A METHOD FOR THE MANUFACTURE OF A SILICON POLYTYPE MATERIAL

摘要

A method of manufacturing a macroporous silicon polytype material comprising the steps of a) mixing a nanopowder consisting of a silicon compound with a nanopowder consisting of a metal able to reduce the silicon compound to silicon to form a mixture, b) heating the mixture in a gas atmosphere consisting of an inert gas optionally with an proportion of a reducing gas for the silicon compound at an elevated temperature in the range from 500°C to 1000°C for a period of several hours to reduce the silicon compound to silicon, and c) subsequently treating the resultant product in an acid to remove any excess metal and metal compound resulting from step b) and leave a macroporous silicon polytype material. A macroporous silicon polytype material with an almost direct bandgap is also described and claimed.