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A More Than 18% Efficiency Hit Structure a-Si/c-Si Solar Cell Using Artificially Constructed Junction (ACJ)

  • Y. Kuwano (a1), S. Nakano (a1), M. Tanaka (a1), T. Takahama (a1), T. Matsuyama (a1), M. Isomura (a1), N. Nakamura (a1), H. Haku (a1), M. Nishikuni (a1), H. Nishiwaki (a1) and S. Tsuda (a1)...

Abstract

We have obtained the world's highest total area conversion efficiency of 11.1% for a 100cm2 integrated-type single-junction a-Si solar cell submodule. This was achieved by the development of various advanced technologies, such as a new ultra-thin i/n interface layer and a new laser patterning method using an ablation phenomenon.

To acheive further improvement in the conversion efficiency of a-Si based solar cells, we focus on polycrystalline silicon (poly-Si) thin-film for a-Si/poly-Si tandem solar cells. As far as material technology is concerned, we have used a new solid phase crystallization (SPC) method from amorphous silicon (a-Si) films deposited by plasma-CVD. The maximum mobility of 623 cm2/V.s was achieved on textured substrates at a carrier concentration of 3.0 × 1015 cm-3. This film has been applied to the active layer of poly-Si solar cells on metal substrates and a conversion efficiency of 6.2% has been obtained with poly-Si film of 12 μm thickness made by SPC at 600°C.

In the field of device technology, we have developed new artificially constructed junction (ACJ) solar cells using p-type a-Si/i-type a-Si/n-type crystalline silicon (c-Si). We call this a HIT (Heterojunction with Intrinsic Ihin-layer) structure, and we have achieved a conversion efficiency of 18.1% for this type of solar cells. This is the highest reported value for a cell with a junction fabricated at low temperature (∼ 120°C).

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A More Than 18% Efficiency Hit Structure a-Si/c-Si Solar Cell Using Artificially Constructed Junction (ACJ)

  • Y. Kuwano (a1), S. Nakano (a1), M. Tanaka (a1), T. Takahama (a1), T. Matsuyama (a1), M. Isomura (a1), N. Nakamura (a1), H. Haku (a1), M. Nishikuni (a1), H. Nishiwaki (a1) and S. Tsuda (a1)...

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