanoimprint patterned glass substrates for an application as light harvesting architectures in polycrystalline Si thin-film solar cells.

• 出版日期2013-12