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Sci Rep. 2018 Jan 31;8(1):1991. doi: 10.1038/s41598-018-20494-y.

Black silicon significantly enhances phosphorus diffusion gettering.

Author information

1
Aalto University, Department of Electronics and Nanoengineering, Espoo, 02150, Finland. toni.pasanen@aalto.fi.
2
Aalto University, Department of Electronics and Nanoengineering, Espoo, 02150, Finland.
3
Fraunhofer Institute for Solar Energy Systems, Freiburg, 79110, Germany.
4
University of Freiburg, Department of Sustainable Systems Engineering, Freiburg, 79110, Germany.

Abstract

Black silicon (b-Si) is currently being adopted by several fields of technology, and its potential has already been demonstrated in various applications. We show here that the increased surface area of b-Si, which has generally been considered as a drawback e.g. in applications that require efficient surface passivation, can be used as an advantage: it enhances gettering of deleterious metal impurities. We demonstrate experimentally that interstitial iron concentration in intentionally contaminated silicon wafers reduces from 1.7 × 1013 cm-3 to less than 1010 cm-3 via b-Si gettering coupled with phosphorus diffusion from a POCl3 source. Simultaneously, the minority carrier lifetime increases from less than 2 μs of a contaminated wafer to more than 1.5 ms. A series of different low temperature anneals suggests segregation into the phosphorus-doped layer to be the main gettering mechanism, a notion which paves the way of adopting these results into predictive process simulators. This conclusion is supported by simulations which show that the b-Si needles are entirely heavily-doped with phosphorus after a typical POCl3 diffusion process, promoting iron segregation. Potential benefits of enhanced gettering by b-Si include the possibility to use lower quality silicon in high-efficiency photovoltaic devices.

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